#archived-dots | Official Unity Discord | Page 219

remote crater May 12, 2021, 11:57 AM

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Ok Mr.K, you are a wise one who has answered secrets of the Universe before, I will take your advice and try and learn how to set a tag. I believe God invented Google for that. Thank you God's assistant.

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Appologies. Been binge watching Mitch Hedberg on youtube.

karmic basin May 12, 2021, 12:09 PM

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~~Yes you .AddComponentData, not Set because no values in the struct, it's just a tag~~

remote crater May 12, 2021, 12:10 PM

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ty

karmic basin May 12, 2021, 12:10 PM

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You do it from Entity Manager, or ECB,...

remote crater May 12, 2021, 12:10 PM

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GameBoardModel.entityManager.AddComponentData<DisableRendering>(GameBoardModel.playerEntity, new Unity.Rendering.DisableRendering());

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This probably will work, just gotta find the right place to put it. I think UNITY is picky due to order of operations and such, yet I don't want it in an update wasting a loop if only boolean checked to run once.

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Thanks muchly.

karmic basin May 12, 2021, 12:11 PM

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karmic basin ~~Yes you .AddComponentData, not Set because no values in the struct, it's just ...

Actually forget this sentence, that's misleading :p

remote crater May 12, 2021, 12:19 PM

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Ok, I think I set it disabled, but it still shows. I'm in the entity debugger. Is there anyway to see tags applied?

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It said disabled... hmmm

karmic basin May 12, 2021, 12:35 PM

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@remote crater should be AddComponent() because it's a tag, sorry

remote crater May 12, 2021, 12:38 PM

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oooh cool

karmic basin May 12, 2021, 12:50 PM

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quick example

pliant pike May 12, 2021, 12:52 PM

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if you get the entity's in a nativearray you can just do EntityManager.AddComponent(nativearry<Entity>()) outside a job

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that's probably the most efficient way

karmic basin May 12, 2021, 12:52 PM

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Yeah many ways to add components

wary anchor May 12, 2021, 1:01 PM

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Okay well I got the same Time getting deleted error in 2020.3.7f1 now as I was in the 2021 versions I was using before, not sure what's throwing this but it's definitely happening when I open my pause menu, but only sporadically.

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and I can't use the entity debugger after the exception is thrown because that throws a load more (UI related) presumably because of the missing TimeSingleton component

pliant pike May 12, 2021, 1:03 PM

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how are you pausing things?

wary anchor May 12, 2021, 1:07 PM

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with this TimeSystem: https://gdl.space/upicacexoh.cs

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There's an InGameMenuController that calls SetGamePaused

pliant pike May 12, 2021, 1:11 PM

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interesting so its not an internal unity thing

wary anchor May 12, 2021, 1:11 PM

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It happens only very infrequently

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I'm sure I'm at fault, I just can't work out where!

pliant pike May 12, 2021, 1:17 PM

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looks pretty much like how I would do it I'm guessing its using a Singleton with requireforupdate in the running sytems?

wary anchor May 12, 2021, 1:17 PM

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yes

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Trying to reproduce the bug and I can't, I wish I could nail down exactly when it happens

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I have a log of when it happened in a build, but that's not helpful either. I'll check the editor logs for this current session

pliant pike May 12, 2021, 1:19 PM

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sounds like something is using something a singleton in a way it shouldn't

wary anchor May 12, 2021, 1:20 PM

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lol 85 mb editor log full of NREs related to this

pliant pike May 12, 2021, 1:22 PM

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my guess is it's something to do with get_TimeSingleton

wary anchor May 12, 2021, 1:26 PM

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Mmm so one other time it happened in this session and it wasn't the TimeSingleton - it seems to have failed on get_ one of mine (which then had knockon effects, looks like the entire Player was not present, weirdly

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Well, I just got it after disabling burst as well so let's see what the logs say now 😐

gusty comet May 12, 2021, 1:36 PM

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which one i need for converting a prefab thats in memory/variable? https://i.imgur.com/FhipBj2.png

Imgur

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oh thats not an enum

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can i just make new class instance and not change anything? in these settings

wary anchor May 12, 2021, 1:57 PM

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I'm at a loss with this, with full strack traces on, it still gives me no idea where to look to root out the problem. I'll have to search for every single instance of DestroyEntity and work out if I've done something silly perhaps when changing the order of system execution.

wary anchor May 12, 2021, 2:50 PM

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Is this warning from burst helpful to tracking down the problem? I've not seen it before but it doesn't appear to point me to anywhere in my code 😦 https://gdl.space/qahaqoreli.sql

pliant pike May 12, 2021, 3:55 PM

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I'd report that as a bug to be honest @wary anchor , even if it's not necessarily a bug, the fact it isn't reporting to you clearly where the bug means it is a bug

wary anchor May 12, 2021, 3:56 PM

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Yeah I probably should - I'm in the process of tracking down the exact commit where the errors start in the hope of finding the issue that way. Once I have it found it'll be easier to put together something useful - and I have to find the error and fix it or my entire project is fubar!

nova adder May 12, 2021, 6:37 PM

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after 3 days, i recreated the math for a 2D Blend Tree in dots.....send help

safe lintel May 12, 2021, 6:56 PM

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hoping the next release of dots also includes the next animation package, that has statemachines. because it feels like a waste of time trying to implement that stuff in either node graphs or mainthread unbursted systems

remote crater May 12, 2021, 7:07 PM

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entityManager.AddComponent<DisableRendering>(playerEntity); //did not seem to make it not render...

nova adder May 12, 2021, 7:09 PM

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safe lintel hoping the next release of dots also includes the next animation package, that h...

that's what i'm working on right now. i recreated the 2DBlendTree and am currently working on changing states and clips using ECS

safe lintel May 12, 2021, 7:46 PM

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yeah made my own blend trees with bool overrides for clip interrupting as well but just felt like a complete waste of time given statemachines should theoretically be right around the corner. if you look at their code they have a framework for it in place already, just no examples, and the visual scripting ui is in the process of being merged with their compositor package.

hollow jolt May 12, 2021, 8:23 PM

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is there a way to use List.Insert with IJobParallelFor for NativeList ? All i can see is Add(...)

ocean tundra May 12, 2021, 8:27 PM

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@hollow jolt Native list dosnt even have insert

hollow jolt May 12, 2021, 8:27 PM

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yes im aware

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im looking for a similar functionality

ocean tundra May 12, 2021, 8:28 PM

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oh i see

hollow jolt May 12, 2021, 8:28 PM

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how to add_item_at_index >

ocean tundra May 12, 2021, 8:28 PM

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what is index? is it actually a key that maps to something else?

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you could try a NativeHashMap

hollow jolt May 12, 2021, 8:29 PM

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hmmm

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it has to keep the indexing of the upper values + 1

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when using add At

ocean tundra May 12, 2021, 8:30 PM

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you could move index into the value as well

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then do a sort

hollow jolt May 12, 2021, 8:30 PM

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with hash map ?

ocean tundra May 12, 2021, 8:30 PM

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oh no sorry the move index idea is still with a native list

hollow jolt May 12, 2021, 8:31 PM

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so i add ( push ) then i sort ?

ocean tundra May 12, 2021, 8:31 PM

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that could work

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what are you actually trying to do?

hollow jolt May 12, 2021, 8:31 PM

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porting some code into ecs

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https://github.com/Tvtig/UnityLightsaber/blob/d3635f5dbc568356923918ad3aca30b7b4268c72/Assets/Scripts/SlicesMetadata.cs#L227

ocean tundra May 12, 2021, 8:31 PM

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the issue with these collections is they are all aiming to support parallel code

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aah some mesh stuff

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yea i would break that up, so instead of 4 lists, 1 list of struct (Vertex, Uv,Normal,Triangle, Index)

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then a job that runs after to sort then break up into the 4 mesh lists

hollow jolt May 12, 2021, 8:38 PM

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was hoping to solve it in 1 , but ill try multiple jobs

ocean tundra May 12, 2021, 8:49 PM

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you could probably do it all in 1 big job

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i just like smaller jobs for maintainability

pliant pike May 12, 2021, 8:50 PM

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small jobs are sometimes more efficient also... depending on what they are doing

vagrant lotus May 13, 2021, 12:18 AM

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Is it possible to have a system call destroysystem on it self

ocean tundra May 13, 2021, 12:31 AM

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havnt tried yet

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i would guess so

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isnt it world.destorysystem tho?

craggy orbit May 13, 2021, 1:24 AM

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is there a way to instantiate entities inside of the IConvertGameObjectToEntity conversion method? i'm trying to generate some more entities but i only want to do it once

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i've tried instantiating to a native array with the entity from conversionSystem.GetPrimaryEntity but it doesn't seem to work. is there a specific allocator i should be using other than Temp?

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i keep getting this error

DuplicateEntityGuidException: Found 1 EntityGuid components that are shared by more than one Entity
guid = 28788:ffffdad4:00000000, count = 153, obj = ENV_Vector Field Anchor (UnityEngine.GameObject)

coarse turtle May 13, 2021, 1:33 AM

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craggy orbit is there a way to instantiate entities inside of the IConvertGameObjectToEntity ...

conversionSystem.CreateAdditionalEntity() generates a new entity for you when converted

craggy orbit May 13, 2021, 1:45 AM

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im not getting the error anymore, but it's still not working. any ideas? this is how im trying to create the extra entities

NativeArray<Entity> anchors = new NativeArray<Entity>(intSize.x * intSize.y, Allocator.Temp);
conversionSystem.CreateAdditionalEntity(anchorPrefab, anchors);

hollow jolt May 13, 2021, 1:47 AM

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ocean tundra yea i would break that up, so instead of 4 lists, 1 list of struct (Vertex, Uv,N...

so basically:

void Insert<T>( NativeList<T> list, int index, T value ) where T : struct
{
    list.Add( default( T ) );
    for( var i = list.Length - 1; i > index; -- i )
        list[ i ] = list[ i - 1 ];
    list[ index ] = value;
}

ocean tundra May 13, 2021, 1:48 AM

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ummm no clue what that is

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😛

hollow jolt May 13, 2021, 1:48 AM

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ocean tundra <@!226789193022570496> Native list dosnt even have insert

that

ocean tundra May 13, 2021, 1:48 AM

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hmmm i see

hollow jolt May 13, 2021, 1:48 AM

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not tested yet , but i gonna try to run this parallel jobs

ocean tundra May 13, 2021, 1:49 AM

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nooo

hollow jolt May 13, 2021, 1:49 AM

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y ?

ocean tundra May 13, 2021, 1:49 AM

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that wont work in parallel

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if 2 jobs access the same list to write

hollow jolt May 13, 2021, 1:49 AM

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Parallel for each

ocean tundra May 13, 2021, 1:49 AM

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if they have their own list each it should be ok

hollow jolt May 13, 2021, 1:49 AM

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IJobParallelFor -> Execute(int i)

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NativeList should work with it , isn't that the case ?

coarse turtle May 13, 2021, 1:51 AM

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craggy orbit im not getting the error anymore, but it's still not working. any ideas? this ...

No idea what you mean, what's not working exactly?

craggy orbit May 13, 2021, 1:51 AM

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it's not creating more entities

ocean tundra May 13, 2021, 1:51 AM

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pretty sure the safty system will throw up at you, execute(i) should only access the index of i

hollow jolt May 13, 2021, 1:51 AM

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eh ? so we can't add to NativeList per Execute i ?

coarse turtle May 13, 2021, 1:51 AM

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craggy orbit it's not creating more entities

Okay and what's your setup? Are you converting the gameObject on runtime? Are you using a subscene?

ocean tundra May 13, 2021, 1:52 AM

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you would use the parallel version to add to the same list from many concurrent jobs

craggy orbit May 13, 2021, 1:52 AM

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i'm converting a gameobject within a subscene. the objects im trying to instantiate are prefabs referenced inside the IConvertGameObjectToEntity

hollow jolt May 13, 2021, 1:52 AM

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ocean tundra you would use the parallel version to add to the same list from many concurrent ...

[NativeDisableParallelForRestriction] ?

ocean tundra May 13, 2021, 1:52 AM

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https://docs.unity3d.com/Packages/com.unity.collections@0.15/api/Unity.Collections.NativeList-1.html#Unity_Collections_NativeList_1_AsParallelWriter

craggy orbit May 13, 2021, 1:53 AM

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aha!

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they were in a different section in the Entity Debugger

ocean tundra May 13, 2021, 1:54 AM

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@hollow jolt no that will turn off the safty checks, and what happens in this example:
2 jobs both with 10 items each both running at the same time
job 1 adds 1, 2, 3, 4,
Job 2 adds 1 ,2, 5,6

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sorry add should be inserts at

hollow jolt May 13, 2021, 1:55 AM

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but you can use add normally can't u ?

ocean tundra May 13, 2021, 1:55 AM

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on the parallel writer version yes

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OR if your job is only 1 'thread'

hollow jolt May 13, 2021, 1:55 AM

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how do i use parallel writer ?

ocean tundra May 13, 2021, 1:56 AM

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this is Schedule vs ScheduleParallel

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on entities.foreach (if youve used that)

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just call asParallelWriter on your list

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and use the result to add too

hollow jolt May 13, 2021, 1:56 AM

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list.AsParalleWriter.Add ( ? )

ocean tundra May 13, 2021, 1:56 AM

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But you cant read or insert at pos

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var listWriter = list.ASParallelWriter()

inside job
listWriter.Add....

hollow jolt May 13, 2021, 1:57 AM

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ah i c

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well guess ill just pile them up and sort after the job is complete

ocean tundra May 13, 2021, 1:58 AM

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unless you can make 100% sure each index is always unique

hollow jolt May 13, 2021, 1:58 AM

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its writing like 0,1,2 , 0,1,2 , 0,1,2 ... ( inserts in pairs of 3 )

ocean tundra May 13, 2021, 1:58 AM

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as in each job i maps to a single index in your lists/arrays

craggy orbit May 13, 2021, 3:10 AM

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regarding my earlier issue with creating a bunch of entities on conversion: all of the instantiated entities have a Prefab tag on them, which afaik treats them as not really existing in the scene. i've tried removing the component but it's not working. it also doesn't convert the prefab entity before instantiating more, so i have to add the components myself, which im pretty sure im not supposed to do.
here's the instantiation code

