archived-dots

[rotund token]

not sure it'd make much difference though tbh

[covert lagoon]

There's no manual for Entities 0.51: https://docs.unity3d.com/Packages/com.unity.entities@0.51/manual/index.html

[rotund token]

but i guess if stuck worth a try

[rotund token]

it takes them a while to get all the documentation pushed

there is likely very few if any changes though

[rustic rain]

wait what

[covert lagoon]

But it's already available in the package manager?

[rustic rain]

is it released?

[rotund token]

yes

[covert lagoon]

I can use DOTS with Unity 2021 now?

[rustic rain]

so, what version is stable now?

[rotund token]

upgrading project atm, we'll find out

[rustic rain]

any links to official source?

Can't find it in google

[rotund token]

i will say they have broken a bunch of my tooling

[Obsolete("UnsafeHashMap is renamed to UnsafeParallelHashMap. (UnityUpgradable) -> UnsafeParallelHashMap<TKey, TValue>", false)]

[Obsolete("NativeHashMap is renamed to NativeParallelHashMap. (UnityUpgradable) -> NativeParallelHashMap<TKey, TValue>", false)]

=S

[viral sonnet]

interesting 🙂 just a rename? need to make some diff

[rustic rain]

I don't get it, what version do I need? xD

[covert lagoon]

https://github.com/needle-mirror/com.unity.netcode/

0.51 was made on May 4?

[rotund token]

0.50/0.51 is still based on an internal state of from memory like september last year

there wasn't much that needed to change 0.51 to make it work in 21 as far as i can tell, it's mostly editor side of things

[covert lagoon]

Ok

[tranquil jay]

Strange, 2021.3.3 works to install but 2021.3.4 does not

i dont know how to get into 3.2.0 hub

[rotund token]

bottom left is a switch channel button or something i think

[tranquil jay]

found it ty

[viral sonnet]

it's just a rename. I'm honestly not amused about calling something Parallel that has shitty performance and uses Interlocked

[covert lagoon]

uses Interlocked
What do you mean?

[rotund token]

Enzi 2 months ago - interlock everything
Enzi today - interlock is the devil
🤣

i get the concern though

but to be fair, for most applications it's pretty fast

[viral sonnet]

haha, I never said interlock everything 😄 only if it's faster in practice than other solutions.

[rotund token]

ok project compiling

in 2020.3

time to upgrade

[viral sonnet]

NativeCollections and their ParallelWriter are really slow because they rely on Interlocked to keep thread safety. It's for most containers, only NativeStream is truly parallel

[covert lagoon]

You mean mutexes?

[viral sonnet]

just test a NativeList.Add in parallel and then in single thread. single thread runs many times faster. - Isn't atomic operations the general term? Mutex is like the old version of interlocked i think

[covert lagoon]

This is the first time I hear interlock instead of mutex or just lock

[rustic rain]

sirs. Is new target version of unity known yet?

[rotund token]

NativeQueue only interlocks on allocating a new block per thread

it has a block per thread and only if it runs out of space it needs to allocate a new one

[viral sonnet]

            // a non-null head which means we need to do more checks...
            if (Interlocked.CompareExchange(ref buckets[bucket], idx, -1) != -1)``` check the source, it's used a lot. - Yeah NativeQueue is also block based.

[covert lagoon]

From what I've seen, NativeQueue is not a circular list but a list of blocks, is that correct?

[rotund token]

everyone forgets about the poor nativequeue, the original boy

[covert lagoon]

Does that help with performance when adding/removing elements because you don't have to allocate as much memory when growing the capacity?

Also, how do you implement parallel writing to a data structure without mutexes?

[rotund token]

well there's a very simple example - an array of lists

1 list per thread

but yes for anything more complicated than just that you do need something

[covert lagoon]

How do you know in advance how many lists you'll want?

[rotund token]

there are only 128 worker threads

you create 128

JobsUtility.JobWorkerCount

[covert lagoon]

Ok

[rotund token]

ok upgrade hasn't gone so well so far

[silk current]

Hey guys, is it known what GameObjectConversionUtility.ConversionFlags.ForceStaticOptimization exactly does?

[rotund token]

1 error a frame about replacing code gen in the hybrid renderer package

time for a nuke

[rotund token]

i believe this is the same as using StaticOptimizeEntity

which removes translation/rotation

adds Static component

so it should only be left with LocalToWorld which won't update

[silk current]

Oooooh, I see!
How about SceneViewLiveConversion and GameViewLiveConversion?

[rotund token]

those are for subscenes

to determine what view you see

you shouldn't touch that i don't think, as it's just part of the subscene conversion stuff

(well you shouldn't touch GameObjectConversionUtility either imo 😆 )

[silk current]

oooh, really? why, and what would be the alternative?

[rotund token]

subscenes

runtime conversion is not great

[silk current]

I need to convert a prefab gameobject to spawn it randomly during gameplay
the gameobject has a ConvertToEntity component, but I haven't figured out yet how to do it from code

what could I use?

I'm using EntityManager.Instantiate(Entity, int, Allocator) to spawn it right now

[tranquil jay]

Anybody >.>

[silk current]

I need a couple thousand and quickly, so GameObject.Instantinate isn't a good idea

[rustic rain]

the simplest way: create some component with entity field and [GenerateAuthoringComponent]

[rotund token]

I would make sure it's not blocked by windows defender or other anti-virus configurations

[rustic rain]

then just assign GameObject prefab to serialized field

[tranquil jay]

i have

[rustic rain]

and future entity will be Entity prefab

[rotund token]

it kind of sounds like (based off your previous issue) that the exe is just being nuked

when it's downloaded

[rotund token]

you create all your prefabs in a subscene

and then just instantiate what you need at runtime

2021.3.4 + 0.51 in project is a go! (just needed a library deletion...)

wait nevermind still having issues on codegen

😦

[covert lagoon]

(just needed a library deletion...)
What do you mean?

Oh

[silk current]

I'm not sure I understand tbh
I have a prefab, which I locate with Resources.load
then I convert it to entity with GameObjectConversionUtility.ConvertGameObjectHierarchy
then I instantinate it with EntityManager.Instantiate(Entity, int, Allocator)

also, I must use 2020.3

[covert lagoon]

The Netcode for Entities manual has taught me to do it another way

[rotund token]

yes this is not a good entities flow

[covert lagoon]

The Netcode for Entities manual has taught me to do something like this:

[GenerateAuthoringComponent]
public struct PlayerSpawner : IComponentData
{
    public Entity Prefab;
}

Then you create an empty GameObject in a subscene, give it this authoring component, and set the prefab GameObject you want

The prefab GameObject is seemingly converted to a prefab entity

[silk current]

ah
wait
so you attach the GameObject prefab to Entity field?

[covert lagoon]

In your code you do GetSingleton<PlayerSpawner>().Prefab and you have your prefab entity

[covert lagoon]

I think in the generated authoring component, the field's type is GameObject instead

I don't see how else it would work

[silk current]

uuuuuuu, I see
that's a cool solution indeed, much better than what I have

alright, I'll try this now then

[covert lagoon]

But you'll also need to add RequireSingletonForUpdate<PlayerSpawner>() in your system's OnCreate() so your system doesn't run before the PlayerSpawner singleton is loaded from the subscene

And if you add that call to RequireSingletonForUpdate<T>() in your OnCreate(), then I think you need to explicitly list all your other requirements too, they won't be automatically generated from your entity queries anymore

Entities 0.51 docs are out: https://docs.unity3d.com/Packages/com.unity.entities@0.51/manual/index.html

[rotund token]

bugger - 0.51 + 2021.3.4 runs fine for my save library

just my game that has code gen issues

[rustic rain]

2021.3.4+

3.4+

huh

[rotund token]

?

