#archived-dots | Official Unity Discord | Page 126

junior fjord Mar 31, 2020, 5:37 PM

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I have a few systems that only get 1 entity every few frames (basically event based/user input systems). Are there any good reasons to do them either as Run, Schedule or ScheduleParallel?

safe lintel Mar 31, 2020, 5:38 PM

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run probably faster especially if you can run it with burst

junior fjord Mar 31, 2020, 5:38 PM

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oh really?

safe lintel Mar 31, 2020, 5:38 PM

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some very small overhead in scheduling it for other threads

junior fjord Mar 31, 2020, 5:38 PM

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because the overhead from the job system is larger than the work?

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what the systems do is normally get a "command" entity, set 1 or 2 global variables with 1 or 2 if statements

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that kind of thing

safe lintel Mar 31, 2020, 5:39 PM

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i noticed in my uses some jobs for a single entity were like 0.03-5ms with it being threaded, and then 0.01-2ms when just run

junior fjord Mar 31, 2020, 5:39 PM

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ah and also they add a component to the event of the form ConsumedBySystemX (s.t. I won't get the same entity again)

zenith wyvern Mar 31, 2020, 5:40 PM

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Yes if you're just settings variables then you should definitely just use Run

junior fjord Mar 31, 2020, 5:40 PM

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dunno if that is a good idea

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ok I'll go with run then

zenith wyvern Mar 31, 2020, 5:41 PM

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You can use a command buffer to avoid making structural changes during processing

junior fjord Mar 31, 2020, 5:41 PM

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at which point would you guys change from run to Schedule?

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yeah I am using an ecb for that

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for the component adding

zenith wyvern Mar 31, 2020, 5:42 PM

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Anything more complicated than just setting variables I will usually run as a scheduled job

junior fjord Mar 31, 2020, 5:44 PM

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So my event system is basically:

An Event always has a component

struct Event {
   float aliveSince;
   float destroyAt;
}

And a system that increases aliveSince and destroys the entity when aliveSince > destroyAt
Also the entity ofc has some component that has information (e.g. tileHeightChange) and all systems that need it can bind to it.
Every system that works on the event adds an ConsumedBySystemX in an ecb (for every system different X), and queries only for events that dont have ConsumedBySystemX.
So every system that wants the event, will see it once and the timing system makes the entity dissapear quickly (DestroyAfter is very short, it basically just needs to be longer than a frame)

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is there anything I could easily do better?

zenith wyvern Mar 31, 2020, 5:47 PM

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I'm not sure to be honest, I'm kind of hitting this problem myself right now where I'm trying to figure out the best way to handle system dependencies for tags that might need to exist for more than a single frame.

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It sounds like what you're doing is a solution for it, but having the tag just hang around for "some amount of time" seems weird

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But if it works it works

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There's also the performance cost to consider of having your consuming systems changing chunks every time they consume an event

junior fjord Mar 31, 2020, 5:49 PM

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@zenith wyvern not the tag hangs around for a random time, but the event entity itself

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but yeah it would be nicer to just have it be consumed once by everyone and deleted

zenith wyvern Mar 31, 2020, 5:50 PM

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Well yeah in my case I guess I'm basically using tag components as the events

opaque ledge Mar 31, 2020, 5:50 PM

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i dont think an event should hang around more than 1 frame tho 🤔

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but i guess it depends on what you are trying to do

junior fjord Mar 31, 2020, 5:50 PM

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yes it would be nicer to be deleted after one frame, but I had no simple nice idea how to do it

zenith wyvern Mar 31, 2020, 5:51 PM

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@opaque ledge The problem is the event might need to be consumed by more than one system, and it might cause another system to react which would also rely on the event. The obvious solution is to just create more events that you chain off one another

junior fjord Mar 31, 2020, 5:51 PM

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@zenith wyvern can you tell me an example on what you mean by event tag? Do you have one big event entity that you just add and remove tags from?

zenith wyvern Mar 31, 2020, 5:51 PM

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But then it becomes awful to maintain

fallow mason Mar 31, 2020, 5:51 PM

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a system that deletes event components that runs at the very end of the frame?