NativeArray<Entity> anchors = new NativeArray<Entity>(intSize.x * intSize.y, Allocator.Temp);
conversionSystem.CreateAdditionalEntity(anchorPrefab, anchors);
dstManager.RemoveComponent<Prefab>(anchors);
```and the full script <https://pastebin.com/xJXZ2C5e>

ocean tundra May 13, 2021, 3:55 AM

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@craggy orbit is the main IConvert a prefab?

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ok so

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CreateAdditionEntity just creates a empty entity linked to the target you give it

craggy orbit May 13, 2021, 3:55 AM

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the VectorFieldAnchorAuthoring is a prefab

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so CreateAdditionalEntity doesn't instantiate from a prefab like i'd hoped?

ocean tundra May 13, 2021, 3:56 AM

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Creates an additional entity in the destination world. The entity is associated with the given object. New entities should be created using this method since it ensures that the resulting entities have all data required for conversion correctly set up.

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no

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that association is for things like livelink i belive

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so normally i would pass 'this' into the createadd... method

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then setup the new entity

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so to confirm your problem, you have a prefab and want to create X of them during conversion?

craggy orbit May 13, 2021, 4:00 AM

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yes. i've got a base object VectorFieldColliderAnchorAuthoring with a prefab field VectorFieldAnchorAuthoring and i'd like to create X prefabs converted to entities

ocean tundra May 13, 2021, 4:02 AM

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hmmm

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so

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the ability do simply do what you want does seem to be lacking

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but i think i know a way 😛

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first you cant use IConvert

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need to write a custom conversion system

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maybe 2

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First system, loops over all your VectorFieldColliderAnchorAuthoring GO entities, and creates more entities in the INPUT world

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those entities will have your instance data (eg X Y Z) and a link to your prefab

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that system has to update in 'GameObjectDeclareReferencedObjectsGroup'

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(sorry had the wrong group)

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and i THINK that may work, destionation entitys are created after that group runs

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wait you need to be creating your source prefab sorry, not adding a link

craggy orbit May 13, 2021, 4:08 AM

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hm ok... it sucks that the functionality doesn't already exist, but thanks for pointing me in the right direction!

ocean tundra May 13, 2021, 4:08 AM

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i hope its the right direction 😛

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https://docs.unity3d.com/Packages/com.unity.entities@0.17/manual/conversion.html

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all the info

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hmm they say to treat the input world as read only

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what if you do DstEntityManager.Init... with GetPrimaryEntity(Prefab)

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it wont be setup for livelink and things

craggy orbit May 13, 2021, 6:43 AM

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i took a little break before switching to a conversion system, but it took only a few minutes! i was able to practically copy and paste from my old authoring component to the conversion system. the only "big" change i made was the entity creation

NativeArray<Entity> anchors = new NativeArray<Entity>(intSize.x * intSize.y, Allocator.Temp);
DstEntityManager.Instantiate(GetPrimaryEntity(input.anchorPrefab), anchors);

hollow jolt May 13, 2021, 9:18 AM

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how to clone an entity ?

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( and all its components )

opal lynx May 13, 2021, 10:25 AM

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hollow jolt how to clone an entity ?

Entity newEntity = entityManager.Instantiate(entityThatYouAlreadyHave);

You have to do this on Main Thread
which means

on Monobehaviour
or
on System in OnUpdate in ForEach.Run()

opal lynx May 13, 2021, 10:33 AM

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hollow jolt ( and all its components )

and.. I guess even all components are included, the each value of components should be set after that

gusty comet May 13, 2021, 10:33 AM

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Is there way to use GameobjectConversionUtility and set the entities to disabled at start/during the process?

opal lynx May 13, 2021, 10:34 AM

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(some stupid saying)

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(some stupid saying)

gusty comet May 13, 2021, 10:36 AM

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there is Disabled Component but i dont know

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how to add it

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during conversion utility

opal lynx May 13, 2021, 10:38 AM

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I am sorry.. 😅 I didn't know
I am testing it now

gusty comet May 13, 2021, 10:38 AM

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oh

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disabling the prefab does the job

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Lol!

opal lynx May 13, 2021, 10:44 AM

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gusty comet May 13, 2021, 10:45 AM

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yeah i know

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its better to just disable the prefab though

opal lynx May 13, 2021, 10:45 AM

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That's better 👍

wary anchor May 13, 2021, 1:07 PM

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I recently changed some systems to Schedule that were Run. They're writing work to the EndSimulationGroupCommandBufferSystem and now I've realised a problem I'm not sure how best to get around: at the end of the game I am resetting some public NativeArrays but they were being used by the scheduled job so of course I now get a
The previously scheduled job UpAxisSystem:OnUpdate_LambdaJob0 reads from the --NativeArray--. You must call JobHandle.Complete() on the job before you can deallocate the NativeArray safely.

I can't just move the main menu systems to a later systemgroup as they use many of the same systems as the main game (it's all in one scene). How would you handle this situation?

bright sentinel May 13, 2021, 1:30 PM

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wary anchor I recently changed some systems to Schedule that were Run. They're writing work ...

Well, it sounds like this is just something that happens at the end of the game, right? Meaning it happens once in that frame, and very rarely. So you could just complete the dependency manually here?

wary anchor May 13, 2021, 1:31 PM

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Okay, how do you complete the dependencies of other jobs? Or would I have to add that into each one?

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I was thinking about delaying the loading process until the start of the next frame / end of this one to get around it that way

bright sentinel May 13, 2021, 1:32 PM

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You have to save them somewhere. For example ECBSystems has the AddJobHandleForProducer function that adds the jobhandles that must be completed, which it then completes before. You could have a similar pattern here.

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The ECBSystem then just saves them to a list

wary anchor May 13, 2021, 1:39 PM

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I'm sorry, I'm being really slow on this, I don't follow

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just trying to understand how it worked before I changed from run to schedule so I can see where in the loop it would be okay to overwrite the native array

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but brain still in shader mode!

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I think... if I make sure the system that calls the end of game and kicks off that set of loading systems makes sure it runs before any of the Scheduled systems, that should resolve it?

warped trail May 13, 2021, 1:48 PM

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let your system that resets native array have some public list of jobhandles

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and every system that touches that native array just add their jobs to that public list

wary anchor May 13, 2021, 1:49 PM

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k then just JobHandle.CombineDependencies then complete before resetting it yeh

warped trail May 13, 2021, 1:51 PM

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why do you need to complete if you can just schedule a job that dependant on this jobhandle?

wary anchor May 13, 2021, 1:51 PM

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because I'm recalculating the values for the array and setting it on the main thread

warped trail May 13, 2021, 1:54 PM

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in that case you can complete

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look at physics system they use this strategy to handle external dependency to nativearrays🤔

wary anchor May 13, 2021, 1:56 PM

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k Cheers will do

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Okay, so that seems to be working, but I'm adding the dependency every frame which must be wrong, Sorry I'm being ridiculously thick about this

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I suppose i can just Clear it before scheduling the job and add it after, seems like a janky hack tho

wary anchor May 13, 2021, 2:30 PM

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Oh man okay no that hasn't fixed it at all, now it goes for the first cycle then there aren't any atoms. I genuinely don't understand why this problem is occurring now. It's all really complicated and of course worked before I switched a system to Schedule - but now I've got all the loading and nativearray stuff happening before the UpAxisSystem, so it should have all the updated values in place before it schedules

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ahh unless... yeah there are some of the loading systems in a previous group, so they would be waiting until the next frame before they receive their commands.. the lading is complicated and it's several systems chained together with events driving them

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so I could put a blocking component in after the load is requested and delete it when the load is finished, and just not schedule any of the systems that use the array if that component is present

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cough or use my existing AllowSystemsToRunComponent cough fail roo

wary anchor May 13, 2021, 2:51 PM

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Well, I have no idea why it stopped working but I can reload levels fine so I'll just have to rewrite my menu code. I've been through all the diffs for the last few commits so either I didn't notice this in testing because I've been reloading levels all the time & doing shader work, or unity's decided to order the systems differently and that's somehow caused it. It's no bad thing, the menu needed refactoring anyway.

remote crater May 13, 2021, 5:55 PM

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entityManager.AddComponent<DisableRendering>(playerEntity); //did not seem to work. It is supposed to disable rendering.

karmic basin May 13, 2021, 6:00 PM

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Works for me. Do you convert your player from a gameobject ?
Do you have a "complex" hierarchy ? I think the component should be on the same level as the RenderMesh. You can double-check with the Entity debugguer. Not sure it disables all hierarchy

remote crater May 13, 2021, 7:06 PM

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Mr.K, yes I converted my player from a game object. Yes, I beleiev I have a complex hierarchy.

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It is a game object with many scripts and a child.

karmic basin May 13, 2021, 7:25 PM

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If the mesh is on the child and you convert the parent, maybe that's why

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didnt test that case

remote crater May 13, 2021, 7:56 PM

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Going to aunt's 70th, she's awesome. Be back in a few hours. God bless all of yinz.

jaunty herald May 14, 2021, 12:09 AM

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Is it possible to add an ECB to run after a scheduled job has executed?

bright sentinel May 14, 2021, 7:22 AM

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@jaunty herald Then you need to create your own ecb system for it that will run after the job is scheduled. An ECB is always a sync point, so you can't depend on it being completed, but you can complete it before the ECB runs.

vagrant lotus May 14, 2021, 7:53 AM

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public class BaseMenu : SystemBase
{
    protected override void OnUpdate()
    {
        if (!isActive)
            return;

        var query = EntityManager.CreateEntityQuery(
            ComponentType.ReadOnly<Translation>(), 
            ComponentType.ReadOnly<PlayerRotationData>(), 
            ComponentType.ReadOnly<PlayerTag>());
        var origin = query.GetSingleton<Translation>().Value;
        var pivot = query.GetSingleton<PlayerRotationData>().rotation;
        query.Dispose();

        foreach (var element in elements)
        {
            var config = EntityManager.GetComponentData<UserConfigData>(element);

            var position = origin + math.mul(quaternion.RotateY(pivot.y), config.offset);
            var turned = quaternion.RotateY(pivot.y + config.orientation.y);
            var pitched = math.mul(turned, quaternion.RotateX(config.orientation.x));
            var rotated = math.mul(pitched, quaternion.RotateZ(config.orientation.z));

            if (EntityManager.HasComponent<UserRenderData>(element))
                EntityManager.GetComponentObject<UserRenderData>(element).textMeshPro.transform.SetPositionAndRotation(position, rotated);
            EntityManager.SetComponentData(element, new Translation { Value = position });
            EntityManager.SetComponentData(element, new Rotation { Value = rotated });
        }
    }

    protected override void OnDestroy()
    {
        foreach (var element in elements)
            if (EntityManager.HasComponent<UserRenderData>(element))
            {
                TextMeshPro textMeshPro;
                if ((textMeshPro = EntityManager.GetComponentObject<UserRenderData>(element).textMeshPro) != null)
                    GameObject.Destroy(textMeshPro.gameObject);
            }

        EntityManager.DestroyEntity(elements);
        elements.Dispose();
    }
}

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[DisableAutoCreation]
public class MainMenu : BaseMenu
{
    protected override void OnCreate()
    {
        var buttonMesh = ResourceLoader.active.LoadMesh("Mesh/Button");
        var buttonMaterial = ResourceLoader.active.LoadMaterial("Material/Button");
        var meshData = new MeshData
        {
            render = buttonMesh,
            material = buttonMaterial,
            collider = ResourceLoader.active.GetCollider(buttonMesh)
        };

        elements = new NativeList<Entity>(3, Allocator.Persistent);
        elements.Add(AddButton(
            EntityManager,
            new float3(-1.1f, -1f, 2f), 0f,
            meshData, ToStartMenu,
            2.5f, "Start"));
        elements.Add(AddButton(
            EntityManager,
            new float3(0f, -1f, 2f), 0f,
            meshData, ToSettingMenu,
            2.5f, "Settings"));
        elements.Add(AddButton(
            EntityManager,
            new float3(1.1f, -1f, 2f), 0f,
            meshData, ToExit,
            2.5f, "Exit"));

        Show();
    }
}

#

[UpdateAfter(typeof(PlayerSystem))]
public class UserSystem : SystemBase
{
    private BaseMenu current;

    protected override void OnCreate()
    {
        current = World.CreateSystem<MainMenu>();
    }
}

#

my problem is

#

after i called CreateSystem in UserSystem

#

the OnCreate function in MainMenu gets called

#

but the OnUpdate function does not get called

#

and MainMenu does not show up as a system in the EntityDebugger

#

could anyone shed me some light on this problem i have?

#

I could directly call function in MainMenu, which means the class instance does exist
Update: not solved but CreateSystem<BaseMenu>() does work properly

#

p.s. ping me

#

thx in advance

opal lynx May 14, 2021, 8:11 AM

#

vagrant lotus could anyone shed me some light on this problem i have?

I am newbie but
Can you try
current.Enabled = true;
after Created MainMenu?

vagrant lotus May 14, 2021, 8:12 AM

#

Hmmm, let me fire up unity

vagrant lotus May 14, 2021, 8:15 AM

#

opal lynx I am newbie but Can you try current.Enabled = true; after Created MainMenu?

sorry report that its the same as before

#

Update: not solved but CreateSystem<BaseMenu>() does work properly

opal lynx May 14, 2021, 8:19 AM

#

What is isActive in the OnUpdate?

vagrant lotus May 14, 2021, 8:20 AM

#

opal lynx What is isActive in the OnUpdate?

it does not do stuff to the system, it just disable a group of entities (to show or hide the menu)

#

my theory is ecs does not work with subclass

#

but the compiler does not know it

opal lynx May 14, 2021, 8:22 AM

#

before return 😅
just for check
Debug.Log("Code stopped");

vagrant lotus May 14, 2021, 8:23 AM

#

opal lynx before return 😅 just for check Debug.Log("Code stopped");

on which code snippet

opal lynx May 14, 2021, 8:23 AM

#

at BaseMenu

OnUpdate

after
if (!isActive)

#

so just to make sure
the ecs can't run Update

vagrant lotus May 14, 2021, 8:24 AM

#

yeah, i did Debug.Log("hi")

#

nothing showed up

#

let me test this with CreateSystem<BaseMenu>()

#

Update: OnUpdate does work with BaseMenu

#

just not with subclass MainMenu

#

Remarks: problem not solved (for any helper out there)

#

Thx for your effort, as always

opal lynx May 14, 2021, 8:30 AM

#

use
private MainMenu current;

and make OnUpdate, there
and call base.OnUpdate

#

so make
current = create MainMenu

vagrant lotus May 14, 2021, 8:31 AM

#

let me try

#

OnUpdate doesnt work, but MainMenu showed up as BaseMenu in EntityDebugger

#

@opal lynx

opal lynx May 14, 2021, 8:37 AM

#

#

#

mine works

#

I made MainMenu
and BaseMenu Updates

vagrant lotus May 14, 2021, 8:37 AM

#

what version of unity

opal lynx May 14, 2021, 8:38 AM

#

2020.3.6f1

vagrant lotus May 14, 2021, 8:38 AM

#

ah

#

let me get that version

#

i heard they started to have compatibility issue with 2021Unity

#

and advised people to switch to 2020LTS

opal lynx May 14, 2021, 8:40 AM

#

#

also it works, too

#

it still Updates BaseMenu's OnUpdate

vagrant lotus May 14, 2021, 8:42 AM

#

opal lynx it still Updates BaseMenu's OnUpdate

im gonna report back as soon as 2020LTS is installed

opal lynx May 14, 2021, 8:43 AM

#

What version were you using?

vagrant lotus May 14, 2021, 8:43 AM

#

2021.1.6f1

#

https://forum.unity.com/threads/notice-on-dots-compatibility-with-unity-2021-1.1091800/

Unity Forum

Unity - Notice on DOTS compatibility with Unity 2021.1

Hi!

With the release of Unity 2021.1, DOTS is at a crossroads in terms of compatibility with the currently available Unity versions.

While certain...

#

fingercross my code works with 2020

opal lynx May 14, 2021, 8:44 AM

#

vagrant lotus 2021.1.6f1

oh... then some people was right 😅

I heard the other people still can use ecs in 2021 even Unity said not working

vagrant lotus May 14, 2021, 8:44 AM

#

opal lynx oh... then some people was right 😅 I heard the other people still can use ecs...

i guess i was lucky before

vagrant lotus May 14, 2021, 8:46 AM

#

opal lynx

did you disable auto creation on BaseMenu?

opal lynx May 14, 2021, 8:48 AM

#

vagrant lotus did you disable auto creation on BaseMenu?

Oops... I was wrong

#

It doesn't work

vagrant lotus May 14, 2021, 8:48 AM

#

oh no

#

bad news

#

i cant downgrade

opal lynx May 14, 2021, 8:50 AM

#

That's okay

#

I found what you to do

vagrant lotus May 14, 2021, 8:51 AM

#

opal lynx I found what you to do

?

opal lynx May 14, 2021, 8:51 AM

#

vagrant lotus May 14, 2021, 8:51 AM

#

oh wow

opal lynx May 14, 2021, 8:51 AM

#

it works

vagrant lotus May 14, 2021, 8:51 AM

#

you are awesome

#

what search terms did you use to find the answer

opal lynx May 14, 2021, 8:52 AM

#

I can't tell you because it will seems like an advertiser here LOL

vagrant lotus May 14, 2021, 8:52 AM

#

i want to know, but you can keep your secret

#

thanks

gusty comet May 14, 2021, 10:05 AM

#

is there any way to set position of entity

            GameObjectConversionSettings conversionSettings = new GameObjectConversionSettings();
            conversionSettings.DestinationWorld = World.DefaultGameObjectInjectionWorld;
            conversionSettings.

            for (int i = 0; i < 3; i++)
                God.galaxyMonos[g].galaxyPopulation[i] = entityManager.Instantiate(
                GameObjectConversionUtility.ConvertGameObjectHierarchy(populationHandle.Result.prefabs[i], conversionSettings));
        }

#

i know i can SetComponentData

#

as last resort

#

but i thought there would be some parameter

#

for that

amber flicker May 14, 2021, 10:31 AM

#

gusty comet is there any way to set position of entity ```cs GameObjectConversio...

I don't think there's an overload in Instantiate, but if there was it would only call SetComponent anyway.

gusty comet May 14, 2021, 10:34 AM

#

i see

gusty comet May 14, 2021, 12:25 PM

#

what even is AmbientProbeTag ? its being added automaticaly with gameobjectconversionutility & instantiate

karmic basin May 14, 2021, 12:27 PM

#

It's in the Hybrid Renderer namespace, probably for lighting calculations

#

dunno if probe lights are useful in URP, but i guess they sure are for HDRP

#

I'm not a lighting guru :p

gusty comet May 14, 2021, 12:30 PM

#

probe light is just reflection support irc

#

so indirect light in other words

karmic basin May 14, 2021, 12:30 PM

#

I guess its heavy ?

gusty comet May 14, 2021, 12:30 PM

#

so youre saying that ambientprobetag == converting mesh renderer that had probes not turned off?