[rustic rain]

oh

I didn't realise

it is latest 2021

xD

all right, time to break my project too

[hot basin]

AT LAST

do anyone have any problems with upgrading?

it will take me awhile as I need to do whole 0.17->0.50 upgrade guide

[rustic rain]

seems pretty simple

most problems are from native packages

like input/Ui

[rotund token]

i'm seeing some weird issues with netcode

get an error on codegen preventing doing anything on a library that has no netcode in it

but another library references it that does use netcode

and it wont compile/codegen until the first library gets a reference to netcode even though it doesn't use it =S

[hot basin]

but only with netcode?

I don't see the option for adding partial keyword

funny thing

can't see it because it don't compile

why it don't compile? because of missing partial word

[rotund token]

🤣

yeah it needs to compile once

[hot basin]

I have error with conversion of buffer element with entity field

[silk current]

Hey, is there a way to get an Entity field in the inspector of a MonoBehaviour?

I know you can get it on a struct with [GenerateAuthoringComponent], but I was wondering about a monobehaviour

[hot basin]

you can't as how exacly you want to set it up?

I mean, Entity on the component is just a prefab/GameObject as it would be converted

and how should Entity field work in MB?

you can always have GameObject field and convert it by hand

[silk current]

I want to have a singleton monobehaviour, from which a system gets the Entity prefab to instantinate

I was told converting by hand is bad?

[hot basin]

you can always make singleton component

with entity field

[silk current]

oh, yeah, I suppose
damn, I didn't think of that

that solves my problem, although it's a bit silly xd

[hot basin]

and use RequireSingletonForUpdate<>();

[silk current]

that's my plan, yea

although... I kinda need the prefab in OnCreate

so ikd

idk

[hot basin]

I think OnCreate is after conversion?

maybe not

[silk current]

I don't know, but since OnCreate is before OnUpdate, then I guess I don't really need to RequireSingletonForUpdate...

since I need the singleton before it anyway

doesn't matter I guess

[hot basin]

have anyone errors in runtime with converted IBufferElement with Entity field?

[GenerateAuthoringComponent]
    public struct SpawnerEntityReference : IBufferElementData
    {
        public Entity entity;
    }

[rustic rain]

Getting access to entities during OnCreate phase is not reliable

I suggest use RequireSingleton

and getting one time thingies related to that singleton in OnStartRunning

[silk current]

Out of curiosity, does pausing and unpausing the game in Unity invoke OnStartRunning and OnStopRunning?

[rustic rain]

subscenes usually load only after a bit of time after world started running

[rustic rain]

pausing in what way?

from what I noticed

[rustic rain]

nnah

from what I noticed

they are only invoked if queries changes

as in, if system requires singleton

it will do oNstartrunning only after it appeared in world

[rotund token]

technically start running is invoked if the previous frame system didn't run and the next it did

[rustic rain]

and onstoprunning after it dissappeared

[rotund token]

(or on first frame)

99% of the time this is from queries as you say

but it can be from Enabled toggling etc

[rustic rain]

I don't trust Enabled toggling xD

to me it's only debugging tool

[rotund token]

oh i don't think it should be used to toggle

[silk current]

as long as it's before OnUpdate, I'm good xd

[rotund token]

but disabling a system perm is useful

if you all care about is OnCreate

[rustic rain]

I really like your idea about using entities as state defines, btw

Kind of curious whether with increased shared comp capacity

I could use one shared component and use it's filter for state requirement on systems

[viral sonnet]

what's so great about it? seems over engineered on paper. 🤔

[rustic rain]

allows you to use all power of OnStartRunning

[viral sonnet]

i dunno, it just moves a if to someplace else?

[rustic rain]

switching states of game becomes very simple

and doesn't rely on other modules

Allthough it does raise a question, whether it's perfomance justified

[viral sonnet]

don't get me wrong, it sounds convenient. if it's not too many systems even perf wouldn't be a problem. still I think an easier, equally convenient solution can be made with sharedstatic or smth

[rustic rain]

well, in case of a lot of similiar cases

[viral sonnet]

is newtonsoft json now totally gone from 0.51?

[rustic rain]

when systems would require same component

I could just create group with that requirment

kek

[viral sonnet]

great, I see a lot more caching in low level entities methods

[silk current]

what do I need to do, to be able to use this code without writing WithoutBurst() at the end?
I can't really tell what isn't allowed, aside from the fact that any line of this code produces the error

[hot basin]

cache Time.DeltaTime outside of ForEach

are components structs or classes?

[silk current]

all structs

[hot basin]

i don't know about that Vector3

you can use float3.up

was it helpful?

[silk current]

unfortunately problem still appears

[hot basin]

what error says

[silk current]

googling didn't help unfortunately

[hot basin]

show new code

[rustic rain]

You can't use properties in lambda

[rustic rain]

Prep your variables before for each loop

[silk current]

oh my

[silk current]

yea

I just noticed

that

It works after fixing that

damn

[hot basin]

👌

[silk current]

ouch, so Random.NextFloat is also a no-go?

[hot basin]

ok i'm giving up, don't know why it's broken and how to fixed it

[rustic rain]

Dots has it's own random

[hot basin]

use Mathematics

[silk current]

yea yea, I know. That's what I'm using

[hot basin]

you need to make random variable before foreach

[silk current]

I have it

[hot basin]

I think I just lied to you 😛 you don't have to do it before in case of Mathematics.Random

[silk current]

either way, I think using random breaks it. Imma check

[rustic rain]

I put my random on entities

[hot basin]

I'm using random system with number of random variables

[rustic rain]

So each entity has it's own random

[hot basin]

it was posted on the forum while ago

[viral sonnet]

the safety system got a bit more dumb. can't use a NativeList in a scheduled IJobParallelForTransform

[silk current]

I don't need that, since I only use it to generate random positions basically

and rotations speeds xd

I commented out the calls to random and it still screams :/

[viral sonnet]

my project runs fine now in 2021.3.4f1 and entities 0.51

[silk current]

oooh, I probably can't reference global objects, can I

[hot basin]

do you have Buffers with Entity field?

[silk current]

as in variables in the class

[rustic rain]

No static in lambda either

[silk current]

still doesn't work wth

OUCH

I figured this out

I can't use functions

from the class

[rustic rain]

Only static methods work

[viral sonnet]

no, I phased out pretty much all buffers. do you have problems with them?

[silk current]

oo, yea I guess so?

[hot basin]

yeah, here

[rustic rain]

Make it static

[silk current]

hell yeaaaaaaa

finally works

[viral sonnet]

oh, that's odd. hm

did you try without the tag?

[hot basin]

do you mean [GenerateAuthoringComponent]?

[viral sonnet]

yeah, rewrite to IConvertGameObjectToEntity

[hot basin]

it's last thing I didn't try as I have quite a lot of buffers

[viral sonnet]

oh boy ^^

[hot basin]

with what did you replace DB?

[viral sonnet]

hashmaps

doesn't mean it will fit in your case. hashmaps is also not quite true. mostly they are linear key/value arrays that are indexed

[silk current]

does anyone have any idea why GetSingleton is claiming that there are 0 instances of a singleton, when it clearly is in the loaded scene? It doesn't exist even after waiting a while...

nevermind, had to make it an entity

[late mural]

im quite new to dots, so this is probably not a clever question, but can i convert unity terrain into dots physics collider thing, and if so, can i have it so non dots stuff still collides with it, or should i instead have 2 terrains, one for the dots and one for non-dots?