opaque ledge Mar 31, 2020, 5:51 PM

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have 1 system that creates it, have 1 system that destroys it, and your event entity at end or begin frame commandbuffer

fallow mason Mar 31, 2020, 5:52 PM

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or at the very beginning, cleanup up last frame's events?

junior fjord Mar 31, 2020, 5:52 PM

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@zenith wyvern you mean every system deletes the event and creates a new one except one last chosen system? that sound like a lot of boilerplate and also which system is the last

opaque ledge Mar 31, 2020, 5:52 PM

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@zenith wyvern what do you mean by consume tho, does the system actually destroys the event entity/tag ?

zenith wyvern Mar 31, 2020, 5:52 PM

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@zenith wyvern can you tell me an example on what you mean by event tag? Do you have one big event entity that you just add and remove tags from?
@junior fjord

It's not any kind of generic event system. I literally just have empty components that I use only for the purpose of being consumed by another system.

warped trail Mar 31, 2020, 5:52 PM

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system that creates Event just deletes it via ECB

junior fjord Mar 31, 2020, 5:53 PM

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@opaque ledge no by consuming I just mean that the system looks inside the event, gets the information and does something

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ah yeah maybe consuming is a bad word, it sounds terminal

zenith wyvern Mar 31, 2020, 5:53 PM

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@opaque ledge That's what I'm still figuring out. If I have the consumers destroy the event then I need to shift around where it gets destroy any time I add a new system to the chain. If I have the producer also destroy the event then obviously it can't know if other systems still need to consume it so it can only exist for one frame

opaque ledge Mar 31, 2020, 5:53 PM

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just reads it then ? thats easy to do

junior fjord Mar 31, 2020, 5:54 PM

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@fallow mason that could work, but maybe one needs to wait one frame more (so the deletion system has to see the event twice), because elseways I don't know at which point I create the event entities

opaque ledge Mar 31, 2020, 5:54 PM

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tbh, that sounds like a design flow, producer shouldnt care if there is a reader or not right ?

junior fjord Mar 31, 2020, 5:55 PM

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nobody cares if a system has read the event except the system itself @opaque ledge

opaque ledge Mar 31, 2020, 5:55 PM

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what i do is, i have a system that simply destroys the event via ECB and thats it, imagine i created the entity at begin or end commanbuffer, and that destroyer system will destroy the entity at end command buffer, since entity will not be destroyed instantly, other systems will be able to read it as well

junior fjord Mar 31, 2020, 5:55 PM

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I just add a ConsumedByX component in system X, s.t. X won't read the same event entity next frame again

opaque ledge Mar 31, 2020, 5:55 PM

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so there you go, 1 frame only event system

junior fjord Mar 31, 2020, 5:56 PM

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but only systems that run after the event is created and before the command buffer runs can read your entity

zenith wyvern Mar 31, 2020, 5:57 PM

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I think it's like Curly was saying, if an event needs to exist for more than one frame that's probably a flaw in design

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By definition the event should just exist for a single frame so systems can react to it then be destroyed.

fallow mason Mar 31, 2020, 5:57 PM

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trying to think of a situation that would require the event to survive longer a frame 🤔

zenith wyvern Mar 31, 2020, 5:57 PM

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Not because it's like "a rule" but because it makes things easier on the coder

junior fjord Mar 31, 2020, 5:58 PM

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@warped trail but what if the system that should read your event runs before you? Or you created the event entity from a MB?

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I don't want the event to survive longer than one frame

opaque ledge Mar 31, 2020, 5:58 PM

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@junior fjord thats where you are wrong, entity is instantiated only at ECB not instantly, so when you create the event it wont exist until frame is finished, therefore destroyer system wont be able to destroy it because it doesnt exist yet

warped trail Mar 31, 2020, 5:59 PM

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delete event at BeginInitializationECB, create events at EndInitializationECB ?🤔

zenith wyvern Mar 31, 2020, 5:59 PM

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If you only want it to exist for one frame then in your producing system you do: Destroy all existing events, then produce events

junior fjord Mar 31, 2020, 5:59 PM

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@opaque ledge ah wait, you instantly create and delete the same entity in the same ecb?