#

or you mean that theres a light probe component

#

before conversion

karmic basin May 14, 2021, 12:32 PM

#

I'm not asserting anything :p not my field

gusty comet May 14, 2021, 12:32 PM

#

oh ok

#

do you know why objects with render mesh are in same group? they have different mesh

#

maybe they just did it to not clunk the UI idk

#

theres also this weird tag as well as some other:
https://i.imgur.com/22zdNYX.png

Imgur

karmic basin May 14, 2021, 12:36 PM

#

You mean why the RenderMesh is a SharedComponent ?

#

Yeah I'll let more knowledgeable people on this field answer. But basically the Hybrid Renderer will add anything needed for your entities to be rendered by the Unity rendering pipeline yo uchose

#

You're trying to get rid of unnecessry things ?

full epoch May 14, 2021, 12:40 PM

#

good news - timjohansson just wrote on netcode forum : "Yes, you can only have ghostfields in 128 different component types right now. The code is changing in netcode 0.8" - so although next version of the netcode is 0.7 they are planning ahead - so we do not have to worry about dots - netcode future 🙂

hollow sorrel May 14, 2021, 12:42 PM

#

yeah nothing ever goes wrong with unity planning PEPW

gusty comet May 14, 2021, 12:52 PM

#

karmic basin You're trying to get rid of unnecessry things ?

im trying to remove unneccessary tags/components

#

that create during gameobject conversin systems

#

in order to decraese amount of chunks

karmic basin May 14, 2021, 12:54 PM

#

Well I would let the Hybrid Renderer do its thing, and focus optimization elsewhere

#

COpyTransformFromPrimaryEntityTag is surely used by the conversion system to set the transform of the entity in the destination world (?) If I would guess from the name (and you can search in Library/PackageCache to really see what happens)

#

I would be afraid to see things failing if I remove smthg I don't fully grasp

bright sentinel May 14, 2021, 1:30 PM

#

@gusty comet @karmic basin The reason why RenderMeshes have different chunks for each mesh is because it's a shared component. Shared components group entities that have the same value. So that means all entities of the same archetype with the same mesh are in chunks together. This is to optimize rendering multiple of the same object. The reason that it's designed like this is because ECS was always designed for having many of the same archetype.

gusty comet May 14, 2021, 1:34 PM

#

i know that

#

but it was displayed in one group in editor

distant summit May 14, 2021, 4:22 PM

#

It was great to see a huge interest in the DOTS workshop last week. With the support of Unity team, it was nice to see the current state of production-ready and experimental features. Furthermore, it was interesting to see DOTS in action highlighting another part of this technology stack to bring more and more performance.
The recording and repo of this workshop is recently released, you can check here:
https://zt0b1t1jhdi.typeform.com/to/gJCRHuTa

Typeform

Unleash the Power of Dots General

Turn data collection into an experience with Typeform. Create beautiful online forms, surveys, quizzes, and so much more. Try it for FREE.

slim nebula May 14, 2021, 5:20 PM

#

oh yay that was the thing I missed wasn't it

#

cool

#

thanks

slim nebula May 14, 2021, 5:38 PM

#

this looks really cool

#

https://github.com/Dreaming381/Latios-Framework/blob/master/Documentation~/Psyshock Physics/README.md

GitHub

Dreaming381/Latios-Framework

A Unity DOTS framework for my personal projects. Contribute to Dreaming381/Latios-Framework development by creating an account on GitHub.

#

Unity.Physics first and foremost tries to be an out-of-the-box solution and then slowly is working on exposing flexibility.

In constrast, Psyshock tries to be a “Build your own solution” framework and is being designed inside-out. Over time, it will eventually achieve an out-of-the-box status, but that is not the focus. The focus is flexibility with the luxury of drop-in optimized and accurate algorithms and authoring tools.```

#

this is how I want a physics engine to be

gusty comet May 14, 2021, 6:28 PM

#

can anyone tell me why there are two archetypes? all entities that are inside them are made in the same manner and had same components
https://i.imgur.com/gM55iuc.png
I used this

GameObjectConversionUtility.ConvertGameObjectHierarchy(populationHandle.Result.prefabs[i], conversionSettings);

Imgur

#

i have some ideas why this could happen but generally a person would think there would be just one archetype.

#

unique components/tags i spotted:

copyTransformFromPrimaryEntityTag
nonuniformscale
translation

bright sentinel May 14, 2021, 6:40 PM

#

slim nebula this looks really cool

Super interesting! I'm personally not going to use it because it is barebones, but I really appreciate the points he raises. Especially having immutable colliders and the performance issues.

slim nebula May 14, 2021, 6:41 PM

#

ye looks super young but I Like the nature of it

#

it really is impossible to have an out of the box physics solution. every game has it's own requirements

bright sentinel May 14, 2021, 6:42 PM

#

gusty comet can anyone tell me why there are two archetypes? all entities that are inside th...

This is a long shot and it's something I only learned about recently, but could it be because of shared components? I have no idea how that would show up in that UI.

slim nebula May 14, 2021, 6:42 PM

#

and I like how it's more ECS oriented as far as the interface (or so he says, tho I didn't look to deep into it myself)

#

ie queries instead of the hit collectors

bright sentinel May 14, 2021, 6:42 PM

#

slim nebula and I like how it's more ECS oriented as far as the interface (or so he says, th...

Yes! Unity Physics always feels so weird to use in ECS

warped trail May 14, 2021, 6:47 PM

#

@gusty cometyou have nonuniformscale because your gameobject is scaled

#

why you dont't want to use subscene exactly, instead of converting at runtime?🤔

gusty comet May 14, 2021, 7:00 PM

#

warped trail <@456226577798135808>you have nonuniformscale because your gameobject is scaled

you mean cus its not 1,1,1, ?

warped trail May 14, 2021, 7:00 PM

#

yes

gusty comet May 14, 2021, 7:00 PM

#

yeah i assumed so too

#

but theres also this other tag

warped trail May 14, 2021, 7:06 PM

#

you can process entities before loading them to main world(offsetting them for example), and there is subsections in subscene, so you can load or unload different parts of subscene(you can load different part based on distance from player)🤔

sour atlas May 14, 2021, 8:42 PM

#

as far as i understood it this is the place to ask burst related questions too, if it isnt though please tell me :b

im not quite sure i understand JobHandle.Complete();
im following this article (https://www.raywenderlich.com/7880445-unity-job-system-and-burst-compiler-getting-started#toc-anchor-001) to get into using burst and im not quite sure what happens when calling that method. does the job get forced to complete or does it force a return early if the job isnt completed ?

raywenderlich.com

Unity Job System and Burst Compiler: Getting Started

In this tutorial, you’ll learn how to use Unity’s Job System and Burst compiler to create efficient code to simulate water filled with swimming fish.

#

furthermore if i schedule a job once in create that i dont need to run constantly (only once) wouldnt it be unnecessary overhead to check if it completed every update ? or does the compiler just ignore it after i dispose of it ?

gusty comet May 14, 2021, 8:57 PM

#

warped trail you can process entities before loading them to main world(offsetting them for e...

i know but why theres copyTransformFromPrimaryEntityTag tag?

#

and in second archetype its not there

safe lintel May 14, 2021, 9:03 PM

#

@sour atlas it does force complete the jobs associated with that jobhandle. i assume they call it in lateupdate or something after starting the job in update

sour atlas May 14, 2021, 9:04 PM

#

safe lintel <@!218382949559566336> it does force complete the jobs associated with that jobh...

yeah, they do. is there a disadvantage to forcing a job to complete ? as far as i understand it the main thread creates the worker threads and schedules the jobs appropriately so forcing them to complete kind of seems like defeating the point to me ?

safe lintel May 14, 2021, 9:08 PM

#

tbh im not sure about jobs from monobehaviour but generally you dont want to make a job in an update and immediate complete it in the same update because you can have hiccups if there are other jobs that might get force completed

sour atlas May 14, 2021, 9:08 PM

#

oh does it force all jobs to complete ?

#

id have imagined it forces all jobs the handler scheduled to complete

safe lintel May 14, 2021, 9:08 PM

#

well as I said im not sure about use from monobehaviours

sour atlas May 14, 2021, 9:08 PM

#

ah, no worries.

safe lintel May 14, 2021, 9:11 PM

#

but its easy enough to profile and see the effect of jobhandle.Complete(), worth actually doing it the "wrong" way to see the effect in action. I could potentially see it being useful in certain cases if you know you have a lot of data to process and could potentially do it faster with a parallel job with complete than doing it mainthread only

sour atlas May 14, 2021, 9:15 PM

#

yeah well thats actually kind of what im doing id assume

#

for all practical purposes i need a gradient but as a float array so i thought parralellizing that would make a lot of sense lol

warped trail May 14, 2021, 9:18 PM

#

@gusty cometI guess it has something to do with sub meshes🤔

gusty comet May 14, 2021, 9:20 PM

#

what is submesh?

#

theres just one mesh object

#

no child

#

is child what u mean

warped trail May 14, 2021, 9:28 PM

#

this component is added in ConvertToMultipleEntities(...) in RenderMeshConversionContext.cs

#

you have more than 1 material on your GO

#

thats why copyTransformFromPrimaryEntityTag is added

gusty comet May 15, 2021, 7:25 AM

#

that makes no sense

#

i see no reference to material in the name "copyTransformFromPrimaryEntityTag "

#

yeah theres 1-4 mats

#

do entities help with rendering or gpu usage anyhow?

#

or anything beside hybrid renderer

#

im also wondering if hybrid renderer v1 is improving anything or just letting GOs and entities to be rendered at same time but without improving anything

bright sentinel May 15, 2021, 7:59 AM

#

@gusty comet So for some reason, Hybrid Renderer creates a copy of your entity for each material. That may be what you're seeing.

gusty comet May 15, 2021, 8:12 AM

#

i think entities are not optimized for deactivation/deinstantiation, as doing that will trigger structural change/syncpoint

#

deactivation is a matter of adding/removing Disabled component = that changes archetype = moves entities to different chunks = syncpoint

#

according to this logic whether i deactivate or deinstantiate i will have syncpoints in every second, if i want to have some dynamic mechanism for eg stopping unseen entities from rendering

bright sentinel May 15, 2021, 8:52 AM

#

gusty comet i think entities are not optimized for deactivation/deinstantiation, as doing th...

It's not, hopefully with enabled bits that will change. But no idea when that will come

gusty comet May 15, 2021, 9:39 AM

#

are you referring to some not-yet-released feature

gusty comet May 15, 2021, 10:10 AM

#

oh well, i am in bad situation then, cause unity's camera wont disable rendering of unseen entities
OR maybe it does actually..

opal lynx May 15, 2021, 10:21 AM

#

gusty comet oh well, i am in bad situation then, cause unity's camera wont disable rendering...

How did you find that? Can you show me screenshot for that?

amber flicker May 15, 2021, 10:24 AM

#

gusty comet according to this logic whether i deactivate or deinstantiate i will have syncp...

You most likely have a syncpoint at the start and end of every frame anyway. If not now, then you probably will. These are good places for carrying out batch operations like e.g. disable rendering of a bunch of meshes.

gusty comet May 15, 2021, 10:26 AM

#

amber flicker You most likely have a syncpoint at the start and end of every frame anyway. If ...

could you elaborate? how to reach what youre saying? 😛 eg how to know if i have syncpoint there, and how to force my code to cause syncpoint in that moment

gusty comet May 15, 2021, 10:27 AM

#

opal lynx How did you find that? Can you show me screenshot for that?

if you look in direction where there are no entities the gpu usage will be smaller in Stats, which is good

amber flicker May 15, 2021, 10:29 AM

#

gusty comet if you look in direction where there are no entities the gpu usage will be small...

that's gpu culling - not rendering triangles in the frustum. Hybrid Renderer also already does camera culling based on mesh bounds. I assumed you're wanting to do some other bespoke culling on top of those?

gusty comet May 15, 2021, 10:30 AM

#

yeah i toggle lot of meshes basing on distance

amber flicker May 15, 2021, 10:31 AM

#

It's not very easy to see your sync points until you have a lot of work but the Timeline view in the profiler with Show Flow Events enabled is very useful. I believe rendering anything has a sync point - as all the transforms need to be up to date before uploading to gpu. But it's possible I'm wrong about that.

#

Are you familiar with the entity command buffers? These are buffers you use that are designed to run at dedicated sync points.

gusty comet May 15, 2021, 10:31 AM

#

i heard about them but didnt use

amber flicker May 15, 2021, 10:32 AM

#

That's how you e.g. destroy/instantiate/add/remove components at dedicated sync points.

#

The hard part for you will be how you store or evaluate which entities you want to change, without e.g. adding a tag.

#

One way is to use an ICD with a bool flag that you set and then check at a sync point. Another way is to simply queue an entity command buffer (which can be done in parallel + burst) that then executes at a sync point.

#

here we are: https://docs.unity3d.com/Packages/com.unity.entities@0.17/manual/entity_command_buffer.html

gusty comet May 15, 2021, 10:34 AM

#

oh ok thanks will look into it

hollow jolt May 15, 2021, 11:52 AM

#

how to read and modify physics* colliders ?

warped trail May 15, 2021, 12:32 PM

#

hollow jolt how to read and modify physics* colliders ?

https://github.com/Unity-Technologies/EntityComponentSystemSamples/blob/master/UnityPhysicsSamples/Assets/Demos/5. Modify/Scripts/ChangeSphereColliderRadiusAuthoring.cs

GitHub

Unity-Technologies/EntityComponentSystemSamples

Contribute to Unity-Technologies/EntityComponentSystemSamples development by creating an account on GitHub.

hollow jolt May 15, 2021, 12:33 PM

#

thanks , any idea if its possible to read raw convex hull collider data ?

deft stump May 15, 2021, 12:39 PM

#

what's the underlying code for transform.translate?
I want to put it in a job

hollow jolt May 15, 2021, 12:46 PM

#

warped trail https://github.com/Unity-Technologies/EntityComponentSystemSamples/blob/master/U...

i think i got it

unsafe
{
    var phy_collider = manager.GetComponentData<PhysicsCollider>( hit.Entity );
    //collider.ColliderPtr->GetLeaf( hit.ColliderKey , out ChildCollider leaf );
    ConvexCollider* collider = (ConvexCollider*) phy_collider.ColliderPtr;
    BlobArray.Accessor<float3> verts = collider->ConvexHull.Vertices;
    var l = verts.Length;
    var v = verts[ 0 ];
}

had to expose ConvexHull so i changed it to public

warped trail May 15, 2021, 12:46 PM

#

but be aware that entities share same colliders

#

for example if you instantiate 1k entities and change collider like in this code, you basically changing all colliders

hollow jolt May 15, 2021, 12:47 PM

#

interesting didn't notice this before , im looking for the vert data so i can slice them up and spawn 2 new colliders

warped trail May 15, 2021, 12:48 PM

#

im not sure, but if you create collider yourself you will have to manage it's memory yourself🤔

hollow jolt May 15, 2021, 12:49 PM

#

seems like convex collider makes them for us

#

ConvexCollider.Create(ConvexHullBuilder builder ...

#

that whole unsafe scope , arrow syntax which i assume are pointers and UnsafeUtility makes me wonder when my editor will start crashing

hollow jolt May 15, 2021, 1:10 PM

#

didn't take long to show me some obscure errors

bright sentinel May 15, 2021, 1:39 PM

#

deft stump what's the underlying code for transform.translate? I want to put it in a job

Logically it's just position += direction;

deft stump May 15, 2021, 1:40 PM

#

I like how simple it is

bright sentinel May 15, 2021, 1:41 PM

#

Well yeah, it's just adding two vectors, there really isn't much to a translation

deft stump May 15, 2021, 2:30 PM

#

is TransformAccessArray Persistent?

#

or temp?

deft stump May 15, 2021, 2:56 PM

#

@bright sentinel doesn't seem to work I think.
my objects are going south

#

not where I'm pointing

#

code

[BurstCompile]
public struct RegularMoverJobTransform : IJobParallelForTransform
{
    [ReadOnly]
    public NativeArray<float2> Directions;

    [ReadOnly]
    public float Speed;

    [ReadOnly]
    public float DeltaTime;

    public void Execute(int index, TransformAccess transform)
    {
        transform.position = Translate(transform.position, Directions[index] * Speed * DeltaTime);
    }
    private float3 Translate(float3 current, float2 direction)
    {
        return current + new float3(direction, 0);
    }
}

bright sentinel May 15, 2021, 3:01 PM

#

Well could be that your directions are wrong

deft stump May 15, 2021, 3:01 PM

#

Or... I should rotate it

#

just realized it now

hollow jolt May 16, 2021, 3:38 AM

#

var component_types = entity_manager.GetComponentTypes( entity );
foreach ( var comp_type in component_types )
{
  System.Type type = comp_type.GetManagedType();
  //...

Why is type.BaseType is System.ValueType and not IComponentData ? ? ? ? It result in an error when I'm trying to make a generic method like so :

  //...
  var methodInfo = entity_manager.GetType().GetMethod("GetComponentData");
  var genericMethodInfo = methodInfo.MakeGenericMethod( type );

#

That's the error I'm seeing

ArgumentException: Invalid generic arguments
Parameter name: typeArguments
System.Reflection.MonoMethod.MakeGenericMethod (System.Type[] methodInstantiation)

bright sentinel May 16, 2021, 8:05 AM

#

hollow jolt ```cs var component_types = entity_manager.GetComponentTypes( entity ); foreach ...

Because IComponentData is an interface. You can't make inheritance in structs (which are value types)

hollow jolt May 16, 2021, 8:42 AM

#

actually it was working until the look reach the Child component which isn't a IComponentData

#

( Child : ISystemStateBufferElementData, IBufferElementData )

gusty comet May 16, 2021, 10:39 AM

#

how would you use impostors with dots?

#

oh well, i guess i have to somehow convert amplify imposts to be dots compatible, or depending how it works, i may have to store impostors mesh and then just load it with dots

#

but from what ive seen its changing the mesh all the time 😛

bright sentinel May 16, 2021, 11:08 AM

#

Never heard of impostors, what are they even?

gusty comet May 16, 2021, 11:11 AM

#

impostors are fake 3d models that are '2d only' with proper rotation scale and position they look as if they were real models
https://assetstorev1-prd-cdn.unity3d.com/package-screenshot/ce9d59c0-6239-4151-b3ba-82efa6b0db87.webp

#

theres few impostor assets/engines

#

i especially need it for objects that are a bit further (if not for all) from player, i hope its easily convertable 😛, will soon attempt it
if i wont be able to convert it, however, it would be ironic cus id be getting more gains from it than from DOTS.. 😛

bright sentinel May 16, 2021, 11:17 AM

#

Oh, so billboard sprites. Well ECS doesn't really have 2D support, so I don't think you can do that

karmic basin May 16, 2021, 11:18 AM

#

You could make quads

#

If you already have a LOD system it could be max level

gusty comet May 16, 2021, 11:19 AM

#

theyre still rendered with meshfilter

karmic basin May 16, 2021, 11:20 AM

#

yeah but it's only 2 triangles

#

or you could hack your way through the vfx system but dunno how much more efficient it would be

#

I would start with a LOD system, then quad billboards if further needed

gusty comet May 16, 2021, 11:25 AM

#

im fine with rendermesh component

gusty comet May 16, 2021, 12:01 PM

#

the asset is nice and works unnoticeable at big distance but each model data is minimum 5mb lol i wonder how much memory will it eat with 500 models..

opal field May 16, 2021, 12:06 PM

#

does it pregenerate the images for impostering?

gusty comet May 16, 2021, 12:10 PM

#

yeah

hollow jolt May 16, 2021, 12:11 PM

#

how to access child parent relation in ecs ? i see there is the Child and Parent

#

but only the Parent is inherited from the IComponentData

#

and looking at one of the entities i got - it contains the child component in it

opal field May 16, 2021, 12:12 PM

#

gusty comet yeah

i guess it allows to limit the number of angles it generates and maybe their quality. that should reduce the memory footprint

#

i wonder if it does the correct angle texture selection in the shader

hollow jolt May 16, 2021, 12:21 PM

#

gusty comet impostors are fake 3d models that are '2d only' with proper rotation scale and p...

hv u tried this one ? https://assetstore.unity.com/packages/tools/utilities/impostors-runtime-optimization-188562

Impostors - Runtime Optimization | Utilities Tools | Unity Asset Store

Use the Impostors - Runtime Optimization from STARasGAMES on your next project. Find this utility tool & more on the Unity Asset Store.

#

Utilizes max performance using Jobs and Burst

#

how to access entity child ?

#

it doesn't like var item = entity_manager.GetComponentData<Child>( my_entity );

#

since child doesn't inherits IComponentData but does IBufferElementData instead ? __ ?

#

ah nvm i got it

var childBuffer = entity_manager.GetBuffer<Child>( hit.Entity );
foreach( var well_buffed_child in childBuffer )
{
    Entity child_entity = well_buffed_child.Value;
}

just need to use a buffer

dusty shuttle May 16, 2021, 3:06 PM

#

Hello guys, I m actually starting using dots, I m using Unity 2020.3.8 with every package needed. I tried to create a system who manipulate a transform, but that 's doesn't work as expected lol.
I create a struct : private struct Group : IComponentData with a Transform, then in the OnUpdate I get every Entity (or GameObject) with :

        Entities.WithAll<Group>().ForEach(
            (ref Group Group)=>
            {
                var position = Group.Transform.position;

                position += (Group.Speed.Value * DirectionHelper.GetDirectionalValue(Group.PlayerInput.DirectionValue)) * DeltaTime;

                Group.Transform.position = position;
            }
        );```

But it seems that I can't get a Transform on the OnUpdate anymore, it says that transform is not primitive nor blittable.

Any idea how I can go through this difficulty ? 🙂
For information, I m looking for a ECS Hybrid implementation.

jaunty herald May 16, 2021, 4:18 PM

#

Does EntityManager.CreateArchetype() require something specific for DynamicBuffers?

#

It tells me the buffer doesn't exist on the entity, even though it is in the list of components...

sour atlas May 16, 2021, 4:18 PM

#

hey so i have a 1d array that i need to turn into a 2d array

ideally id like to parallelise this and as far as i understand i can use a job to do that however the 2d float array is not thread safe as far as i understand and that means changing it in a job doesnt actually overwrite the actual array, is that correct ?

jaunty herald May 16, 2021, 4:19 PM