[late mural]

also is there a list anywhere of all the packages needed for dots to work?

[safe lintel]

terrain isnt really officially supported yet

one cludgy workflow might be to export terrain as a mesh and use that for your collider

for needed to work, generally if you install a package it will auto install its dependencies, ie physics will pull in everything it needs, same with hybrid renderer so with those two thats more or less covering all basic dots stuff(entities, collections, burst, math), then theres also netcode

maybe platforms as well to build stuff

[late mural]

ok thank you so much, ill try out the converting of the terrain to a collider to dots, and see how it goes, thanks!

[safe lintel]

the samples repo should have some useful cases to look at as a beginner, theres physics samples inside it

[late mural]

yup i saw them, they are super useful, thanks lol

[late mural]

what order do i have to install them? as it seems that installing them in any random order is not a good idea so far

[safe lintel]

shouldnt matter

[late mural]

odd, im getting an error every time i try to install any of them, about the dependencies

perhaps it is urp, does dots support that?

[safe lintel]

it does, you may have to restart the editor

[late mural]

i have tried restarting it, multiple times, doesnt seem to help, like it doesnt even install the packages, it just says it couldnt

[safe lintel]

has to be 2020 lts or 2021 lts

[late mural]

yup im running one of the many 2021 lts versions,

here is the error message, incase it helps

[safe lintel]

odd, ive not gotten that error before

[late mural]

welp that is annoying then, any ideas what could be causing it?

i dont think it is space, cause i have almost a tb of space left, it wont be admin, cause i launch unity / unity hub as admin

[safe lintel]

dont really know what that error means besides the obvious, but going through these kinds of hiccups are kinda a rite of passage with the dots onboarding experience 😅

[late mural]

welp lol, ill go do research, and try it on my laptop to see if it is device specific, but thanks for all the help!

[safe lintel]

good luck! maybe someone else will chime in later here

[late mural]

yup, after a bit of messing around, i found the one package that has no dependencies that break, the dot editor, but it breaking in other ways it appears, how fascinating

[safe lintel]

oh dots editor shouldve been rolled into entities package now so remove it

[late mural]

oh ok i have, but ye, still weird as i cant find anything anywhere about the other errors, and it seems no order of installation helps lol

[safe lintel]

are you upgrading an existing project or is this a brand new project and installing dots?

[late mural]

adding dots to an existing project

[late mural]

after much research, it seems this issue has never been seen before, atleast it hides in the shadows it has been seen before, no known solutions can be found with googling, trial and error isnt helping much either, very odd, i suppose it is a preview package, makes sense that it is unstable, but im determined, eventually there must be a way to fix it!

[rustic rain]

I warned you. Subscenes load async and world might start running before any subscene is koaded

[late mural]

for now ill have to go without dots, which is annoying, but oh well, if anyone does ever know of a solution i will gladly take it though

[rustic rain]

oh god ,living without 2D physics is pain

I literally consider using Hybrid 2D physics xD

[late mural]

atleast you have something working lol, but i wish you luck anyways for whatever your doing!

[rustic rain]

it becomes so much easier when you finally get that ECS thinking click

[late mural]

ye, i cant wait till i am able to start learning, but so far ive had no luck in installing it

[rustic rain]

installing?

just add Hybrid Renderer

it will install itself

kek

[late mural]

does not work

[rustic rain]

what version are you on?

unity

[late mural]

one of the many lts versions of 2021

[rustic rain]

only 1 will work

[late mural]

oh only that version will work?

[rustic rain]

yeah

[late mural]

welp i feel like a fool now

[rustic rain]

and that on 2020

[late mural]

sorry lol, i thought any 2021 lts version would work

oh i cant install that editor version

apparrenty it requires over 550 gb of space

[rustic rain]

wha

lol

no it's not

[late mural]

i know

unity does this to me every install

it checks for space in my f drive, but installed in my d drive

i do not have an f drive though

[late mural]

yup

as such i now have to go find a drive to plug in and be my f drive, and it needs to have enough space, so that i can install unity onto my d drive

installing unity is a pain

[rustic rain]

why not just reinstall Hub to drive you want?

[late mural]

hub is installed on the drive i want

it is installed on my d drive

but hub likes the f drive, just like visual studio, and visual studio code, and omni sharp, and so many other programs

despite me not having one

no clue why my computer does this, cant seem to fix it either, as such i just have to go find something to be an f drive whenever this occurs

welp guess ive either gotta go find something to be my f drive, or just deal with not having dots

sometimes i just wish there was an option to install without checking for space

because there is no space, cause the drive does not exist

[covert lagoon]

Not 34f1?

That's what I was using

[rustic rain]

well, I heard someone was using it either without a problem

pretty sure since you are using it

you know better

xD

[covert lagoon]

Also all the DOTS packages say 2020.3.0f1 in their package.json

[rotund token]

it needs to be 3.30f1+

[rustic rain]

Any idea whether Companion Game object Update Transform system has any write group filters?

I might want to disable it at some point

[rotund token]

your as capable as anyone else in here to look at the source yourself 😄

[rustic rain]

Can't find it

I only found disabling/enabling companion link

[rotund token]

CompanionGameObjectUpdateTransformSystem

but no it doesn't

because it doesn't write to an actual component

and write groups require a component to write to

[rustic rain]

welp

Transform is also component

just managed

kek

[rotund token]

it doesn't have Transform

in it's query

i think you are probably the first person to ever think

you know, even though they're meant to be the same thing, i don't want my gameobject companion to be the same as the entity that represents it

[rustic rain]

welp, yeah xD

Literally everything is done through hybrid atm

animations, rendering and even physics

since no 2D

so at some point I just want to disable companion link update on entity

so it drops dead through classic physics

[rotund token]

has anyone got unity + il2cpp building without errors in 0.51 + 2021.3.4f1?

i can build mono fine no issue, soon as i try build il2cpp and run the game

flooded with
ExecutionEngineException: Attempting to call method 'Unity.Entities.FastEquality+CompareImpl`1[[Unity.Physics.PhysicsWorldIndex, Unity.Physics, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]]::CompareFunc' for which no ahead of time (AOT) code was generated. at Unity.Entities.FastEquality.Equals (System.Void* lhsPtr, System.Void* rhsPtr, Unity.Entities.FastEquality+TypeInfo typeInfo) [0x00000] in

[rustic rain]

yep, I found how it does it. Sadge

hmm, so write group will only work if I try to write to that component of group?

How that would work with managed component?

I want to try and mod this system's query

            m_ExistingQuery = GetEntityQuery(
                new EntityQueryDesc
                {
                    All = new[]
                    {
                        ComponentType.ReadOnly<CompanionLink>(),
                        ComponentType.ReadOnly<CompanionGameObjectUpdateTransformSystemState>(),
                        ComponentType.ReadOnly<LocalToWorld>(),
                    }
                }
            );

Here's the query that system uses to write to. All read only 😐

hmm, if I simply put different query with readwrite on CompanionLink

and Write group filter

is that going to work?