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can I do that?

opaque ledge Mar 31, 2020, 5:59 PM

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i dont instantly create it, i create it using ECB

junior fjord Mar 31, 2020, 6:00 PM

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yeah the instantly is completly wrong there 😄

zenith wyvern Mar 31, 2020, 6:00 PM

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@warped trail You don't need to create/destroy at different times. Just destroy first, then create immediately after

junior fjord Mar 31, 2020, 6:00 PM

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but how can I destroy it before it exists?

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I don't know the entity id yet

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and I can't change in which order the ecb does stuff?

zenith wyvern Mar 31, 2020, 6:00 PM

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That's what querying is for

warped trail Mar 31, 2020, 6:00 PM

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can you control when you destroy/delete entities via same ECB?

junior fjord Mar 31, 2020, 6:01 PM

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yeah if you could just give the command to destroy first and then create in the same ecb, that would be perfect

zenith wyvern Mar 31, 2020, 6:01 PM

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That's what I'm doing with my tags

opaque ledge Mar 31, 2020, 6:02 PM

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So something like:
EventProducerIssuedCreation->BunchOfSystems->EventReader(Couldnt read because event entity is not yet exist)->EventDestroyer(Didnt destroy because event entity is not created yet)->ECB(Event entity is created)->FrameFinished->BunchOfSystems->EventDestroyer(Issued destruction at ECV)->EventReader(Read successful because event entity is not yet destroyed)->ECB(Event entity is destroyed)->FrameFinished

warped trail Mar 31, 2020, 6:02 PM

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@zenith wyvern if i ecb.Create(entity) in one job and ecb.destroy(query) in another job(but parallel to the first one) what will be executed first?🤔

junior fjord Mar 31, 2020, 6:05 PM

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yeah maybe I should just create in BeginInitializationEntityCommandBufferSystem ecb and delete in EndPresentationEntityCommandBufferSystem

opaque ledge Mar 31, 2020, 6:05 PM

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yep basically

junior fjord Mar 31, 2020, 6:05 PM

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one automatically introduced a one-frame lag this way

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but I have no other good idea

warped trail Mar 31, 2020, 6:06 PM

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@junior fjord vice versa 😅

junior fjord Mar 31, 2020, 6:06 PM

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why vice versa?

fallow mason Mar 31, 2020, 6:06 PM

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because your event producer runs in between

zenith wyvern Mar 31, 2020, 6:06 PM

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@warped trail Well in your scenario you are running them in parallel so it's impossible to know. I'm saying you would do something like this:

var ecb = _endSimBarrier.CreateCommandBuffer();
ecb.RemoveComponent<EventTag>(_eventQuery);
// Produce events here via same ECB

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Ensure you destroy first then immediately produce

junior fjord Mar 31, 2020, 6:06 PM

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does the normal unity stuff run outside the ecs loop?

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@fallow mason

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if my event producer runs in dots, and creates in EndPresentationEntityCommandBufferSystem, then immeadiatly deletes in next frame start BeginInitializationEntityCommandBufferSystem , how would that work?

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or are you talking about user events (when does MB.Update happen in the loop actually?)

warped trail Mar 31, 2020, 6:08 PM

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delete every old event before EndPresentationEntityCommandBufferSystem in system, and new events will be created at EndPresentationEntityCommandBufferSystem

junior fjord Mar 31, 2020, 6:09 PM

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yeah or you delete in EndPresentationEntityCommandBufferSystem and create new ones in BeginInitializationEntityCommandBufferSystem right afterwards

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thats the same thing or not?

warped trail Mar 31, 2020, 6:09 PM

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Begin is before End 😅

junior fjord Mar 31, 2020, 6:09 PM

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begin of next frame

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can't I get the begin of the next frame?