#

Why not just remap indices @sour atlas ?

warped trail May 16, 2021, 4:21 PM

#

@dusty shuttleyou can't put managed types in IComponentData

jaunty herald May 16, 2021, 4:23 PM

#

Actually you can, as long as it's a class, not a struct. But it probably shouldn't be used

sour atlas May 16, 2021, 4:24 PM

#

jaunty herald Why not just remap indices <@!218382949559566336> ?

i need to pass the array to a terrain object and that only accepts 2d arrays

dusty shuttle May 16, 2021, 4:25 PM

#

Alright, so what the good way do without the struct IComponentData to you guys? Thank you for your help

Seems like the Entity package works really differently than before ahah

sour atlas May 16, 2021, 4:25 PM

#

        heightmap = new float[size, size];
        for (int i = 0; i < size * size; i++) {
            int x = i % size;
            int z = (int)(i / size);
            heightmap[x, z] = heightmapBuffer[i];
        }
        heightmapBuffer.Dispose();
        terrainData.SetHeights(0, 0, heightmap);

since the Parallel for job only takes an index i should be able to use this except as a job, but i cant override the original heightmap array from the job as far as i understand it

#

or is it possible to pass the reference to my array ?

jaunty herald May 16, 2021, 4:27 PM

#

Do jobs support arrays now? I thought they didn't

sour atlas May 16, 2021, 4:27 PM

#

NativeArrays only i think ? im really new to jobs so i dont have much of an idea 😛

jaunty herald May 16, 2021, 4:28 PM

#

Yeah, I don't think they support any kind of managed array

#

Your best bet is probably using a direct memory copy

#

You'll need to make sure your array is properly aligned though

#

Something along these lines: https://stackoverflow.com/questions/55527580/how-to-convert-2-d-array-to-1-d-array-fast-in-c/55527679

sour atlas May 16, 2021, 4:30 PM

#

i need 1d to 2d though

jaunty herald May 16, 2021, 4:30 PM

#

The reverse is also possible :)

sour atlas May 16, 2021, 4:30 PM

#

oh, alright ill look into that, thanks!

jaunty herald May 16, 2021, 4:31 PM

#

Ideally whatever is processing the array in your terrain code should use a 1d array, as it's simply faster

sour atlas May 16, 2021, 4:33 PM

#

oh right now its being read from a render texture

jaunty herald May 16, 2021, 4:33 PM

#

@dusty shuttle I would look at the ECS docs, they have a good introduction

sour atlas May 16, 2021, 4:33 PM

#

which is written to by a shader

jaunty herald May 16, 2021, 4:37 PM

#

I think I may have found a bug, unless this is intended behaviour: https://pastebin.com/ZPmM32De

#

It feels like that shouldn't be happening...

warped trail May 16, 2021, 4:58 PM

#

@jaunty heraldi don't get this error🤔

jaunty herald May 16, 2021, 5:03 PM

#

Very strange, it seems you aren't allowed to statically define archetype component arrays, even as a property.

#

Basically, something like this doesn't work:

public static ComponentType[] WorldCellArchetype => new ComponentType[]
    {
        typeof(SerializeEntity),
        typeof(WorldCellData),
        typeof(WorldCellNeighbour),
        typeof(WorldCellEdge),
        typeof(NetworkIdentity)
    };

#

Changing it to a field will even throw an error on compile-time

#

https://pastebin.com/vjVZwUmb

#

Never read anything about this before...

#

I guess typeof() is somehow being overwritten and only works during runtime?

#

Still not sure why a property wouldn't work then however, since that is also during runtime...

#

Not even a method works thonk

#

But inplace it works for some reason, very strange...

warped trail May 16, 2021, 5:17 PM

#

@jaunty herald https://pastebin.com/dzVfAfsB this works just fine or i'm doing something wrong?

jaunty herald May 16, 2021, 5:18 PM

#

Try it as a field, it throws an error for me on compilation

warped trail May 16, 2021, 5:23 PM

#

i declared ComponentType[] as a field, assigned it in Start method and it works fine😅

jaunty herald May 16, 2021, 5:24 PM

#

Very strange, your example works in a standalone project.

#

https://streamable.com/gql22z

#

Very odd, @warped trail . Maybe I'm just missing something simple 🤷

#

If I put the array in the class itself, it works. So I assume this is some kind of static initialization / caching issue

warped trail May 16, 2021, 5:35 PM

#

oh, maybe it has to do with this fancy fast enter playmode?

jaunty herald May 16, 2021, 5:35 PM

#

No, I don't have that on.

warped trail May 16, 2021, 5:35 PM

#

i remember it has some problem with statics

jaunty herald May 16, 2021, 5:36 PM

#

It still seems like a bug. I feel like EntityManager.GetComponentTypes() shouldn't be returning types that aren't actually accessible at that time?

fallen pilot May 16, 2021, 5:36 PM

#

Any idea how to use native array instead of native list

jaunty herald May 16, 2021, 5:36 PM

#

Exactly like an array @fallen pilot

fallen pilot May 16, 2021, 5:37 PM

#

I am using an A* algorithm for Pathfinding and instead of native list I want to use native arrays

jaunty herald May 16, 2021, 5:39 PM

#

Then you need to find an upper bound for the amount of nodes in your queue / path, which is probably the reason why it uses a list in the first place.

#

Ideally, just use a list and initialize it with a high value, or replace the lists with arrays and check if the array is big enough before accessing indices. It's probably not worth it and very error prone however...

#

Since you will need to memcpy anyways if the array is too small

sour atlas May 16, 2021, 5:42 PM

#

jaunty herald The reverse is also possible :)

alright checked up on it and it seems thats not possible using the NativeArray class unless i am missing something. Itd be possible if i convert the native array to a managed array first and then use block copy but that seems like its going to be unnecessary overhead, any ideas ?

jaunty herald May 16, 2021, 5:43 PM

#

Why wouldn't it work? Nativearrays even have a copy from / to method for managed arrays

warped trail May 16, 2021, 5:43 PM

#

he has multidimensional array

jaunty herald May 16, 2021, 5:44 PM

#

Yeah, convert the multidimensional array to 1d, then copy

sour atlas May 16, 2021, 5:44 PM

#

well it does work but converting to a managed array seems unnecessary given that ill be doing 3 copies that way, likely going to be faster to just iterate at that point ?

jaunty herald May 16, 2021, 5:44 PM

#

I doubt it, but you can just try

#

memory copy is very fast

#

Obviously depends on the sizes you are dealing with :)

sour atlas May 16, 2021, 5:46 PM

#

hrm. depends on how fast the internal conversion is id argue

#

ill try it

jaunty herald May 16, 2021, 5:46 PM

#

There is no conversion, it's copying memory

sour atlas May 16, 2021, 5:46 PM

#

its relatively large at 4097x4097

sour atlas May 16, 2021, 5:46 PM

#

jaunty herald There is no conversion, it's copying memory

i mean internal native to managed

jaunty herald May 16, 2021, 5:47 PM

#

I feel like it should somehow be possible to create a nativearray from memory somehow, but that would probably be unsafe. Never tried it 🤷

sour atlas May 16, 2021, 5:47 PM

#

never really managed to find out how unsafe works in unity 😛

jaunty herald May 16, 2021, 5:48 PM

#

Maybe something along these lines could work, but it seems a lot of hassle. I would make sure you really need the optimization: https://docs.unity3d.com/ScriptReference/Unity.Collections.LowLevel.Unsafe.NativeArrayUnsafeUtility.ConvertExistingDataToNativeArray.html

sour atlas May 16, 2021, 5:48 PM

#

also surely it should be possible to pass a job the reference to an array and then work with that ...

jaunty herald May 16, 2021, 5:49 PM

#

Not sure what you mean by reference to an array. Jobs cannot use managed arrays at all iirc

sour atlas May 16, 2021, 5:49 PM

#

as far as i understood it they can but itll never overwrite the original array and instead use an internal copy or something ? but i might have misunderstood

jaunty herald May 16, 2021, 5:50 PM

#

Hmm, haven't heard that before. But I haven't been looking either, I always just use the native collections for everything 🤷

sour atlas May 16, 2021, 5:51 PM

#

hrm. ill just go ask a friend, they use burst a lot so im hoping they know

jaunty herald May 16, 2021, 5:57 PM

#

Good luck! :) And let me know if you find out about managed arrays in jobs, that sounds interesting

warped trail May 16, 2021, 5:58 PM

#

Burst documentation says "Managed arrays are not supported by Burst" and "Burst supports reading from readonly managed arrays loaded only from static readonly fields"

sour atlas May 16, 2021, 6:01 PM

#

read it here :

Restrictions of the Native Container

You cannot pass references to a job because that would break the job’s thread safety. That means you can’t send in an array with the data you want as a reference. If you pass an array, the job will copy each element from the array to a new array within the job. This is a waste of memory and performance.

https://www.raywenderlich.com/7880445-unity-job-system-and-burst-compiler-getting-started#toc-anchor-001

raywenderlich.com

Unity Job System and Burst Compiler: Getting Started

In this tutorial, you’ll learn how to use Unity’s Job System and Burst compiler to create efficient code to simulate water filled with swimming fish.

#

also where do i go to get help with unity hard crashing ?

sour atlas May 16, 2021, 6:12 PM

#

jaunty herald Good luck! :) And let me know if you find out about managed arrays in jobs, that...

ive been told its possible but messy and not useful at all in my case

hollow jolt May 17, 2021, 1:03 AM

#

How come when I'm using

var component_types = my_entity_manager.GetComponentTypes( my_entity_target );

It contains the ChunkWorldRenderBounds type , but when I'm trying to read it with GetComponentData it throws me the following error ?

ArgumentException: A component with type:ChunkWorldRenderBounds has not been added to the entity.

#

and in the same time

entity_manager.HasComponent( my_entity_target, comp_type );

is true o_O

robust scaffold May 17, 2021, 1:07 AM

#

hollow jolt How come when I'm using ```cs var component_types = my_entity_manager.GetCompon...

Is ChunkWorldRenderBounds a shared component or managed component? I dont think the latter would be any different but former will require different syntax

hollow jolt May 17, 2021, 1:08 AM

#

what's a managed component ?

robust scaffold May 17, 2021, 1:09 AM

#

hollow jolt what's a managed component ?

An IComponentData that is declared as a Class. You can place managed properties in it like strings or regular arrays. Downside is: you can not use them in a regular burst or multithreaded job.

hollow jolt May 17, 2021, 1:09 AM

#

ChunkWorldRenderBounds is a struct

robust scaffold May 17, 2021, 1:09 AM

#

If you dont use them, dont worry about it. Just check if it's a shared component.

#

Alright, so regular IComponentData. Then hrm, HasComponent() returns true but immediately after it says not added to entity? With the same entity?

hollow jolt May 17, 2021, 1:11 AM

#

wait what's the difference between shared and managed ?

#

i do checks for shared components

hollow jolt May 17, 2021, 1:11 AM

#

robust scaffold Alright, so regular IComponentData. Then hrm, `HasComponent()` returns true but ...

yes

robust scaffold May 17, 2021, 1:11 AM

#

hollow jolt wait what's the difference between shared and managed ?

https://docs.unity3d.com/Packages/com.unity.entities@0.17/manual/ecs_components.html

hollow jolt May 17, 2021, 1:13 AM

#

interesting

robust scaffold May 17, 2021, 1:13 AM

#

hollow jolt yes

The name ChunkWorldRenderBounds implies either a shared component or a chunk component. Probably the latter. Try using EntityManager.GetChunkComponentData() for that component.

hollow jolt May 17, 2021, 1:14 AM

#

is there a way how to check if it is a chunk component or not ?

#

don't seem like its possible

#

ill try HasChunk ...

robust scaffold May 17, 2021, 1:15 AM

#

hollow jolt

Typically you know what component it is since you create the archetype. But if it's coming from HybridRenderer, no clue.

hollow jolt May 17, 2021, 1:15 AM

#

robust scaffold Typically you know what component it is since you create the archetype. But if i...

yes

#

hasChunk worked , i don't get any more errors and can finally parse the entity

robust scaffold May 17, 2021, 1:22 AM

#

hollow jolt hasChunk worked , i don't get any more errors and can finally parse the entity

There ya go. If you need to use ChunkComponents inside a bursted job, you'll need to dive into the "exciting" world of struct based job declarations. https://docs.unity3d.com/Packages/com.unity.entities@0.17/manual/ecs_chunk_component.html#iterating-over-chunks-to-set-chunk-components

hollow jolt May 17, 2021, 1:23 AM

#

thanks but approach doesn't use jobs much

#

not sure how cursed it is but it seem to do the trick

robust scaffold May 17, 2021, 1:24 AM

#

hollow jolt thanks but approach doesn't use jobs much

Hrm, are you sure about that? The entire reason to use DOTS is for the Job system and burst. Otherwise, it's a very inefficient way to create a bunch of arrays.

hollow jolt May 17, 2021, 1:25 AM

#

well i just need to modify the physics colliders

#

already found a way to read vertex data from the Collider Ptr with some unsafe code

#

now im trying to clone an entity

robust scaffold May 17, 2021, 1:26 AM

#

Oh alright, good luck then. Why not use EntityManager.Instantate?

hollow jolt May 17, 2021, 1:26 AM

#

will it copy all the component data as well ?

robust scaffold May 17, 2021, 1:26 AM

#

Yea

hollow jolt May 17, 2021, 1:26 AM

#

sigh ...

#

lol

#

what about the children ?

robust scaffold May 17, 2021, 1:27 AM

#

Hrm, no clue. DOTS emphasizes flattening your hierarchy so I've never tried to see if Instantate copies children. Probably not.

hollow jolt May 17, 2021, 1:27 AM

#

hollow jolt hasChunk worked , i don't get any more errors and can finally parse the entity

this example has 1 child that contains the renderer

#

in my case i would need to modify both the phyiscs collider and the mesh vertex data which exists on 2 different entities

robust scaffold May 17, 2021, 1:28 AM

#

Children is just a DynamicBuffer of Entities so 99% no, Instantate will probably not create a child entity.

hollow jolt May 17, 2021, 1:28 AM

#

well it does save me a lot of efford tho

#

i can just loop them kids and glue the parent value

#

if using EntityManager.Instantate

robust scaffold May 17, 2021, 1:30 AM

#

hollow jolt in my case i would need to modify both the phyiscs collider and the mesh vertex ...

#

Yes it does clone children entities so long as it's using a LinkedEntityGroup dynamic buffer of entities.

hollow jolt May 17, 2021, 1:32 AM

#

LinkedEntityGroup that;s a new one as well for me

robust scaffold May 17, 2021, 1:33 AM

#

hollow jolt `LinkedEntityGroup` that;s a new one as well for me

Seems like you're very new to DOTS. Yea, the documentation isnt the best but all of this stuff is buried in there. LinkedEntityGroup is just the GameObject hierarchy translated to DynamicBuffer<Entity> via the Entity converter.

#

Honestly DOTS is an absolute mess. I dont recommend on using it unless you want to spend months doing the wrong thing until you stumble upon the correct way to code then throw the previous months work out the window.

hollow jolt May 17, 2021, 1:34 AM

#

sounds like you suffered for some time now

#

can i dm u ?

robust scaffold May 17, 2021, 1:35 AM

#

I've been working with dots for a few years now. Do you need something specific? This channel is good enough. It's very quiet and more public information on DOTS is good.

hollow jolt May 17, 2021, 2:56 AM

#

~~doesn't seem to be happy when im trying to clone its children ~~

ArgumentException: A component with type:Child [B] has not been added to the entity.

~~at the second line : ~~

foreach( var child in entity_manager.GetBuffer<Child>( entity ) )
  var copy_child = Instantiate( entity_manager, child.Value );

#

nvm that i had some recursion issues

robust scaffold May 17, 2021, 3:04 AM

#

hollow jolt nvm that i had some recursion issues

Make sure to use EntityManager.Instantate, not the built in GameObject Instantate.

hollow jolt May 17, 2021, 3:05 AM

#

that's what i ended up with and seems to work so far

#

#

just need to figure out why the physics constants ( joints ) are not being cloned

robust scaffold May 17, 2021, 3:16 AM

#

Times like this makes me regret knowing DOTS so well. I am paralyzed with decisions. I have a Company entity that issues 100 shares. These shares are distributed among People entities. Do I throw efficient chunk layout out the window and create a DynamicBuffer of Entities (Entity struct is 8 bytes wide) resulting in an 0.8 kB memory utilization. This doesnt include the numerous other Components and Buffers also attached to the entity. Already, that's a max chunk size of 20 entities or less.

#

Another option is instead store an Entity reference on the People entities themselves. That brings into question whether a Top-Down iteration process is more efficient than a Bottom-Up connection. I've done far too many tests and it's still a toss-up on that.

#

Furthermore, I am struggling with the decision to use shared components to fragment my entity chunks and use chunk components. It'll simplify a lot of the value aggregation systems for various calculations but I'm concerned with all those warnings about over-use of shared components leading to inefficient chunk utilization.

deft stump May 17, 2021, 3:21 AM

#

robust scaffold Times like this makes me regret knowing DOTS so well. I am paralyzed with decisi...

I feel the same.
it's like eating the forbidden fruit of knowledge that is DOTS.
and now God(Unity) has thrown us out of the Garden of MonoB.

robust scaffold May 17, 2021, 3:21 AM

#

deft stump I feel the same. it's like eating the forbidden fruit of knowledge that is DOTS....

Yea, doesnt help that DOTS itself is fairly undocumented and truly efficient processes have to be found using brute force trial and error.

#

I have a 1000 line system where I test out various Entity hierarchy structures and data summation/aggregation systems to test performance. Very simple sum the value of 5000 entities grouped by a identifier property. I still have not attempted deliberate chunk fragmentation via shared components because I'm terrified of the warnings from Unity.

deft stump May 17, 2021, 3:24 AM

#

God(Unity) has forsaken us

hollow jolt May 17, 2021, 3:24 AM

#

if u r looking for optimal performance why not use something like gadot ?

robust scaffold May 17, 2021, 3:24 AM

#

hollow jolt if u r looking for optimal performance why not use something like gadot ?

Gadot?

deft stump May 17, 2021, 3:25 AM

#

Gadot? or Godot?

hollow jolt May 17, 2021, 3:25 AM

#

2nd one

deft stump May 17, 2021, 3:25 AM

#

also no, godot isn't as performant as you think.

robust scaffold May 17, 2021, 3:26 AM

#

If it's Godot, Godot is not performance friendly. Burst and the Job system outstrips anything out there by orders of magnitude. I'm talking about microsecond improvements via rearranging Entity component structure.

deft stump May 17, 2021, 3:26 AM

#

compared to dots

robust scaffold May 17, 2021, 3:27 AM

#

Anyways, I'll just post the various results I got from testing in this channel. Time values obtained from the Profiler and eyeballing the times so they're not the most accurate of values

hollow jolt May 17, 2021, 3:29 AM

#

what about something like this https://www.youtube.com/watch?v=tInaI3pU19Y

YouTube

Nick Caston

Unity DOTS vs Handbuilt: Sample Project

Comparison between one of Unity's sample ECS/DOTS projects, and a "from scratch" cloned implementation using C++ and OpenGL. Bringing some data to the game engine discussions. Custom game engine vs Unity DOTS!

Unity sample project repo: https://github.com/UnityTechnologies/AngryBots_ECS

C++ clone source: https://github.com/ntcaston/AngryGL

Yo...

▶ Play video

solar spire May 17, 2021, 3:29 AM

#

That's a super unfair comparison that doesn't really have much real-world impact

hollow jolt May 17, 2021, 3:30 AM

#

but it does reach optimal performance for an edge case

robust scaffold May 17, 2021, 3:30 AM

#

Hrm, Im not using hybrid renderer. Personally, I think HybridRenderer was a mistake.

hollow jolt May 17, 2021, 3:31 AM

#

robust scaffold Hrm, Im not using hybrid renderer. Personally, I think HybridRenderer was a mist...

why is that ?

robust scaffold May 17, 2021, 3:31 AM

#

If you need anything done graphically that needs entities, just do it in ComputeShaders

hollow jolt May 17, 2021, 3:31 AM

#

true it would be faster

robust scaffold May 17, 2021, 3:31 AM

#

And roll your own solution with a bunch of arrays.

solar spire May 17, 2021, 3:32 AM

#

Just write it in assembly and then you get all the benefits

deft stump May 17, 2021, 3:32 AM

#

we need to go lower.
input 1's and 0's

#

write your game in binary.

hollow jolt May 17, 2021, 3:33 AM

#

0x796573 ( yes )

#

once i get a neuralink* implant

robust scaffold May 17, 2021, 3:34 AM

#

Anyways, the entity relationship is as follows:

Entity People
  Component int Quantity
  Component Entity Province
Entity Province
  Component int Survey
  Component Entity Country
Entity Country
  Component int Census```
Provinces sum the `Quantity` of People entities that contains the corresponding Province entity component into `Survey`. Countries do the same with Province `Survey`s into `Census`.
This exact structure changes between tests which I'll describe per result.

solar spire May 17, 2021, 3:37 AM

#

The comparisons between different things like this do not make sense practically, that video is comparing an old entry-level ECS implementation without any acceleration from burst or jobs. It's a surface level clickbait comparison of two things with completely different capabilities, one's an ecosystem enabling fast and varied code, and the other is a specific implementation authored to do one exact thing.

robust scaffold May 17, 2021, 3:37 AM

#

The first attempt was Bottom-Up iteration structure.
Each Person Entity used their Province entity component to query and set the Survey component using GetComponent() and SetComponent() in a singlethreaded Schedule(). The same with the Province -> Country.
Result: ~ 0.11 ms to 0.13 ms. Occasional spikes to 0.3 ms+.

hollow jolt May 17, 2021, 3:38 AM

#

solar spire The comparisons between different things like this do not make sense practically...

well yes but somebody who knows how to openGL with cpp might not need 90% of what a game engine has to offer and could potentially make a simple game / app using this approach

solar spire May 17, 2021, 3:39 AM

#

Sure, but that's not what 90% of the people watching the video are there for

#

it's just a great avenue for complaining

hollow jolt May 17, 2021, 3:39 AM

#

i think its a very cool proof of concept for performance

#

and click-bait ofc

robust scaffold May 17, 2021, 3:41 AM

#

Second attempt was another Top-Down iteration structure.
There was an external NativeMultiHashMap where a first stage per Person entity ForEach would populate the native container using Province Entity. A second stage using Provinces and Countries (with a dynamic buffer of all related Province components) scheduled with ScheduleParallel() and in parallel with each other using manual dependency handling.
Result: ~ 0.1 ms to 0.5 ms depending on cache miss. Using external native containers such as NativeMultiHashMap seems to massacre performance. What I learned is to be very hesitant on using them.

#

It could be something I was doing wrong with the NMHM but the random read write parallel performance was not good.

#

Third attempt was the extreme version of Bottom Up iteration.