[hot basin]

I wonder why there is no official post about 0.51 yet

[rotund token]

no idea

never tried on a managed component

in theory yes

(if you add write group to the query as well)

[rustic rain]

yeah, will try that through reflection

btw, is there any attribute that I can use to some static method to be executed during WOrld init phases?

like after OnCreate of systems

[rotund token]

no that sounds gross

i guess if you use the default bootstrap

you could just do the next stage of RuntimeInitializeOnLoadMethod

[rustic rain]

nnah

I'll just use other system for that injection I guess

[hot basin]

@rotund token had you maybe the problem with autogenerated IBufferElements with Entity field?

[rotund token]

what?

[viral sonnet]

ExecutionEngineException: Attempting to call method 'Unity.Entities.FastEquality+CompareImpl`1[[Unity.Physics.PhysicsWorldIndex, Unity.Physics, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]]::CompareFunc' for which no ahead of time (AOT) code was generated. at Unity.Entities.FastEquality.Equals (System.Void* lhsPtr, System.Void* rhsPtr, Unity.Entities.FastEquality+TypeInfo typeInfo) [0x00000] in <00000000000000000000000000000000>:0 at Unity.Entities.FastEquality.Equals[T] (T& lhs, T& rhs, Unity.Entities.FastEquality+TypeInfo typeInfo) [0x00000] in <00000000000000000000000000000000>:0 at Unity.Entities.TypeManager.Equals[T] (T& left, T& right) [0x00000] in <00000000000000000000000000000000>:0 at Unity.Entities.ManagedComponentStore.FindSharedComponentIndex[T] (System.Int32 typeIndex, T newData) [0x00000] in <00000000000000000000000000000000>:0 yep, I think I have the same problem as @rotund token

[rotund token]

it happens in an empty project

with just dots packages

and an empty scene

tested other properties packages with no luck

already forwarded it over to unity

at least it builds with mono...

also having a lot of code gen issues that need an editor restart to fix - not an ideal work flow

[viral sonnet]

waiting for half a year and getting errors. meh 😒

[hot basin]

[GenerateAuthoringComponent]
    public struct SpawnerEntityReference : IBufferElementData
    {
        public Entity entity;
    }

@rotund token this

[viral sonnet]

i hope they at least sent you a shirt by now for all the things you found tertle

[rotund token]

not sure I have any of these

but wouldn't surprise me

there's a lot of odd errors btw

error SGICE004: Seeing this error indicates a bug in the dots compiler.
or
info SGICE006: System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Program Files\Unity\Hub\Editor\2021.3.4f1\Editor\Data\DotNetSdkRoslyn\Temp\GeneratedCode\X

[hot basin]

line 11 is creating buffer for entity in generated script

so null ref in something that basic seems very odd

[rotund token]

https://forum.unity.com/threads/0-51-invalidoperationexception-cannot-find-unity-netcode-metadata-reference-for-assembly.1296129/
also this issue with netcode

though that's not breaking, just annoying

so yeah not really recommending anyone upgrade atm

[hot basin]

it's too late

I'm too hyped to back down 😄

seemd strange but managed comonent nedded to have all public fields

due to new code generators

[rotund token]

that'll die

when you have to restart the editor every time you make a code change

[rustic rain]

no it won't xD

[hot basin]

nice I figured it out

they make an array of entities is autogenerated code

which is never initialized

and then they are trying to use it

public class TileUnitAuthoring : UnityEngine.MonoBehaviour, Unity.Entities.IConvertGameObjectToEntity
    {
        public Unity.Entities.Entity[] Values;
        public void Convert(Unity.Entities.Entity __entity, Unity.Entities.EntityManager __dstManager, GameObjectConversionSystem _)
        {
            Unity.Entities.DynamicBuffer<_YourHighness.Map.TileUnit> dynamicBuffer = __dstManager.AddBuffer<_YourHighness.Map.TileUnit>(__entity);
            dynamicBuffer.ResizeUninitialized(Values.Length);
            for (int i = 0; i < dynamicBuffer.Length; i++)
            {
                dynamicBuffer[i] = new _YourHighness.Map.TileUnit{unit = Values[i]};
            }
        }
    }

seems it will work in case when type will be serialized as inspector will initialize it

I can confirm that was the case

haha

I have another strange error

UnityEngine.Debug:LogError (object)```

protected override void OnUpdate()
        {
            var ecb = entityCommandBufferSystem.CreateCommandBuffer();

            var attacks = attackQuery.ToComponentDataArray<Attack>(Allocator.TempJob);
            var healths = GetComponentDataFromEntity<Health>(true);
   
            
            var map = new NativeParallelHashMap<Entity, int>(attacks.Length, Allocator.TempJob);
            var jobHandle = new SortAttacks
            {
                attacks = attacks,
                map = map.AsParallelWriter()
            }.Schedule(attacks.Length, 5, Dependency);

            jobHandle = new ApplyAttacks
            {
                map = map,
                healths = healths,
                ecb = ecb,
            }.Schedule(jobHandle);

            ecb.DestroyEntitiesForEntityQuery(attackQuery);
            jobHandle = map.Dispose(jobHandle);
            
            Dependency = jobHandle;

            entityCommandBufferSystem.AddJobHandleForProducer(Dependency);
        }

[silk current]

Hey, does anyone have any idea why just adding ref Scale scale into my Entities.Foreach break basically everything?

[hot basin]

and the job itself has [ReadOnly] public ComponentDataFromEntity<Health> healths;

[silk current]

It's like no object is selected, suddenly

[hot basin]

was Dependency overriding pattern changed in 0.50?

[hot basin]

check entities (via DOTS hierarchy window) if they have Scale on them

they probably don't

[silk current]

hmm, they do not indeed

how would I add it?

I kinda thought it would add automatically like translation and rotation

[hot basin]

I think there is no easy way

[silk current]

I think I figured it out, I need to add it with EntityManager

or am I wrong?

[hot basin]

only when scale isn't 1,1,1 it will be automatically added

[silk current]

oh no
it breaks burst

[hot basin]

It seems so, you can also make authoring script to add it while conversion

[silk current]

With a struct Scale and a float named Value? Would that work??

and just add it to the gameobject prefab?

[hot basin]

make sure you use Unity.Transforms one and not one from i.e. UiElements

it should be burstable

[rustic rain]

there are 2 versions of scale

Scale and NonUniformScale

[hot basin]

oh yeah, I forgot about that

[rustic rain]

idk why they did it that way

so annoying

so painful to work with

ngl

[hot basin]

I moved out from using Unity.Transforms

[rustic rain]

how so?

I wish I could do that too xD

[hot basin]

I use only LocalToWorld

[rustic rain]

Since I have 2D

[silk current]

unfortunatley, NonUniformScale breaks things as well

[hot basin]

you still need to add it to entity

[silk current]

I guess I could try making the object have something like 1.0001 scale... I'm gonna reset it anyway

lmao that works

[hot basin]

yep

you should just make a authoring script for Scale/NonUniformScale

[viral sonnet]

yes, it got more strict. also had a few issues when going from 0.17 to 0.50

[hot basin]

are there any resources on this?

[viral sonnet]

not really, the safety system just complains where it didn't before

so technically it was a mistake that wasn't catched

[hot basin]

do you know how to fix this?

[viral sonnet]

only some tips, check the line where it is thrown

sometimes the error in itself is pure garbage

and only take the first time such an error is thrown seriously, others are cascading errors from the first one

[hot basin]

it's at ecb.DestroyEntitiesForEntityQuery(attackQuery);

[viral sonnet]

what also helps is putting some jobHandle.Complete() in places you are suspicious about. if it fixes it, you know where the problem is

[hot basin]

moving it before the jobs helped

wtf

[pliant pike]

I'm trying to access a buffer after a job where I've populated it but I'm getting this error Attempted to access BufferFromEntity<PotentialMoveBuff> which has been invalidated by a structural change.

I have jobhandle.complete and Dependency().Complete straight after the job

[rustic rain]

buffers are invalidated by structural changes

after any structural change you need to get buffer again

[pliant pike]

I even create a new GetBufferFromEntity after the job, I'm not sure what is happening 😕

yeah I am getting the buffer again or so I think

I do this before the job var potentbuff = GetBufferFromEntity<PotentialMoveBuff>(); var realbuff = potentbuff[PotentMoveBuffEnt];

and then this after var newent = GetSingletonEntity<PotentialMoveBuff>(); var oldnewbuff = GetBufferFromEntity<PotentialMoveBuff>(); var newbuff = oldnewbuff[newent];

[solid estuary]

so is jobs production ready or should I bother learning how to multithread by myself?

[rustic rain]

jobs are

jobs + burst

[silk current]

hey, is there a way to change surface type of the material on an entity?

from a job

preferably without EntityManager

I really really need to get transparent objects to work somehow

wow. I needed to enable zwrite in inspector in debug mode, and changing it to normal mode breaks it again

I can't click on the material

thatis so silly wth

[rustic rain]

all right, I'm done with hybrid

looks like physics is the only way

🕯️

[misty wedge]

Do the source generators in 0.51 force you to use only public instance types?

[rustic rain]

Any idea about unity physics debug display?

I created entity with that component but I don't see any visualisation

[remote crater]

1 week of 40 hours of work and more 20+ of fret, I have addressables take over the resources folder's duty. I have a few other possible problems, but it looks promising. Thanks guys for the help. Standalones should be hard let alone this hard, but with solid, friendly help like yourselves at least they're doable.

[hot basin]

try to build one a week next time, companies setup whole CI/CD pipelines to prevent such situations

but build once a week should be plenty

[remote crater]

So I beat a couple issues, but I am left with: AssertionException: Ensure TypeManager.Initialize has been called before using the TypeManager.... I think Editor runs slower and my code works there because of a fortunate race condition. What is the proper way to Initialize TypeManager MORE INFO HERE: https://pastebin.com/hBvgGXBf

[remote crater]

Right, I'll do that. I never knew this could be an issue since I never encountered it in 40+ years of coding, but now I do, and I can mitigate. Thank you for wise methodology advice.

That feeling when the google search return only result is your question from 4 days ago:

Oh tertle said to try disabling entities journaling

I disabled it in the menu, I still get the errors.

[rustic rain]

are collisions still only done through ICollisionEventJob interface?

I need to make managed collision events loop

[remote crater]

There is one that checks triggers too

What you do is check the collisions in that job

then you check each entity based on some components

and then filter the collison based on what hit what

Everything is done through ICollisonEventsJob and ITriggerEventsJob I believe if those are the names

[rustic rain]

yeah, I know

I just wondered

whether it's still the only way

cause I never liked it

I really find inability to manually choose which collision events to query really troubling

[safe lintel]

yeah havent been any major changes to physics

[remote crater]

You do not want to be querying collision events

[safe lintel]

kinda sad, physics improvements were moving at a really good pace prior to that year long wait

[remote crater]

query is for information always there that you want to process

a collision is a one time deal

[rustic rain]

wdym?
How do I get collision events then?

in case I need custom logic on collision

[muted field]

is it possible to wrap a native collection into a read only version like this:

private NativeArray<float2> _v;
//public ReadOnlyNativeArray<float2> Vertices => _v;
...

[remote crater]

Once you receive the two entities that collide, you process their components

Are you able to detect when two entities collide with your Job?

An event is different than a query

[rustic rain]

well, that's what I was complaining about: I get 2 entities, but not context

and I have to figure out from what context are they

[remote crater]

When you have two entities, you have components attached

You can get the data to process them from their components.

Sec, let me help you

What does your Onupdate look like?

[rustic rain]

        protected override void UpdateWithBuffer(EntityCommandBuffer buffer)
        {
            Dependency = new GroundCollisionJob { buffer = buffer, playerEntity = _player }.Schedule(
                _stepWorldSystem.Simulation,
                Dependency);
        }

[remote crater]

This is mine: https://pastebin.com/BqZFLvMC

See that's the problem

You don't pass components in

You can't read components into your execute

unless you pass em, click my pastebin

Then I'll show you my execute

[rustic rain]

I don't really get it

[remote crater]

appologies for mass comments in my code, I use em like ship wrecks

[rustic rain]

is there some kind of secret codegen behind?

[remote crater]

https://pastebin.com/y7e28CW6

Notice I pass Entity Data and Translation

EntityData is a custom component I give useful information to my entities

[rustic rain]

yep, that's what I was talking about

[remote crater]

Translation is the position n stuff

[rustic rain]

you go through each entity and figure out which one is which

[remote crater]

Then In your execute, you can process em

Click the second pastebin, most recent

That shows how once you pass a component in, you can read it in the execute

Now that you have custom components you made in, you can process how entities handle the collision if its a bullet, rocket, person, wall, exploding barrel, etc

[rustic rain]

hmmm, can I adjust entity to stop creating collision events?

[remote crater]

Take away its collider

You can disable its physicsshape or body or something

[rustic rain]

it's singleton

I only need to disable raising events

cause I still need collision to be processed

[remote crater]

Oh that's a sub chceck box

[rustic rain]

removing collider is not an option

yeah, and I need to change it in code

[remote crater]

under material->Collisionresponse in the component

You should be able to find that in the Physics Shape component

[rustic rain]

yeah, but that's authoring

and I need runtime

[remote crater]

Look at the GUI of it on its attached

You can change that in run time

[rustic rain]

how?

[remote crater]

First get the Physics Shape Component

[rustic rain]

Inside code

I already have PhysicsCollider

[remote crater]

Physics Shape is where the ability to turn on and off the events is

[rustic rain]

But I only have Physics Collider

[remote crater]

Every Entity that collides has both

[rustic rain]

Physics Shape is authoring component

[safe lintel]

@rustic rain you can do it like this https://forum.unity.com/threads/toggling-collision-events-via-script.851761/ under (b)

[rustic rain]

wait what

how do I get material/

?

[safe lintel]

its a property of the collider blob

[rustic rain]

hmm

[safe lintel]

the code is in the spoiler tag

[rustic rain]

I don't see it

oooh

spoiler tag

lul

oh, casting into other type I see

[coarse turtle]

I guess you can wrap it like so:

readonly NativeArray<float2> classNativeArray;

SomeConstructor() {
  classNativeArray = new NativeArray<float2>(...); // Init w/ persistent allocation
}

[muted field]

ah true

[viral sonnet]

I found manual sphere/capsule/whatever casts much easier. also they perform a lot better. maybe you can use them instead of fixed triggers

[rustic rain]

hmm

I am also considering it atm

[viral sonnet]

i find physic shapes only good to use for basic collisions. i. e. character controllers. for everything else, the colliders being immutable makes things difficult

[rustic rain]

how do you check whether smth collides with smth?

in my case I have floor

wwaaaait a second

I don't think it'll work

damn it

I need a way to determine whether my entity hits the floor

and when it does, usually you can't catch that with simple cast

or overlap

[viral sonnet]

hm, for a floor the default ICollisonEventsJob works best

[rustic rain]

since almost all the time it'll hit only between ticks

yeah

[viral sonnet]

some capsule cast with velocity would work

[safe lintel]

you need an iterative solver i guess

[viral sonnet]

should catch everything even between frames when the cast length is the velocity distance for the frame

[gleaming surge]

What physics features are you thinking about

[muted field]

does unity plan to expose native arrays etc to the inspector in future?

kind've annoying not being able to add test data in them

[rotund token]

what do you mean to the inspector?

i can't think of a scenario, except a custom debug windows, where this would ever make sense

[muted field]

i want to fill a native array (persistent one) with vertex float2 data

so i can then run it to test collision stuff

right now i have to use a list then populate a native array from the list which is just verbose and annoying

[rotund token]

but you cant have an allocated native array just sitting on a settings file?