It denormalized the entity relationship to which the People entity would contain references to both the province and country it resided in and used a singlethreaded add to both the Survey and Census quantity of both Province and Country entities.
Result: ~ 0.13 ms to 0.5 ms in a single job thread. Definitely not good.

hollow jolt May 17, 2021, 3:47 AM

#

quick question , when inspecting chunks in the EntityDebugger does it mean those are unique entities ?

robust scaffold May 17, 2021, 3:48 AM

#

The fourth was a Top-Down iteration.
Each Province and Country would contain a DynamicBuffer<Entity> of the related children entities. Using a rotating buffer of Read-Write access, it queried the childs' int quantity component and summed it.
Result: ~ 0.08 ms. The best result yet. Why? I am still trying to find out.

robust scaffold May 17, 2021, 3:48 AM

#

hollow jolt quick question , when inspecting chunks in the EntityDebugger does it mean those...

Unique entities?

hollow jolt May 17, 2021, 3:48 AM

#

robust scaffold May 17, 2021, 3:48 AM

#

hollow jolt

Those are unique archetypes.

hollow jolt May 17, 2021, 3:49 AM

#

can an entity exist inside multiple archetypes ?

robust scaffold May 17, 2021, 3:50 AM

#

hollow jolt can an entity exist inside multiple archetypes ?

No. An entity is characterized by a set of Components. The collection of which is an Archetype. Multiple entities can have the same set of components types (doesnt need to be the same value).

#

It's like a Class of entity.

#

An object can only have 1 class. Multiple objects can have that same class but an object can only be of one class.

#

Unlike a object, you can add or subtract different properties to that class at runtime, resulting in a different class or completely new class. Replace all class with Archetype and that's DOTS.

hollow jolt May 17, 2021, 3:52 AM

#

so a chunk is a list of similar archetypes ?

robust scaffold May 17, 2021, 3:53 AM

#

A chunk is a list of Entities with exactly the same Archetypes

hollow jolt May 17, 2021, 3:53 AM

#

ah ok

#

thanks

robust scaffold May 17, 2021, 3:53 AM

#

It's like an array of objects. That array can only be of one class (ignoring interfaces). If you add a new component to that Entity, it must move to a different array or create a new one.

hollow jolt May 17, 2021, 3:54 AM

#

if you add a new component type that is ?

robust scaffold May 17, 2021, 3:55 AM

#

hollow jolt if you add a new component type that is ?

It's like adding a new property to a class. A new float value or something else.

hollow jolt May 17, 2021, 3:55 AM

#

yep

#

i think i got the jist of it

#

gonna clone them joints now

robust scaffold May 17, 2021, 3:56 AM

#

Good luck. DOTS physics API is very raw. I'm personally holding off until the next release of DOTS packages (probably in a year or two, thanks Unity) before experimenting with it.

hollow jolt May 17, 2021, 3:57 AM

#

its an open source engine which is good

#

mine is already slightly modified

robust scaffold May 17, 2021, 3:58 AM

#

Good luck. I couldn't understand a single line of the source. If I ever get to the point where I need my own physics engine, I'll throw myself at the research papers of GPU side physics rather than languish in CPU hell.

hollow jolt May 17, 2021, 3:58 AM

#

oh man that's like the dream

robust scaffold May 17, 2021, 3:59 AM

#

I mean, how hard can it be. The GPU already has vertex data due to needing to render it. Simply do physics as well. Yea.

hollow jolt May 17, 2021, 3:59 AM

#

there are few attempts on the web so far ( unity )

#

nothing that is stable / easily usable

#

mainly been looking at water simulations

#

but those aren't bidirectional ( it only reacts to the normal physics )

robust scaffold May 17, 2021, 4:00 AM

#

Yea, mainly abandoned projects or proof of concepts. I mean, I technically roll my own screen based raycasting system onto a sphere but that's simple mathematics.

hollow jolt May 17, 2021, 4:01 AM

#

there is a Gpu based raycaster repo

#

not sure if its the same as u did

#

https://github.com/staggartcreations/Graphics-Raycast

robust scaffold May 17, 2021, 4:02 AM

#

Probably not. I display the UV of a sphere as the texture of the ball. Then sample it both to display texture in post processing and calculate clicked location.

hollow jolt May 17, 2021, 4:24 AM

#

robust scaffold I mean, how hard can it be. The GPU already has vertex data due to needing to re...

if u decide to do something like this give me a ping , im interested in making something similar to teardown

hollow jolt May 17, 2021, 4:49 AM

#

is there a way to use Entities.ForEach outside of SystemBase and in IJob ?

hollow jolt May 17, 2021, 5:42 AM

#

i think i found it but its obsolete .. ?

solar spire May 17, 2021, 5:46 AM

#

It tells you what to use

hollow jolt May 17, 2021, 5:47 AM

#

reading IJobChunk now

hollow jolt May 17, 2021, 7:12 AM

#

not sure if im doing it right , but the amount of code it takes to do a simple search is ridiculous

    public struct JointBodyPair
    {
        public PhysicsJoint joint;
        public PhysicsConstrainedBodyPair bodyPair;
    }

    JointBodyPair[] FindTargetJointFor( Entity target )
    {
        NativeList<JointBodyPair> result = new NativeList<JointBodyPair>( Allocator.TempJob );

        EntityManager entity_manager = World.DefaultGameObjectInjectionWorld.EntityManager;

        var job = new CloneJointsJob() 
        {
            Handle_Joint = entity_manager.GetComponentTypeHandle<PhysicsJoint>( false ),
            Handle_Pair = entity_manager.GetComponentTypeHandle<PhysicsConstrainedBodyPair> ( false ),
            target = target,
            output = result
        };

        var query = entity_manager.CreateEntityQuery(new EntityQueryDesc()
        {
            All = new ComponentType[] 
            {
                ComponentType.ReadOnly<PhysicsJoint>(),
                ComponentType.ChunkComponent<PhysicsConstrainedBodyPair>()
            }
        } );

        job.Schedule(query).Complete();
        //job.ScheduleParallel( query ).Complete();

        var data = result.ToArray();
        result.Dispose();
        return data;
    }

#

    public struct CloneJointsJob : IJobChunk
    {
        [ReadOnly] 
        public ComponentTypeHandle<PhysicsJoint> Handle_Joint;
        public ComponentTypeHandle<PhysicsConstrainedBodyPair> Handle_Pair;
        [NativeDisableParallelForRestriction] public NativeList<JointBodyPair> output;
        public Entity target;

        public void Execute( ArchetypeChunk chunk, int chunkIndex, int firstEntityIndex)
        {
            var value_joint = chunk.GetChunkComponentData( Handle_Joint );
            var value_pair = chunk.GetChunkComponentData( Handle_Pair );

            var data = new JointBodyPair
            {
                bodyPair = value_pair,
                joint = value_joint
            };

            if (value_pair.EntityA == target || value_pair.EntityB == target ) 
                
                output.Add( data );
        }
    }

robust scaffold May 17, 2021, 7:20 AM

#

hollow jolt ```cs public struct CloneJointsJob : IJobChunk { [ReadOnly] ...

Do you have to use an IJobChunk? If you do, yea that's about normal.

hollow jolt May 17, 2021, 7:21 AM

#

robust scaffold There ya go. If you need to use ChunkComponents inside a bursted job, you'll nee...

as u suggested

#

what i need is a way to iterate all chunks of PhysicsJoint & PhysicsConstrainedBodyPair

hollow jolt May 17, 2021, 7:23 AM

#

hollow jolt i think i found it but its obsolete .. ?

if this would be an option it would be ideal

#

whenever i do dots i have an odd feeling that somebody wanted to over engineer the framework for some reason

robust scaffold May 17, 2021, 7:27 AM

#

hollow jolt as u suggested

Hrm.... yeaaaa. Such is life. I'm doing something similar because I'm trying to do some summations into a chunk component and thus have to use miles of boilerplate IJobChunk structs. Fun.

robust scaffold May 17, 2021, 7:28 AM

#

hollow jolt whenever i do dots i have an odd feeling that somebody wanted to over engineer t...

Welcome to DOTS. Where everything is simultaneously overly complicated and also half baked.

hollow jolt May 17, 2021, 7:28 AM

#

its like giving us a half baked abstraction layer for multi threading without the actual access to the low level stuff ...

robust scaffold May 17, 2021, 7:29 AM

#

On the flip side, if you use IJobChunks everywhere, you can use ISystemBase and go all in on the structs and BurstCompile everything.

hollow jolt May 17, 2021, 7:29 AM

#

bursting all sounds promising

#

funny i just realized the code above runs without errors but also returns zero results ...

robust scaffold May 17, 2021, 7:30 AM

#

Kinda, the catch is that the only nativecontainer you can use is NativeArray and Entities.

#

I want to use a native multi hash map but it's so fucking hard. Why Unity...

hollow jolt May 17, 2021, 7:31 AM

#

doing grids ?

robust scaffold May 17, 2021, 7:32 AM

#

Nah, just parallel summation.

hollow jolt May 17, 2021, 7:33 AM

#

when i need code examples i do the following : https://github.com/search?p=2&q=NativeMultiHashMap+grid&type=Code

robust scaffold May 17, 2021, 7:35 AM

#

hollow jolt when i need code examples i do the following : https://github.com/search?p=2&q=N...

Nah, I know my way around unity collections by now. It's just trying to get it to dispose while burst compiled is the problem.

#

#

Burst is amazing, but also very dumb.

hollow jolt May 17, 2021, 7:39 AM

#

lol

robust scaffold May 17, 2021, 7:39 AM

#

#

Oh fuck, never mind. Hrm

hollow jolt May 17, 2021, 7:40 AM

#

SystemState is something in dots ?

robust scaffold May 17, 2021, 7:41 AM

#

Yea, it's the various functions available in SystemBase. Since structs can not extend anything, it's all storied in SystemState

hollow jolt May 17, 2021, 7:41 AM

#

also i think i see why it didn't look for all the elements, but now i wonder if those arrays would be aligned or not ... 🤔

robust scaffold May 17, 2021, 7:42 AM

#

Oh yea. Since you're not using a lambda function, you'll need to guarantee component alignment manually.

hollow jolt May 17, 2021, 7:42 AM

#

O_o

#

is that even possible ?

hollow jolt May 17, 2021, 7:43 AM

#

hollow jolt

in the debug dialog those look like they are already aligned

robust scaffold May 17, 2021, 7:43 AM

#

It is, Unity does it somehow. The Entities.ForEach() lambda function is translated to a simple IJobChunk at compile time.

#

Anything you can do with a ForEach you can do in a IJobChunk, just with a lot more code.

hollow jolt May 17, 2021, 7:44 AM

#

i see , so i guess those arrays are already aligned

#

time to trial and error again

robust scaffold May 17, 2021, 7:44 AM

#

Yep, that's what we all are doing. And what i'm trying to do with this.... and Unity crashed. Fun.

hollow jolt May 17, 2021, 7:45 AM

#

rip

#

a day without a crash is a day when i didn't dig deep enough

amber flicker May 17, 2021, 7:46 AM

#

Fyi (earlier post I saw), Instantiate can also take an array of entities - in case you don’t have a linkedEntityGroup and it correctly replaces inter-entity references- pretty useful

robust scaffold May 17, 2021, 7:48 AM

#

#

Alright, this does work. Do not remove the ref anywhere. Burst will cause Unity to crash if removed.

hollow jolt May 17, 2021, 7:53 AM

#

robust scaffold Alright, this does work. Do not remove the `ref` anywhere. Burst will cause Unit...

amber flicker May 17, 2021, 7:55 AM

#

Can you make that nmhm persistent instead?

robust scaffold May 17, 2021, 7:56 AM

#

amber flicker Can you make that nmhm persistent instead?

Nope, you cant store managed components in the property field of a bursted system. It basically becomes a IComponentData.

amber flicker May 17, 2021, 7:57 AM

#

I think as long as you use a ref it’s fine?

robust scaffold May 17, 2021, 7:58 AM

#

amber flicker I think as long as you use a ref it’s fine?

Ref where? The interface between [BurstCompile]'ed code and [BurstDiscard] managed requires the ref but storing it as a property of the system itself doesnt work.

solar spire May 17, 2021, 8:06 AM

#

Does anyone know how to schedule a NativeList.Sort after a job that uses the list? It appears to me like using the dependency JobHandle from the prev job does nothing as the unsafe pointer is accessed when Sort is called

robust scaffold May 17, 2021, 8:10 AM

#

solar spire Does anyone know how to schedule a NativeList.Sort after a job that uses the lis...

Does this not work?

var job = Entities.ForEach().Schedule(Dependency);
job = NativeList.Sort(job);
Dependency = job;```

#

Or are you using struct based jobs?

solar spire May 17, 2021, 8:11 AM

#

I am not using Entities

amber flicker May 17, 2021, 8:11 AM

#

robust scaffold Ref where? The interface between [BurstCompile]'ed code and [BurstDiscard] manag...

I do something very similar with an UnsafeHashMap - it's possible there's a safety issue when trying to do the same with a NMHM but it's worth a go. Psuedo-code:

{
  public NativeMultiHashMap myHashMap;
OnCreate -> myHashMap = new Native.... blah
OnUpdate
{
  ref var hashMapRef = ref myHashMap;
}
}```

robust scaffold May 17, 2021, 8:11 AM

#

solar spire I am not using Entities

Alright, show me your scheduling chain.

robust scaffold May 17, 2021, 8:12 AM

#

amber flicker I do something very similar with an UnsafeHashMap - it's possible there's a safe...

How is that possible? Burst complained that NMHM was not possible as the property of the struct. Are you bursting everything?

solar spire May 17, 2021, 8:12 AM

#

robust scaffold Alright, show me your scheduling chain.

https://hatebin.com/ukjvjnnoni

north bay May 17, 2021, 8:13 AM

#

The problem is that the Sort utility expects a pointer to the data but the List could reallocate the buffer anytime you add a element to it. Your best bet is to write your own job to which you pass the NativeList and then call Sort yourself. I think someone at Unity just missed that...

solar spire May 17, 2021, 8:13 AM

#

Seems pretty silly to have a dependency-based system you can't usefully use

amber flicker May 17, 2021, 8:14 AM

#

robust scaffold How is that possible? Burst complained that NMHM was not possible as the propert...

It may be you need to use an UnsafeHashMap then. Got a bunch of them in fully bursted ISBs:

#

that would make sense as it's the dispose sentinel I think that is the managed part of the default collections

robust scaffold May 17, 2021, 8:15 AM

#

solar spire <https://hatebin.com/ukjvjnnoni>

Hrm yea, as Script said, if you add or subtract anything to that list, it invalidates the list reference. Consider instead using IJobParallelForDefer and then rolling your own sorting algo.

north bay May 17, 2021, 8:15 AM

#

solar spire Seems pretty silly to have a dependency-based system you can't usefully use

        {
            public NativeList<int> ListToSort;
            
            public void Execute( )
            {
                ListToSort.Sort( );
            }
        }```

That should work fine. Dunno why the collection package doesn't do that internally

solar spire May 17, 2021, 8:16 AM

#

I'll give it a shot, thanks 🙂

robust scaffold May 17, 2021, 8:16 AM

#

Or that. Makes it simplier.

robust scaffold May 17, 2021, 8:16 AM

#

amber flicker that would make sense as it's the dispose sentinel I think that is the managed p...

hrm, that makes sense. Yea....... hrm.

amber flicker May 17, 2021, 8:24 AM

#

Yea, it's a pain. Wouldn't it be nice if the dispose sentinel was unmanaged in the next update. Wondering how that doesn't break everything though.. guess they'll have to introduce a new collection of collections? 🤔

#

Might not be worth switching to unsafe but if you're measuring times of 0.08ms, I'm guessing creating the hashmap is a note-worthy part of that.

robust scaffold May 17, 2021, 8:34 AM

#

amber flicker Might not be worth switching to unsafe but if you're measuring times of 0.08ms, ...

Yea, I'm attempting to remove the need for the NMHM entirely.

robust scaffold May 17, 2021, 8:58 AM

#

amber flicker Yea, it's a pain. Wouldn't it be nice if the dispose sentinel was unmanaged in t...

Hrm, odd. Even with UnsafeMultiHashMap, burst still can not schedule a dispose job

robust scaffold May 17, 2021, 8:58 AM

#

amber flicker Yea, it's a pain. Wouldn't it be nice if the dispose sentinel was unmanaged in t...

amber flicker May 17, 2021, 8:58 AM

#

robust scaffold Hrm, odd. Even with UnsafeMultiHashMap, burst still can not schedule a dispose j...

do you need to dispose anymore? Other than in onDestroy obviously.

robust scaffold May 17, 2021, 8:58 AM

#

This however seems internal and not something I can fix.

robust scaffold May 17, 2021, 8:59 AM

#

amber flicker do you need to dispose anymore? Other than in onDestroy obviously.

Occasionally, the capacity of the MHM must increase. It's based on the chunk count of another entity archetype.

#

I could add a check and then do a burst-discard to recreate the NMHM if the capacities are different.

robust scaffold May 17, 2021, 9:19 AM

#

From 0.08ms to 0.07ms. A 12.5% improvement

#

#

The offset job scheduling takes as long as the job itself. I haven't found a way to reduce that other than using read-write buffers and attempting to merge the scheduling, which doesnt work with a MHM being passed between the two.

amber flicker May 17, 2021, 9:25 AM

#

Yea, job scheduling and dependency chaining is a killer right now unless you're scheduling a tonne of data.

#

The dependency chaining is esp frustrating when nothing else changes. I Know it's cool to be stateless but there feels like so much of the same work done every frame when nothing changes.

robust scaffold May 17, 2021, 9:31 AM

#

amber flicker The dependency chaining is esp frustrating when nothing else changes. I Know it'...

Well, there is chunk.DidChange() or the change filter. It's very sensitive since I'm fairly certain even looking at it (using readonly getcomponent via entity reference) causes a change in chunk.

amber flicker May 17, 2021, 9:32 AM

#

robust scaffold Well, there is `chunk.DidChange()` or the change filter. It's very sensitive sin...

That's unrelated to e.g. dependency = blah

robust scaffold May 17, 2021, 9:34 AM

#

amber flicker That's unrelated to e.g. dependency = blah

Yea, the scheduling is questionable at times. I had a long writeup where I experiemented with entity component structures and manual dependency scheduling to get minimal job sync points. The main problem I found was the enforced "sync" point between system boundries. Jobs from one system must be finished before the next system jobs can run even if the various read-write dependencies dont clash. So turning of JobsDebugger and manually scheduling across systems was required.

#

I can understand why Unity did that. The order of systems are not guaranteed at runtime if there is no [UpdateBefore/After] tags but it would be nice if the automatic dependency handler would recognized when two jobs scheduled one after another can be run in parallel without having to manually use JobHandler.CombineDependencies().

#

I mean, if you read the documentation, it makes it seem like the automatic dependency handler is magic:

#

https://docs.unity3d.com/Packages/com.unity.entities@0.17/manual/ecs_job_dependencies.html

#

But if you check the profiler in practice, it's absolute shit.

amber flicker May 17, 2021, 9:39 AM

#

robust scaffold I can understand why Unity did that. The order of systems are not guaranteed at ...

I kind of agree with that (though in the context of a 'full' game or app I can see how that becomes less relevant). The part I'm talking about is the work done to a) distribute work to workers and b) evaluate those inter-job dependencies. It's the same every frame, despite often nothing changing. I understand knowing when to invalidate cache then adds a lot of complexity and it's probably smart not to have that complicate things while trying to build the core libraries.. but I hope it isn't the case forever.

robust scaffold May 17, 2021, 9:42 AM

#

amber flicker I kind of agree with that (though in the context of a 'full' game or app I can s...

Yea, Dependency can be a lot smarter. I mean, Unity already caches EntityQueries for job scheduling, why not go the next step and cache the result. People already throw around 16 GB of ram on their mobile phone, surely some of that space can be used to store scheduling data.

robust scaffold May 17, 2021, 9:44 AM

#

amber flicker I kind of agree with that (though in the context of a 'full' game or app I can s...

I also like nice solid green bars of job thread utilization. Makes me feel nice and warm inside looking at a profiler with full job utilization.

#

All the system boundaries have giant and obvious gray gaps. Makes me feel sad.

amber flicker May 17, 2021, 9:44 AM

#

As e.g. whether a job is running can change every frame, I think their preferred approach is currently to get burst working for everything - then if that work still happens fresh every frame it's no big deal. That probably is a better solution if it ever gets there/fast enough.

robust scaffold May 17, 2021, 9:45 AM

#

Oh fuck, look at the time. It's almost morning. Time to sleep.

abstract flume May 17, 2021, 11:33 AM

#

does DataFlowGraph with ECS allow doing stuff like multithreaded recursion with thread internal state?

coral nest May 17, 2021, 3:31 PM

#

Hey! whats "dots"

low hazel May 17, 2021, 3:32 PM

#

coral nest Hey! whats "dots"

https://unity.com/dots

Unity

DOTS - Unity’s new multithreaded Data-Oriented Technology Stack

With Unity’s new high-performance, multithreaded Data-Oriented Technology Stack (DOTS), you will be able to take full advantage of multicore processors and create richer user experiences and C# code that’s easier to read and reuse across.

simple falcon May 17, 2021, 3:34 PM

#

easier to read and reuse my ass

#

what a crock

karmic basin May 17, 2021, 3:40 PM

#

It's more atomic, so yeah easier to read and reuse 😛

slim nebula May 17, 2021, 3:41 PM

#

agree

karmic basin May 17, 2021, 3:41 PM

#

But yeah for a new in the team who doesnt know yet all the systems....

slim nebula May 17, 2021, 3:41 PM

#

there's def more boilerplate but... we just skim that

#

they still advertise that dotssample there tho

#

which I'm pretty sure doesn't run even with the specific version they say because their package store sends junk instead of the correct package versions when you try to load it

simple falcon May 17, 2021, 3:53 PM

#

karmic basin But yeah for a new in the team who doesnt know yet all the systems....

Yeah thats probably my problem.

crude sierra May 17, 2021, 5:14 PM

#

hey guys, if I have entities with collision filter in their physics shape that states "Belongs To: 24", how do I make the same collision filter in script?

new CollisionFilter
{
  BelongsTo: 24
}

doesn't work for some reason?

karmic basin May 17, 2021, 5:19 PM

#

crude sierra hey guys, if I have entities with collision filter in their physics shape that s...

Try BelongsTo: (uint) 1 << 24

#

or maybe (uint) (1 << 24) just to be sure

crude sierra May 17, 2021, 5:21 PM

#

karmic basin Try `BelongsTo: (uint) 1 << 24`

yeah, for some reason this doesn't work.. i'm trying to filter my raycasts. some examples online state this refers to the bodies LayerMask and not CollisonFilter?

#

my understanding here is lacking, if I want the raycast to only hit certain objects, do I specify here their layer or their collision filter?

karmic basin May 17, 2021, 5:23 PM

#

you specify the layer

#

there's BelongsTo but also CollidesWith IIRC

crude sierra May 17, 2021, 5:24 PM

#

so let's say I have a layermask, my collision filter should look like:

new CollisionFilter
{
  CollidesWith = (uint)HostileMask.value
}
``` ?