[muted field]

why not when you can have a list serialised

if its persistent whats so different about it

[safe lintel]

@gleaming surge they teased some things like lower fidelity physics for particle sim, also better api's for collision, some better joint authoring, im not really convinced by the split physics shape/body either. oh and I know terrain colliders are also something others need. anyway the speed of visible development just kinda dried up

[void girder]

Entities 0.51 is giving compile error with JobsUtility, such as "Library/PackageCache/com.unity.entities@0.51.0-preview.32/Unity.Entities/DefaultWorld.cs(26,25): error CS0117: 'JobsUtility' does not contain a definition for 'ClearSystemIds'"

Any suggestions?

[hot basin]

yeah, https://docs.unity3d.com/Packages/com.unity.entities@0.51/manual/upgrade-guide.html

seems like you missed something

[void girder]

Currently upgrading my Unity editor version

[hot basin]

and remember that 2021.3LTS is current latest version of unity

[void girder]

Yeah upgrading to 2021.3.4 from 2021.3.0 worked

[frosty siren]

Who can enlighten me about how to initialize blob asset when it is a BlobArray itself?

[remote crater]

Yo tertle, adding the precompiler command: DISABLE_ENTITIES_JOURNALING Got me past that Standalone Error. I'm now stuck on some weird thing where the addressables aren't packing themselves properly: https://forum.unity.com/threads/please-please-please-help-me-get-a-standalone-scriptable-build-pipeline-isnt-documented.1294917/

We closing in on a nice revenue stream and a dream realized man.

[misty wedge]

Does Unity have any unbuilt inbuilt ways to test the performance of DOTS systems?

[rustic rain]

wdym unbuilt?

@misty wedge

[misty wedge]

Oops, should have been inbuilt

[rustic rain]

you mean built in?

[misty wedge]

https://dictionary.cambridge.org/dictionary/english/inbuilt

[rustic rain]

eeeeh, still not sure what it would mean in that context, but system debugger literally has profiler built in

is that smth you're looking for?

[misty wedge]

I meant more of a benchmarking tool

Similar to Benchmark.Net or something

e.g. set up (in this case build the world state) -> benchmark / test -> tear down workflow

I guess the unity test runner can probably do it, but I was wondering if there was something specifically for dots

[rustic rain]

Anyone had any perfomance problems with Physics?
For some reason for me with just 2 physics shapes one of which is static
I get 5 ms in step physics world system

and overall it jumps to 10ms

[rotund token]

Do you have integrity checks off?

[rotund token]

Have you tried performance tests package? Not dots specific but just a general purpose performance profiler

[viral sonnet]

tertle, did you solve the physics bug in builds?

[safe lintel]

@rustic rain are you profiling the timeline or hierarchy?

[rustic rain]

I did turn them off, but that didn't change much

[rustic rain]

I am not profiling anything, I am just watching my fps go from 150 to 30

and physics systems go to 50ms

sometimes

[safe lintel]

should use the profiler because sometimes systems can be waiting on other jobs(spawned from other systems) to complete and you get an inaccurate view of ms timings

[rotund token]

What bugs?

[rotund token]

That doesn't mean it's physics

That just means physics causes a sync point and it's waiting on that

[rustic rain]

well, I don't have any systems that are related to physics atm

[misty wedge]

Sounds good, thanks

[rotund token]

Do your systems use translation or rotation?

[rustic rain]

literally just 2 entities with physics components and fully vanilla

[rotund token]

Because then they are related

[rustic rain]

yeah

hm

[rotund token]

You just need to look at profiler

[rustic rain]

I'm not sure what to look at it

seems like it's the first systems all together to run

[rotund token]

Looks like you have full stack trace on to me

[rustic rain]

huh

indeed it helped

but still, 2ms for physics

uugh

[safe lintel]

also click the 3 dots and enable flow events

it shows what system created what job

[rustic rain]

hmm, where are those 3 dots?

[rustic rain]

huh

interesting, thanks

sometimes in peaks it just lags

[viral sonnet]

the AOT error that is thrown in builds

[misty wedge]

I had this when I was still using the physics system

It was orders of magnitude faster in a build

[rustic rain]

I hope it will, this is supposedly mobile project xD

[rotund token]

Oh that's a general shared component data issue

Just using the workaround on forums for now

[rotund token]

got jogs debugger on?

[rustic rain]

so, that's also a reason? xD

[rotund token]

yes, jobs debugger adds a lot of main thread slowdown

you really shouldn't profile with any safety on

there's no point

my step physics with 1000 falling cubes is 0.70ms in editor

with jobs debugger on 1.75ms

[rustic rain]

meanwhile my 2 entities 1.5ms with jobs debugger

xD

[pliant pike]

yeah I have a job which is like 2000ms and goes down to 60 odd I think without safety checks

[safe lintel]

I think to an extent theres overhead with physics kinda like the hybrid renderer, though I suppose it depends what your hardware is to determine what that is exactly

[rustic rain]

I just wish they roll out 2d physics as soon as possible

[safe lintel]

I wish for many things with dots 🥲

[viral sonnet]

there is one?

[rotund token]

https://forum.unity.com/threads/executionengineexception-attempting-to-call-method-unity-entities-fastequality-compareimpl-1.1296462/#post-8211645

not ideal due to slower runtime but works for now

[viral sonnet]

oh, I didn't try that. never thought this would work tbh 😄

[pliant pike]

stupid question but I don't suppose anyone knows why I get this error Attempted to access BufferTypeHandle<PotentialMoveBuff> which has been invalidated by a structural change. when trying to access the length value of a buffer

I'm not structurally changing it anywhere near this code I 'm just getting the length 😕

[rotund token]

basically it means you use entity manager

after accessing buffer

[pliant pike]

huh, so I can't do that

I see entitymanager is a structural change

[rotund token]

all buffers are invalidated by any structural change

just in case the buffer might have moved chunks

its just a safety measure

it would be costly for unity to validate which buffers have/haven't moved

so it's just faster/safer to invalidate everything

[pliant pike]

so how do I even read teh buffer then

[rotund token]

you read it

you just don't use entity manager until you're done reading it

https://docs.unity3d.com/Packages/com.unity.entities@0.51/manual/dynamic_buffers.html#structural-changes-invalidate-a-dynamicbuffer

it's in the manual 😄

[pliant pike]

well that's a new addition I'm sure, they keep updating this stuff dammit

[rotund token]

your solutions are really either
a) copy the buffer to a native array
b) use a command buffer and playback after the loop

[rotund token]

if you mean new you mean entities 0.6 in feb 2020 😄

https://docs.unity3d.com/Packages/com.unity.entities@0.6/manual/dynamic_buffers.html#buffer-reference-invalidation

[pliant pike]

yeah I maybe slightly behind in reading it

[rotund token]

real programmers don't read manuals am i right?!

source code is where it's at

[pliant pike]

actually I normally do check that page quite often when I use dynamicbuffers just don't think I scrolled down than far 😆

[rotund token]

anyway yeah that's your problem

a pretty classic one

[pliant pike]

yeah the small print don't matter all I need is the setup

well thanks for clearing that up

[sharp stump]

So ECS has no animation system. I am told that to have entities that animate I have to convert them from GameObjects. Is this so? Can I get entities that I can animate by converting gameobjects?