#

(this doesn't work either, btw 😦 )

karmic basin May 17, 2021, 5:25 PM

#

Well hard to debug on discord, do a test in a simple scene with an easy setup ?

crude sierra May 17, 2021, 5:26 PM

#

yes i'm doing that

#

and it should work

crude sierra May 17, 2021, 5:32 PM

#

karmic basin Well hard to debug on discord, do a test in a simple scene with an easy setup ?

are there any docs with examples regarding collision filters? I can't find any

karmic basin May 17, 2021, 5:33 PM

#

https://docs.unity3d.com/Packages/com.unity.physics@0.6/manual/collision_queries.html#filtering

crude sierra May 17, 2021, 5:35 PM

#

karmic basin https://docs.unity3d.com/Packages/com.unity.physics@0.6/manual/collision_queries...

thanks, but they are always using 0 so there's no actual filtering going on

karmic basin May 17, 2021, 5:35 PM

#

yup

#

All examples I've seen use Default and I didnt try filtering yet. Or maybe I did in the past but I dont remember sorry

crude sierra May 17, 2021, 5:36 PM

#

it would make sense if collision filters referred to other entities collision filters when filtering, rather than their LayerMask

karmic basin May 17, 2021, 5:40 PM

#

it does smthg like that with the CollisionFilter.GroupIndex

crude sierra May 17, 2021, 5:40 PM

#

I fixed it

#

!