[rotund token]

that seems like odd advice

if ecs had an animation system you would convert entities from gameobjects (which is what you should be doing anyway)

generally you animate using a hybrid approach of having gameobjects with the animator

which is referenced by an entity

otherwise you need to go into shader animation territory

[misty wedge]

Just don't have any animations taps forehead

That's my trick

[misty wedge]

I always think of this when thinking of shader animations

[sharp stump]

Why would you have to use game objects if ECS had everything you needed? I don't think game objects are useful in the least and I would much rather not use any at all.

[rustic rain]

game objects are part of conversion

which is integral to ecs

[sharp stump]

Well, yes, its necessary in its current state, but that can't be the case forever.

[rustic rain]

it is meant to be the way of standard workflow

so unless Unity fully gets rid of game object, I don't see how it can become obsolete for ECS

[sharp stump]

That can't be the case. Why would you just throw away all of your GameObject based features just because you have an ECS alternative?

Also, why would I have a workflow that uses GameObjects to create entities if I didn't have to? Seems like doing it twice

[rotund token]

because thats the intended workflow of entities

author your entities via gameobjects in subscenes

i.e.
gameobjects - authoring state
entities - runtime state

1.0 significantly expands on this further

[rustic rain]

hmm

it seems like I can't modify Collider without knowing it's type beforehand?

[rotund token]

not sure what you mean by that

you mean a unity physics collider?

you can get the type from it

[rustic rain]

I am trying to modify current physics into 2D

rn what I want is to go through all converted GOs

and modify their colliders to be at Z == 0

offset

depending on converted LTW

[rotund token]

yeah what's stopping you?

(though weird)

[rustic rain]

Can't figure out how to modify collider

since I get generic type of

Collider

which wouldn't allow such modifications

[rotund token]

Collider has a field called Type

[rustic rain]

what about casting?

[rotund token]

you get the ptr

and cast it

[rustic rain]

var boxCollider = (BoxCollider*)e.ColliderPtr;

hmm

all right, seems to work

mmm

seems like changing Center is not allowed normally

[rotund token]

well colliders are blob assets

[rustic rain]

ah, it's private field

[rotund token]

blob assets are meant to be immutable

[rustic rain]

but I assume if I modify it through reflection

it'll change?

[rotund token]

i certainly would not use reflection

[rustic rain]

how else would I change private field?

this is one time conversion process

[rotund token]

it's meant to be set via boxgeometry

but i wouldn't do it this way at all

i'd just write my own physics conversion for physics2d components

[rustic rain]

hm

standard physics shape authoring has so many nice features tho xD

[rotund token]

including setting center

so why do you need to change it then?

[rustic rain]

I don't want to modify it every time

I change Z

on every game object

I'm trying to simplify my authoring process

[late mural]

wondering, can you instantiate prefabs with dots like regular prefabs, and if so do they require more processing power to instantiate then non dots prefabs, or less?

[rustic rain]

EntityManager.Instantiate

[late mural]

oh ok nice, thank you so much!

[late mural]

due to me being completely new to everything dots, do you have to create an entity manager manually, or is it auto created when it detects that the scene has dots in it? (sorry if this is a stupid question, the docs for the dots api are quite vague or im being quite dumb)

[rustic rain]

it's property of SystemBase

or any other system classes you might use

[late mural]

aha, i have no clue what either of those things are

let me check the docs brb

[rustic rain]

just go to manual kek

[late mural]

lol

[rustic rain]

https://docs.unity3d.com/Packages/com.unity.entities@0.51/manual/ecs_core.html

there

[late mural]

oh thanks lol

[late mural]

so from reading this it appears i do have to create a system base, and it doesnt make itself, and that system bases cant be made in monobehaviours, am i understanding this right?

[rustic rain]

just keep reading xD
It's totally different world from game objects

at a point it'll get to examples

and all you read will finally start to make sense

[late mural]

yup lol, im excited to learn this, im gonna feel dumb once i understand this

ok ive kept reading, and it seems that each different archetype (list of all entities that are exactly the same component wise) each have their own entity manager, i think, this is so fascinating lol!

and each system is part of a world, which is like the entity version of the scene, except you can have multiple worlds in one scene, and multiple scenes in one world

[rotund token]

not really

there is 1 entity manager per world

[rustic rain]

wha

since when pasting code is illegal?

[late mural]

oh ok cool!

also is it normal and good for dots to really hate one random script that doesnt even use dots?

huh unity discord is not enjoying you pasting that code, unlucky

[rotund token]

im a fast reader issue but i can't read all that code in 0.1s

[late mural]

same lol

[rustic rain]

What am I doing wrong?

trying to make a constraint joint

so entity can only move in X,Y and rotate around Z

results in NaN

[late mural]

is this normal, the file doesnt even use dots?

[rustic rain]

try to restart editor

[late mural]

ok i will thanks

[rotund token]

new issue with 0.51 unfortunately

you can just delete the directory as well

to avoid editor restart

[late mural]

delete what directory? the assembly c sharp thing?

[rotund token]

yeah just everything in temp directory

[late mural]

ok, and it wont break anything?

[rotund token]

its a temp directory

[late mural]

ok good

[rotund token]

just reimport something aftewards

for some reason

its creating files instead of directories in there sometimes

[late mural]

ok got it

[late mural]

ok im a bit confused, im trying to interact with an entity, which means i cannot use a mono behavior, but if i dont use a monobehavior then i cannot atatch the script to a game object, therefore i cannot make it run?

[rustic rain]

with ECS, updates happen from inside systems

create a class that inherits from SystemBase

and make your logic in there

no game objects

[late mural]

ok, so i dont need to attach my script to a game object then if i do that, i can just let it rot in some folder somewhere?

[late mural]

oh also more importantly, how do i do that?

[rustic rain]

same way you create monobehaviour

I suggest to keep looking through manual

it has examples

[late mural]

this makes sense, but the manual ended after one page, with no examples, i tried searching around for the rest of the pages of the manual, but it appears that they have scattered in the wind, or atleast they are evading my grasp

[rustic rain]

ahem

you just keep going through each page kek

[late mural]

oh those things, i didnt realise they were pages...

[late mural]

but judging by this im gonna make a wild assumption from what ive read so far, and say ComponentSystem?

something like ```csharp
public class whatever_name : ComponentSystem
{
stuff here
}

[rustic rain]

SystemBase

[late mural]

oh ok!

fascinating, my no error code has suddenly gained quite a few errors, but they look fun to debug, thank you so much!

this is gonna be yet another stupid question, how do you run the for each of the entities thing, as it seems most info about it is nolonger working, i would assume outdated judging by how most info is from 2020, and the documents in the manual thing are equally unhelpful, being quite vague in description. Infact the best information about it i can find would be in the error message which tells me to either use schedule, scheduleparallel, or run, but if i dare do any of these it gets even angrier, how odd

[rustic rain]

manual is up-to-date

[late mural]

yes, but the manual is super vague

sorry i phrased things weirdly

[rustic rain]

https://docs.unity3d.com/Packages/com.unity.entities@0.51/manual/ecs_entities_foreach.html

[late mural]

ive already been there, nothing there helps me, the more i follow the guide, the less things work

it seems that you need to have schedule, parrallelschedue, or run, none of which i am allowed to use for unknown reasons

im guessing im missing something extremely obvious?