#

var collisionFilter = new CollisionFilter()
        {
            BelongsTo = ~0u,
            CollidesWith = 1 << 24,
            GroupIndex = 0
        };

karmic basin May 17, 2021, 5:40 PM

#

If they are equal and > 0 they collide, if negative they never collide

crude sierra May 17, 2021, 5:40 PM

#

had nothing to do with LayerMasks

karmic basin May 17, 2021, 5:41 PM

#

Nice

crude sierra May 17, 2021, 5:41 PM

#

just needed to specify the other parameters.. pff

karmic basin May 17, 2021, 5:41 PM

#

Isn't it what I told you ? more or less :p

crude sierra May 17, 2021, 5:41 PM

#

karmic basin Isn't it what I told you ? more or less :p

yes, thank you 🙂

karmic basin May 17, 2021, 5:41 PM

#

Oh I see they are not facultative :p

#

IIRC same thing if you generate collider shape from code, need at least to pass quaternion.identity if you dont need some specific rotation. Or smthg along these lines, it was a long time ago not sure I remember well

versed quest May 17, 2021, 6:44 PM

#

Is dots stable? If not, when will it be

amber flicker May 17, 2021, 6:49 PM

#

versed quest Is dots stable? If not, when will it be

guaranteed by 17th August just not sure which year yet

versed quest May 17, 2021, 6:53 PM

#

Will dots support f#?

#

Natively, with functional logic, not OOP

hollow sorrel May 17, 2021, 6:55 PM

#

no

robust scaffold May 17, 2021, 7:28 PM

#

Reevaluating what data is actually being used and reorganizing the entity component structure results in over 50% job run time reduction

#

https://media.discordapp.net/attachments/497874303463850004/840314826696818698/unknown.png?width=1440&height=372

#

#

Solid green, it's beautiful.

slim nebula May 17, 2021, 7:49 PM

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that is beautiful

robust scaffold May 17, 2021, 7:53 PM

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Right, verified that all the values are changing as expected. Here's how I achieved that performance: Rotating read-write buffers and manual dependency handling.

#

A lot of my entities depend on the components changing in other entities. Normally, this would require GetComponent<>() and a series dependency chain. But do entities really need to know what the component value is this frame? Introducing: Read-Write buffers. Parent entities would write into a WriteOnly HashMap<Entity, Component> and Child entities would read from a ReadOnly similar hash map.

#

        private UnsafeMultiHashMap<Entity, int> _censusRead, _censusWrite;
        private UnsafeHashMap<Entity, float> _budgetRead, _budgetWrite;```

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At the end of the frame, the variables are swapped and the write buffer is cleared. That results in a delay of 1 frame before the child entity reads and recognizes changes to the parent entity component but that I believe is acceptable since now everything can be scheduled into a single "block".

#

#

And strangely enough, ParallelWriter has better singlethreaded WriteOnly performance than the base NativeContainer.

#

It also somehow signals to the job scheduler to merge the GetChunksAndOffset job to run in parallel with the other jobs. Otherwise, it would schedule like this:

#

#

No clue why, nothing changed other than the removal of AsParallelWriter() for a singlethreaded job

robust scaffold May 17, 2021, 11:37 PM

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hollow jolt May 18, 2021, 12:57 AM

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how to debug inside a job ?

slim nebula May 18, 2021, 1:07 AM

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hollow jolt how to debug inside a job ?

Turn off burst in top menu

glacial bolt May 18, 2021, 1:49 AM

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@gusty comet @hollow jolt There's no memes or other off-topic media

hollow jolt May 18, 2021, 1:52 AM

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slim nebula Turn off burst in top menu

i disabled burst compilation but still can't catch breakpoints

slim nebula May 18, 2021, 1:54 AM

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Not sure then. Maybe someone else knows

solid rock May 18, 2021, 1:58 AM

#

Is 0.15.0-preview.21 a recent version of Unity.Collections?

#

I'm trying to foreach a NativeArray (not in a job, it's part of my saved game system) and getting this:

Unity.Collections.NativeList`1[T].System.Collections.Generic.IEnumerable<T>.GetEnumerator () (at Library/PackageCache/com.unity.collections@0.15.0-preview.21/Unity.Collections/NativeList.cs:661)
SadnessMonday.DiscIndustries.Data.World.SystemData.PopulateFluidBuffers (System.Collections.Generic.IEnumerable`1[T] fluidBuffers) (at Assets/Scripts/Data/World/SystemData.cs:46)```

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There's no mention of this not being supported in the docs as far as I can tell 🤔
https://docs.unity3d.com/Packages/com.unity.collections@0.15/api/Unity.Collections.NativeList-1.html#Unity_Collections_NativeList_1_GetEnumerator

hollow jolt May 18, 2021, 2:23 AM

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slim nebula Not sure then. Maybe someone else knows

i suspect the is no data for the job to iterate thru

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is there a way to find out how much data does a query holds ?

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that's what i tried so far

hollow jolt May 18, 2021, 2:39 AM

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solid rock I'm trying to `foreach` a NativeArray (not in a job, it's part of my saved game ...

it should be possible to loop it normally with a for loop

solid rock May 18, 2021, 2:54 AM

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hollow jolt it should be possible to loop it normally with a for loop

It is - I'm just wondering why they bothered implementing IEnumerable if it's not implemented

#

As it is - it makes my code a bit awkward, and leaves me exposing the NativeArray directly in places I'd rather not expose it.

hollow jolt May 18, 2021, 2:58 AM

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solid rock As it is - it makes my code a bit awkward, and leaves me exposing the NativeArra...

I guess some parts of Dots is still WIP

solid rock May 18, 2021, 2:59 AM

#

hollow jolt I guess some parts of Dots is still WIP

fair enough - it is a preview package after all.

hollow jolt May 18, 2021, 4:02 AM

#

how do i get existing archetypes ?

hollow jolt May 18, 2021, 4:36 AM

#

so i tried Entities.ForEach , then* i tied IJobChunk via EntityQueryDesc but still was receiving 0 results

#

in the end i just used entity_manager.GetAllEntities(); inside mono and scanned them manually

#

which seems to do the trick

karmic basin May 18, 2021, 10:22 AM

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hollow jolt is there a way to find out how much data does a query holds ?

query.CalculateEntityCount() ?

karmic basin May 18, 2021, 10:25 AM

#

hollow jolt how do i get existing archetypes ?

https://docs.unity3d.com/Packages/com.unity.entities@0.17/api/Unity.Entities.EntityManager.GetAllArchetypes.html#Unity_Entities_EntityManager_GetAllArchetypes_Unity_Collections_NativeList_Unity_Entities_EntityArchetype__ ?

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Never tried that one don't know if it works

hollow jolt May 18, 2021, 10:38 AM

#

When setting component data "Parent" it takes the child buffer some time before it auto regenerates, is there any way to know exactly when does this would happened ? rn im waiting for next frame to continue the operation ( yield return null inside a coroutine )

#

https://github.com/stella3d/job-system-cookbook

warped trail May 18, 2021, 11:27 AM

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@hollow jolti believe it happens in endframeparentsystem🤔

remote crater May 18, 2021, 1:04 PM

#

So... for all you guys who want premade DOTS/ECS with a hybrid reference to the player so you can move it via monobehavior scripts and keep proper design patterns, this is da bomb! http://crystalfighter.com/bin/wumbla.zip

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I just did it for a guy who came on my stream, only took 3 hrs.

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Its a basic project DOTS/ECS, but also the ability to touch DOTS/ECS via Monobehaviors and singletons

#

So... for all you guys who want premade DOTS/ECS with a hybrid reference to the player so you can move it via monobehavior scripts and keep proper design patterns, this is da bomb! http://crystalfighter.com/bin/wumbla.zip

I just did it for a guy who came on my stream, only took 3 hrs.

Its a basic project DOTS/ECS, but also the ability to touch DOTS/ECS via Monobehaviors and singletons.

Its totally missing documentation:
Basically the magic is in:
Movement Data Authoring Script for Data
Identifier == 1 is the only one linked.

Identifier takes the entity and shoves it in a Singleton to reference. This is because Unity Engineers in their grand wisdom can't simply link indexes to Entities so you can drag and drop GameObjects to be converted into Entities directly into Entities.

DOTS_ID_LINKER.cs is where you manually link the number to a public static Entity in GameBoardModel(singleton)

DOTS_MATRIX.CS processes the job on the Movementdata.

ProperHyrbid/playerControls.cs shows the proper data pattern for taking a player controller on an already working game, and controlling an ECS player!!!! Just do if statements for the gametype running. This is proper design pattern, instead of many functions, write one, instead of many player controllers, write one, and branch if statements based on game mode, gameObject or Entities! This is amazing!

Of course all your enemies and other things should not be in monobehaviors, but the ECS jobs... But some things reaaaaaly need Monobehavior still, like aiming your camera, etc etc, and this shows you how to do this too.

I think this is the CORE starting place for many game devs who wanted to get into DOTS but couldn't get anything to work... This has all the packages and stuff already linked which is no trivial task.

amber flicker May 18, 2021, 1:46 PM

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remote crater So... for all you guys who want premade DOTS/ECS with a hybrid reference to the ...

disclosure: I'm heavily skeptical about this being useful or a good idea and I'm not about to download a random zip file - that said, can't simply link indexes to Entities so you can drag and drop GameObjects to be converted into Entities directly into Entities - just checking you know that if you reference a GameObject with the GenerateAuthoringComponent, it will automatically be converted to a referenced Entity. The idea being e.g within a subscene you can have references between GameObjects like normal (drag & drop). Might not be related to whatever this is but sounded like some overlap.

pliant pike May 18, 2021, 2:01 PM

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yeah I was going to say surely its better to use an open github or some other similar for something like this, random zips are highly risky

pulsar jay May 18, 2021, 3:50 PM

#

Does anybody know what DotsRuntimeBuildProfile is good for as it does not seem to be used at all. The ECSSamples build configs just use the ClassicBuildProfile (or in case of BaseBuildConfig none at all)

warped trail May 18, 2021, 3:50 PM

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@pulsar jayits for Tiny

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probably🤔

pulsar jay May 18, 2021, 3:52 PM

#

warped trail <@!189441783581638659>its for Tiny

That could be possible as I wouldnt even be able to make it work as the target dropdown does not work but it requires a target

wary anchor May 18, 2021, 3:52 PM

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Where do you begin trying to debug this warning? I looked at the docs but they don't help me track down the cause of the warning 😦


 at Unity.Entities.SystemBaseRegistry.CallForwardingFunction(Unity.Entities.SystemState* systemState, int functionIndex) (at [dir]\com.unity.entities@0.17.0-preview.41\Unity.Entities\SystemBaseRegistry.cs:307)
 at Unity.Entities.SystemBaseRegistry.CallOnUpdate(Unity.Entities.SystemState* systemState) (at [dir]\com.unity.entities@0.17.0-preview.41\Unity.Entities\SystemBaseRegistry.cs:346)
 at Unity.Entities.SystemBase.UnmanagedUpdate$BurstManaged(System.IntPtr pSystemState, ref Unity.Entities.SystemDependencySafetyUtility.SafetyErrorDetails errorDetails) (at [dir]\com.unity.entities@0.17.0-preview.41\Unity.Entities\SystemBase.cs:464)
 at Unity.Entities.SystemBase.Unity.Entities.UnmanagedUpdate_00000F27$BurstDirectCall.Invoke(System.IntPtr pSystemState, ref Unity.Entities.SystemDependencySafetyUtility.SafetyErrorDetails errorDetails)
 at Unity.Entities.SystemBase.UnmanagedUpdate(System.IntPtr pSystemState, ref Unity.Entities.SystemDependencySafetyUtility.SafetyErrorDetails errorDetails) (at [dir]\com.unity.entities@0.17.0-preview.41\Unity.Entities\SystemBase.cs:445)


While compiling job: System.Boolean Unity.Entities.SystemBase::UnmanagedUpdate(System.IntPtr,Unity.Entities.SystemDependencySafetyUtility/SafetyErrorDetails&)
at [dir]\com.unity.entities@0.17.0-preview.41\Unity.Entities\SystemBaseRegistry.cs:line 307

#

Oof wall of error lol

karmic basin May 18, 2021, 4:50 PM

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https://docs.unity3d.com/Packages/com.unity.burst@1.5/manual/docs/Warnings.html#bc1371

amber flicker May 18, 2021, 5:42 PM

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wary anchor Where do you begin trying to debug this warning? I looked at the docs but they d...

One time I've seen a similar error is I think trying to use ISystemBase with a non IJobChunk (e.g. IJobEntityBatch)

wary anchor May 18, 2021, 6:27 PM

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karmic basin https://docs.unity3d.com/Packages/com.unity.burst@1.5/manual/docs/Warnings.html#...

Yeah as I said in my post, I already read that but it offers no help as to working out where the issue is

wary anchor May 18, 2021, 6:27 PM

#

amber flicker One time I've seen a similar error is I think trying to use ISystemBase with a n...

It's all just SystemBase, no separated jobs outside of Entities 😦

wary anchor May 18, 2021, 6:48 PM

#

If only it gave even just a system to look within it would help :(

robust scaffold May 18, 2021, 7:43 PM

#

wary anchor Where do you begin trying to debug this warning? I looked at the docs but they d...

Hrm, a burst warning. Does it still occur after a restart of the editor?

wary anchor May 18, 2021, 7:45 PM

#

Yes, it only appears on build though

amber flicker May 18, 2021, 8:42 PM

#

wary anchor Yes, it only appears on build though

Using any generics?

wary anchor May 18, 2021, 8:49 PM

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@amber flicker nope 😦

robust scaffold May 19, 2021, 1:48 AM

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wary anchor Yes, it only appears on build though

Right, I just built my project that uses multiple unmanaged ISystemBase systems for the first time and didn't experience this error. Have you narrowed it down to something specific?

robust scaffold May 19, 2021, 1:57 AM

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wary anchor Yes, it only appears on build though

Wait hrm, I build using Debug release because I use virtual texturing and HDRP does not properly compile virtual textures in release or master builds so no clue. Have you tried building in Debug mono/il2cpp versions? Attempt Mono first as that does not strip code.

robust scaffold May 19, 2021, 3:19 AM

#

Unity Plz: Reinterpret method for NativeArrays.

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GetDynamicComponentDataArrayReinterpret The fuck is this? No documentation at all but it may be what I want.

robust scaffold May 19, 2021, 3:52 AM

#

The method's code looks fairly complex but I trust unity to have optimized it to hell and back for Burst.

#

Yea, it's what I expected it to be. Probably what is used in the generation of the Entities.ForEach code. But my god my eyes bleed looking at the giant method name.

#

In fact, chunk.GetDynamicComponentDataArrayReinterpret() has the exact same backing code as chunk.GetNativeArray(), just the type is obtained from different places.

#

And thus by the power bestowed upon me by Bill Gates himself, I say Fuck You Unity and rewrite the method name:

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public static NativeArray<T> GetArrayReinterpret<T>(this ArchetypeChunk chunk,
    DynamicComponentTypeHandle handle) where T : struct
{
    return chunk.GetDynamicComponentDataArrayReinterpret<T>(handle, UnsafeUtility.SizeOf<T>());
}```

untold night May 19, 2021, 6:31 AM

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There is a Reinterpret<T> method for native arrays. No need to jump thru hoops:

var previousData = batchInChunk.GetNativeArray(PreviousCharacterCollisionDataHandle).Reinterpret<CharacterCollisionData>();

Normal ComponentTypeHandle<T> and everything

robust scaffold May 19, 2021, 6:47 AM

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untold night There is a Reinterpret<T> method for native arrays. No need to jump thru hoops: ...

Wait what.

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Arg, making me get out of bed and squint at the bright computer monitor just to see if that is true...

robust scaffold May 19, 2021, 6:49 AM

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untold night There is a Reinterpret<T> method for native arrays. No need to jump thru hoops: ...

I am blind. Fuck. Thanks.

untold night May 19, 2021, 7:03 AM

#

it's also on DynamicBuffer<T> too. For the exact same reasons

pulsar jay May 19, 2021, 9:29 AM

#

Does anybody have experience with creating custom build pipelines. At first it seems to be extensible as you could derive from ClassicNonIncrementalPipelineBase and build your own pipeline from a list of build steps. But then there is no way for it to be 'selected' easily as they just use an instance of the first found class derived from ClassicNonIncrementalPipelineBase

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It looks to me like the only way to use a custom pipeline is to also create a custom build profile (IBuildPipelineComponent) and a custom BuildPipelineSelector which would be mostly copy/paste

#

It seems to be even more annoying as all the existing build steps are private. So I cannot even use them in a custom pipeline 😣

north bay May 19, 2021, 3:57 PM

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New DOTS subforum https://forum.unity.com/threads/welcome-to-the-dots-graphics-forum.1098169/

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The post was made on the 23 April that's quite a big jump from the time of setting the forum public lol

karmic basin May 19, 2021, 4:00 PM

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That's a 2-sprints latency 😛

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or anticipation, I dunno 🤔

amber flicker May 19, 2021, 4:03 PM

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north bay The post was made on the 23 April that's quite a big jump from the time of setti...

practically realtime on dots timescales

wanton plank May 19, 2021, 4:16 PM

#

can you use unity dots jobs with the build in renderer or is that only available to urp / hdrp ?

deft stump May 19, 2021, 5:08 PM

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u can

robust scaffold May 19, 2021, 5:55 PM

#

#

Hrm. I can't say if half a year to annual release schedule is "landing all the time" but whatever you say Unity.

safe lintel May 19, 2021, 6:02 PM

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landing all the time but only gets released with the main entities package it appears

robust scaffold May 19, 2021, 6:11 PM

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safe lintel landing all the time but only gets released with the main entities package it ap...

It's actually a blessing in disguise. I've really gotten to learn the various quirks and syntax of fairly obscure parts of the ecosystem. I would imagine some would get thrown out the window next decade when the next release finally gets shipped to the public but I'm actually getting shit done rather than wondering through and getting sidetracked with the newest feature.

safe lintel May 19, 2021, 6:13 PM

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id rather have frequent updates 🤷‍♂️

robust scaffold May 19, 2021, 6:13 PM

#

I would settle for even less. Someone from Unity to finally recognize DOTS existence again.

#

Also note: DynamicBuffers have terrible performance. I'm half convinced it's just a thin wrapper around a component with an UnsafeArray property.

safe lintel May 19, 2021, 6:18 PM

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well you got your wish, updates are really slowing down from once every other week, to once a month and now its looking to be once or twice a year

wanton plank May 19, 2021, 6:48 PM

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deft stump u can

im glad cuz i despice urps limitations and hdrp is unfinished / overkill

hollow sorrel May 19, 2021, 7:47 PM

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@robust scaffold terrible performance compared to what?

robust scaffold May 19, 2021, 8:05 PM

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hollow sorrel <@!262065945936134144> terrible performance compared to what?

Basic blittable components. Just getting an empty size 0 Buffer on a component takes as long as iterating through a set of float components with random read-write with another entity.

robust scaffold May 19, 2021, 8:08 PM

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hollow sorrel <@!262065945936134144> terrible performance compared to what?

Which is why I'm convinced that DynamicBuffers are just a fancy version of a regular component with a UnsafeList pointer property. Best practice is to avoid using UnsafeX as properties in components because they wreck the cache alignment since they're pointers to distant places in the memory and not nearby in the various CPU level cache.

hollow sorrel May 19, 2021, 8:08 PM

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it depends what you set as capacity

robust scaffold May 19, 2021, 8:09 PM

#

InternalBufferCapacity(0) and a TrimExcess() on creation. Nothing in the buffer.

hollow sorrel May 19, 2021, 8:10 PM

#

so you're not fetching any elements? just fetching the dynamicbuffer itself is slow?

robust scaffold May 19, 2021, 8:10 PM

#

The job just checks if the buffer IsEmpty. No elements. IsEmpty is a property on the DB.

hollow sorrel May 19, 2021, 8:10 PM

#

oh that's weird

robust scaffold May 19, 2021, 8:10 PM

#

Well, it doesnt even branch, if or if not it IsEmpty, it returns.

hollow sorrel May 19, 2021, 8:11 PM

#

wonder why that'd be slower than a regular component

#

btw checking if an UnsafeList on a component is empty should be just as fast as a regular component too

#

you wouldn't need to go outside the chunk for that

robust scaffold May 19, 2021, 8:12 PM

#

untold night May 19, 2021, 8:13 PM

#

it's not an unsafe list internally per-se, but it's not far off.

It'll use the internal capacity buffer list on the component itself, and then when exceeded will swap to a dynamically allocated buffer.

setting the capacity to 0 forces it to be dynamically allocated ALL THE TIME

hollow sorrel May 19, 2021, 8:13 PM

#

yea but the length should still be a struct field so if you're just checking isempty should be the same

robust scaffold May 19, 2021, 8:14 PM

#

Hrm yea, but I'm not adding anything to the buffer in the first place.

#

untold night May 19, 2021, 8:14 PM

#

also, if you're measuring in the editor, make sure the leak detection setting is either on or off, not full.

You may also be getting overhead from the container safety checks

robust scaffold May 19, 2021, 8:15 PM

#

Nah, it's just plain on but this is a bursted system. Leak detection is automatically off.

untold night May 19, 2021, 8:15 PM

#

leak detection is not automatically off in a burst system in the editor

#

you have to manually disable it as a global setting

#

and DynamicBuffer is treated like NativeArray and has safety checks

robust scaffold May 19, 2021, 8:17 PM

#

#

Doesnt seem to have changed anything with it off.

#

Still averaging ~0.03 per thread for doing nothing but accessing.

#

Hrm, that may just be overhead

untold night May 19, 2021, 8:19 PM

#

they have said there's some job and data access overhead they're working on optimizing out now that burst is fairly stable.

Also the safety system currently uses managed objects at various points, I know they said somewhere they wanted to make it purely unmanaged.

That overhead should dissappear outside the editor

#

as the safety checks and additional editor overhead doesn't exist in a built player

north bay May 19, 2021, 8:21 PM

#

Anyone knows if DOTS Netcode already supports ghost ownership transfers?

robust scaffold May 19, 2021, 8:25 PM

#

#

#

Yea, it's the buffer access. Hm. Well, I really cant do anything about it. I need a dynamic resizable list and I would imagine Unity at least attempted to optimize DynamicBuffer rather than just porting over UnsafeList.

#

Well, technically I could go around malloc myself a fixed sized struct to use as a "list". I know FixedList<> is one of them.

untold night May 19, 2021, 8:28 PM

#

I mean, if it's really bothering you, you could put this stuff in an ISystemStateComponent that contains an UnsafeList<T>, alloc when the ISystemStateComponent is added, dealloc when ISystemStateComponent goes out of scope.

I've played with this before and it seems to work ok. You just HAVE to make sure you clean everything up properly.

#

FixedList would work but it could bloat your component size and cause fragmentation

#

depends on capcity size

robust scaffold May 19, 2021, 8:30 PM

#

True, although I may be going counter to best practices. I actually want boated size as I need my chunks to fragment. I'm currently using a chunk component as a "regional" bank and already fragmented my entities using a shared component so the chunk utilization is already awful.

untold night May 19, 2021, 8:30 PM

#

ultimately the best approach may be to try all of them and measure it out.

#

ah

robust scaffold May 19, 2021, 8:30 PM

#

Still, the performance is amazing. Memory usage, not so much.

#

Still the memory usage pales in comparison to the four 16k x 8k textures I have plastered on the screen at all times.

#

What I have to ask is: Why Unity does the FixedLists go from 128 to 512. I need more than 15 elements but not 63 of them. What's wrong with 256?

robust scaffold May 19, 2021, 8:47 PM

#

untold night I mean, if it's really bothering you, you could put this stuff in an ISystemStat...

And oh yea, I'm doing that already with the references to BlobAssets. I really dont want to create unique disposal system for every singleton containing a BlobAssetReference so I just use a sharedsystemstatecomponent with a List<IDisposable>.

karmic basin May 19, 2021, 8:47 PM

#

north bay Anyone knows if DOTS Netcode already supports ghost ownership transfers?

You mean on connection lost ? Never saw anything about that, think you have to implement yourself. Maybe it's too soon.

north bay May 19, 2021, 8:51 PM

#

karmic basin You mean on connection lost ? Never saw anything about that, think you have to i...

In my case a stationary weapon that can be entered by a player who should then start predicting it.
My current approach for this has been to create a separate predicted entity that gets instantiated once a player enters it and despawns when he leaves it.
I was just wondering if Unity already allows for changes to the GhostOwnerComponent after spawn. I know that wasn't possible a year ago and I haven't checked it since.

robust scaffold May 19, 2021, 8:53 PM

#

north bay In my case a stationary weapon that can be entered by a player who should then s...

https://docs.unity3d.com/Packages/com.unity.netcode@0.6/changelog/CHANGELOG.html

#

Nothing in the changelogs to indicate the situation has changed within the last year

north bay May 19, 2021, 8:55 PM

#

Yea.. It's probably still determined when initially spawning the ghost

robust scaffold May 19, 2021, 8:59 PM

#

Not good. Although I need to compare to a DynamicBuffer with size 16.

hollow sorrel May 19, 2021, 9:02 PM

#

that's a lotta dividends

robust scaffold May 19, 2021, 9:02 PM

#

Just slightly worse.

#

It's about 12k entities, each with a dynamic buffer of size 16.

karmic basin May 19, 2021, 9:03 PM

#

north bay In my case a stationary weapon that can be entered by a player who should then s...

Can you handle it as any other weapon ? But everyone has one, kinda hidden, and you auto switch to it when a player enters the turret 🤷‍♂️

north bay May 19, 2021, 9:10 PM

#

karmic basin Can you handle it as any other weapon ? But everyone has one, kinda hidden, and ...

I'll stick with my current approach of having the standard interpolated entity and a client predicted one that is dynamically spawned.
It worked fine so far I was just hoping that they simplified the process by now.

Thanks for the suggestion tho 🙂

robust scaffold May 19, 2021, 9:11 PM

#

I swear I read this somewhere but a dynamic buffer containing an entity reference (entity property) will have that element destroyed when the entity it references is destroyed. All I can find is HasEntityReference on the ComponentType but nothing uses it.

north bay May 19, 2021, 9:12 PM

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That would be a crazy design choice and break a lot of stuff I'm doing in my code base

#

It's only the LinkedEntityGroup that destroys it members when being destroyed

robust scaffold May 19, 2021, 9:12 PM

#

Hrm, guess not then. Huh.

warped trail May 19, 2021, 9:38 PM

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@robust scaffoldthere is chunk.GetUntypedBufferAccessor😅

#

and this accessor has GetBufferLength() method🤔

deft stump May 19, 2021, 11:12 PM

#

safe lintel well you got your wish, updates are really slowing down from once every other we...

at this point, updates would prolly be once every 2 years by 2022

robust scaffold May 20, 2021, 12:36 AM

#

Why is ISystemBaseStartStop Internal?

#

I suddenly realized the existance of unmanaged OnStartRunning and OnStopRunning yet Unity made it internal. Why?

deft stump May 20, 2021, 1:02 AM

#

I should start practicing my dots again.

I haven't touched my dots project in so long

coarse turtle May 20, 2021, 1:08 AM

#

robust scaffold I suddenly realized the existance of unmanaged OnStartRunning and OnStopRunning ...

I wonder about that too - but considering the limits of ISystemBase not generally surprised it's not* publicly available

robust scaffold May 20, 2021, 1:12 AM

#

coarse turtle I wonder about that too - but considering the limits of ISystemBase not generall...

I actually copied over the Entities package and made ISystemBaseStartStop public. OnStartRunning and OnStopRunning dont actually get called. They aren't hooked up somewhere to the event system.

coarse turtle May 20, 2021, 1:12 AM

#

Ah...that's a shame

untold night May 20, 2021, 3:25 AM

#

ISystemBase is apparently going to be ready for use in the next release

whenever that happens to be

robust scaffold May 20, 2021, 4:07 AM

#

Exactly, whenever that happens

#

#

Also, damn. My bigbrain shared component filter job scheduling is not so big brain.

safe lintel May 20, 2021, 5:04 AM

#

untold night ISystemBase is apparently going to be ready for use in the next release wheneve...

just like enable/disable right?

safe lintel May 20, 2021, 5:04 AM

#

deft stump at this point, updates would prolly be once every 2 years by 2022

thats what im fearing

untold night May 20, 2021, 5:27 AM

#

honestly, I feel enable/disable is probably farther out than ISystemBase

#

ISystemBase implementation gets immediate gains to scheduling performance and System overhead.

They've already done a lot of the lead work by converting more of the EntityManager and EntityQuery stuff to structs instead of value types.

enable/disable is more of a "nice-to-have" that happens to have the bonus of being familiar to most existing Unity users, and it's main perf benefit is fewer structural changes & being able to skip disabled entities for processing.

safe lintel May 20, 2021, 5:45 AM

#

the current rate of updates makes it hard for me to judge how things are shaping up now tbh

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also the original estimation was 3weeks to 3months last year at this time(welp), im not upset that its taking longer, just that everything seems to be slowing down (from my perspective)

minor sapphire May 20, 2021, 10:18 AM

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Oh man same. They clearly have messed something up cadence/compatibility wise. Makes you wonder how many years it will be until we get past experimental and preview on the core, let alone the surrounding features like animation/audio/particles/vfx

north bay May 20, 2021, 10:26 AM

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I always wondered if it wouldn't be simpler to make a DOTS branch of Unity to begin way.
That way compatibility issues would be instantly visible when merging new engine features and the DOTS packages could be shipped in lockstep with a version they know works.

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The release cycles have slowed down like crazy since the last year which is pretty frustrating when Unity staff tells you they fixed something but you still have to wait 4 months before you can try the fix out..

mint iron May 20, 2021, 11:24 AM

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agreed Script, this has been the biggest problem from my experience, matching editor versions with package versions. There is no way to know which editor you need for a specific version of the packages or dependency packages. Which works fine if you're always on the cutting edge latest version, but that's not always practical.

frosty siren May 20, 2021, 11:32 AM

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north bay The release cycles have slowed down like crazy since the last year which is pret...

imagine reading changelog after next release

karmic basin May 20, 2021, 12:55 PM

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mint iron agreed Script, this has been the biggest problem from my experience, matching ed...

This doesn't help ? https://docs.unity3d.com/Manual/pack-safe.html

half jay May 20, 2021, 12:58 PM

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Does Entities.ForEach().ScheduleParallel will parallel by Chunk ?

amber flicker May 20, 2021, 1:07 PM

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half jay Does Entities.ForEach().ScheduleParallel will parallel by Chunk ?

Yes I think it still just compiles down to an IJobChunk basically.

pliant pike May 20, 2021, 2:48 PM

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is there some weird rule with EntityManager.AddComponent() that if the entity already has that component then it just picks another entity to add the component to, by incrementing or decrementing

amber flicker May 20, 2021, 2:59 PM

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pliant pike is there some weird rule with EntityManager.AddComponent() that if the entity al...

Highly unlikely. If the component exists already it just does nothing afaik.

pliant pike May 20, 2021, 3:01 PM

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yeah I don't then I must have some weird case where entityquery arrays arent aligning, I guess I'll stick to a boolean then, thanks

amber flicker May 20, 2021, 3:01 PM

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don't forget that if you make any structural changes (e.g. add component), queries won't return the same entities in the same order

pliant pike May 20, 2021, 3:03 PM

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that's probably why then

pliant pike May 20, 2021, 3:24 PM

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another basic question but are you only able to change components with setcomponent now

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GridSpaceOccupied temprgid = new GridSpaceOccupied();
temprgid = tempGridocced[tompvool];
temprgid.boolValue = false;
tempGridocced[tompvool] = temprgid;```

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you can't do something like that to set a component 😕

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well nevermind setcomponentdata doesn't work at all either

warped trail May 20, 2021, 3:38 PM

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can you show more?😅

pliant pike May 20, 2021, 3:38 PM

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dots really is annoying sometimes, the simplest things I cannot get to work sometimes

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have to go to work now, will have to try and figure it out later, thanks for the offer though

north bay May 20, 2021, 3:43 PM

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Make sure you are not overwriting the value somewhere else

robust scaffold May 20, 2021, 9:37 PM

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https://forum.unity.com/threads/is-the-a-guide-for-performance-tuning-with-hybrid-renderer.1001293/#post-7158139

Unity Forum

Is the a guide for performance tuning with Hybrid Renderer?

Are there any guides or documentation for tuning performance with the Hybrid Renderer? I've been searching around the documentation and forum and I...

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Some good tips from Unity themselves in this thread. Even if you're not using Hybrid Renderer but still would like to profile Entities like me.

boreal bobcat May 20, 2021, 10:21 PM

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Hello, does anyone know what causes this EditorOnly DisposeSentinel thingy and how I can disable it? I'm scheduling a job in Update (MonoBehaviour + Burst (no ECS)). In that Update I'm also creating 2 native array which are most probably the performance hit

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It seems like this thing only happens in the editor, hence why it's called like that lol