[rustic rain]

To execute a job lambda function, you either schedule the job using Schedule() and ScheduleParallel(), or execute it immediately (on the main thread) with Run()

this is from manual 🙂

[late mural]

yes, i read that, unfortunately none of them work

if i dare use one, i get told off

[rustic rain]

paste code

that doesn't work for you

[late mural]

curse it ill screenshot it

sure one bit is cut off, but that bit never raises any errors

also ignore my snake_case i know it isnt proper c sharp style, but i find it hard to read CamelCase, dont know why i do, but i do

[rustic rain]

I can see an error already, kek. Hold on, a bit busy

[late mural]

it's ok, take as much time to do whatever, im in no hurry

[rustic rain]

well, you need to add WithStructuralChanges()
But that exact thing is told to you by error you get if you run

Errors in ECS are really helpful

so, pay attention to them

there are so many safety checks inside

it will shout on you on literally every possible error

[late mural]

oh ok, lesson learnt, and when do i do teh with structural changes thing, and are there any things i need to pass into it?

[rustic rain]

if you do structural changes, you need this attrubte

and also need to Run

as structural changes can only happen on main thread

[late mural]

im really feeling like an idiot at the moment, what on earth are structural changes, and which attribute, on which one of the things?

[rustic rain]

in this case you are allowed to do managed code inside your lambda

WithStructuralChanges() is attrubute I talk about (could be wrong terminology)

structural changes are described in manual 🙂

https://docs.unity3d.com/Packages/com.unity.entities@0.51/manual/ecs_components.html

[late mural]

oh, i clearly have not gotten to that point in the manual yet, im only up to page 3 so far, but thank you!

[late mural]

ok that makes sense, i still dont know which one needs it, but atleast it is a good starting point for research!

ok from reading it, it seams somthing somewhere of somekind needs it, i still cant work out exactly what, but im getting closer

also the more i read, the less and less this seems like an attribute, the more it seems like it is a method of some kind

how you attach a method, to a thing i have no clue (i dont actually know the technical name for the thingys that contain and are and exist and stuff, im sorry im very stupid lol)

but this is a fun mystery!

[late mural]

also according that that, there are no structural changes in my code, which raises the question, why do i need the structural change thing anyway, it definitely seems required, but as to why, the manual seems to disagree with the reality

[rustic rain]

creating entity

adding/removing components

also changing shared component

are structural

destroying entity also

[late mural]

oh, ye that would make sense, sorry i am an idiot, im up to page 5 now, and still no sign of anything to do with structural changes, so i hope i find the page soon

i did manage to find another page that described the for each entity thing, but that made no mention of structural stuff anywhere sadly, i hope i find wherever this knowledge is kept, it seems to be well hidden

[rustic rain]

you instantiate entity

it's creating

[late mural]

yes, that is what i agreed with?

aha i found something about structural changes! It is super vague, and i dont know how to use it, and it has no examples, but atleast it is confirming the existance of it!

they get this small paragraph, and are not mentioned anywhere else judging by my research, so imma trial and error this thing all over my code until i figure out what it does, and how to use it

[devout prairie]

One of the things i admittedly struggle with when moving away from Transforms and gameobjects etc some of the helper methods we take for granted for example transform.RotateAround() etc, things that involve quaternions and matrices that i have no idea the math behind

[rustic rain]

by default all ForEach lambdas are bursted and threaded

and you can't do structural changes with that

so you need to disable burst and enable main thread

[devout prairie]

Obviously we can pick up some little tricks like converting a position or rotation from global to local space etc etc, but when there are more complex transformations required the maths is a bit of a black box

[late mural]

oh ok that makes sense, how do i make it so that it can do all that?

[rustic rain]

or you can simply do it inside OnUpdate without ForEach loop

ForEach is only required if you need to access entities

in World

nothing stops you from doing your own bookkeeping

inside System

[late mural]

ok, how do i do any of that?

[devout prairie]

For example if you google 'unity rotate a point around another point' or try and find the code behind transform.RotateAround you just get a ton of references to transform.RotateAround..

[late mural]

cause as far as i was aware from reading the manual then the for each loop was the only way of finding entities...

[devout prairie]

Would be nice for Unity to start providing some learning materials around how to do this, in order to transport some of this logic into bursted jobs

[late mural]

that would make sense, except how do i book keep things that do not exist yet?

[rustic rain]

ECS API is tough xD

you should read conversion workflow part

in manual

[late mural]

yup lol, i just wanna istantiate 1 entity that exists, and i have to deal with trial and error due to there being no documentation on the structural changes thing

[rustic rain]

this is how you are supposed to create entities

[late mural]

i know, i read that part, about 5 times now, perhaps more, i understand how to do it, and i have done it, but when it comes to instantiating, it breaks the entire thing

you cant convert while instantiating, because there is nothing to convert about it

[rustic rain]

EntityManager.CreateEntity

to create entity without components

[late mural]

yup i know that, i dont see how that helps me, sorry lol, im a bit of an idiot

[rustic rain]

you can do it inside OnCreate of System

[late mural]

once again, i dont understand how this helps me with istantiating, im sorry...

[rustic rain]

just tell what you want to achieve in the first place

I suggest you to start learning how manual suggest - with rotating cubes xD

[late mural]

i shall probably try that, but what i am trying to achieve currently is creating one entity with a few components like colliders and rigidbodies, and then istantiate that one entity a bunch, i have already achieved the creating of the 1 entity, it is the instantiating part im stuck on

[rustic rain]

like colliders and rigid bodies xD

that's like highest level

of ECS

kek

[late mural]

eh, well atleast they are easy to make

im starting small

[rustic rain]

they are not easy to make

[late mural]

oh, then i somehow stumbled my way into doing it then, i dont know lol

[rustic rain]

anything related to physics is advanced

[late mural]

oh

well i now that somehow i do have the physics stuff, i no longer need to touch them, all i need to do, is create more of them

luckilly there are so many tutorials everywhere on how to do instantiaing with dots, but all are out of date sadly and no longer work

[rustic rain]

try moetsi dots manual

https://dots-tutorial.moetsi.com/

[late mural]

that is multiplayer and stuff, i dont want to touch advanced stuff yet, i just wanna duplicate stuff, im really an idiot im guessing

[rustic rain]

it's not

it's total newb tutorial

which helped me a lot

to get into ECS

[late mural]

oh is it, ok welp ill go through it, thank you so much, sorry you are having to put up with my stupidity

[rustic rain]

netcode stuff is like part 4 of it

which is after physics

[late mural]

so far i have managed to heavily distort the dots text in the entity hierarchy thing to the point of almost unreadability, i cannot appear to replicate this amusing bug, but ill still consider it a personal win!

and it seems when i add my first entity i drop from around 400 fps to 10 fps, so quite the slow down so far, but im certain i must be doing something wrong to get such a performance drop

[rustic rain]

can't help until you show what you do

[late mural]

i dont know what im doing, as such i cant show you what im doing, as such i cant be helped by you, but still all the stuff you have said has been very useful, and shall continue being of great use

haha i got it working!!!

this clump of ominous spheres might not be the exact result i wanted, but hey im just so happy that my instantiating script works!!!