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Never tried until now

zenith wyvern Mar 31, 2020, 6:10 PM

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Yes if you use the begin buffer inside SimulationGroup it will be played back next frame

junior fjord Mar 31, 2020, 6:10 PM

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yeah exactly

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ok perfect

warped trail Mar 31, 2020, 6:11 PM

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oh, didn't see Presentation part, this names are so long😅

junior fjord Mar 31, 2020, 6:11 PM

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only thing to optimize is the one frame lag in this method

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but for a strategy game that is probably irrelevant

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as long as I won't become the next starcraft which is of course possible

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😄

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thanks for all the help

zenith wyvern Mar 31, 2020, 6:15 PM

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The discussion clarified that for me too, you should always produce events in a BeginSim buffer and destroy them in EndSim buffer. Pretty obvious now that I think about it but I was mindflooding myself hard trying to work out these damn system dependencies

junior fjord Mar 31, 2020, 6:15 PM

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yeah stuff is often so obvious afterwards

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but why beginSim/endSim not beginFrame/endFrame?

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I have some systems running in initialization and presentation because I wanted the free sync points

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without creating some myself 😄

zenith wyvern Mar 31, 2020, 6:16 PM

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I guess you could use BeginInit buffer and EndPresentation buffer

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Depends where you need the event to be processed I guess

warped trail Mar 31, 2020, 6:18 PM

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i update simgroup at fixed rate, and I'm basically leaving some work to frame where simgroup won't be updated😅

amber flicker Mar 31, 2020, 6:18 PM

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err shouldn't always produce events in beginsim though right? if you want something to happen the same frame that you broadcast the event but require systems to run before knowing whether to broadcast or not

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just case-dependent

junior fjord Mar 31, 2020, 6:19 PM

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yeah I will also need to update some systems on a fixed rate, how do you do it @warped trail ? just my manually creating and ticking them?

zenith wyvern Mar 31, 2020, 6:19 PM

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I feel like trying to force the event to happen during the same frame is setting yourself up for too much of a headache

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That's true for me at least

junior fjord Mar 31, 2020, 6:19 PM

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@amber flicker that is what I meant with the 1-frame alg

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lag

amber flicker Mar 31, 2020, 6:20 PM

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it doesn't need 1 frame of lag - you can e.g. still destroy event at end of sim

warped trail Mar 31, 2020, 6:20 PM

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@junior fjord loot at fixedrateutils

amber flicker Mar 31, 2020, 6:20 PM

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for my stuff that's how I need it to work

zenith wyvern Mar 31, 2020, 6:20 PM

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System dependencies are already annoying enough without trying to line up asynchronous events to happen within the same frame

fallow mason Mar 31, 2020, 6:20 PM

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yeah, won't work if you have a subscriber system already run before your producer

junior fjord Mar 31, 2020, 6:20 PM

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but what if systems that ran before the event happened need to know about it @amber flicker ?

amber flicker Mar 31, 2020, 6:21 PM

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then your destroy event job should run just before it creates new ones

junior fjord Mar 31, 2020, 6:21 PM

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yeah this is exactly the solution with beginframe and endframeecb

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forgot the real names

zenith wyvern Mar 31, 2020, 6:23 PM

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Also in my case my events are components, so if I needed it to happen the same frame i would need to force a structural change during simulation, which immediately forces all jobs to complete

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Not ideal

amber flicker Mar 31, 2020, 6:24 PM

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as an example.. with my tween stuff.. say a tween has a delay of 1s before it starts.. the time system runs and updates the time of the tween, then if t = 0 let's say a 'start' tag gets added - I need to make sure e.g. an 'OnStart' event is then fired that exact frame.. same with tween completion etc - not everything requires same-frame accuracy obviously

warped trail Mar 31, 2020, 6:24 PM

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pretend that there is no 1 frame lag, but you know what will happen 1 frame in the future😏

junior fjord Mar 31, 2020, 6:24 PM

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did EndPresentationEntityCommandBufferSystem get renamed? rider tells me it can't find it

warped trail Mar 31, 2020, 6:24 PM

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@junior fjord they deleted it

junior fjord Mar 31, 2020, 6:24 PM

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oh 😄

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haha ok then my systems in the presentation group can't get events

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but I guess they shouldn't need them anyways

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or hmm, where do you guys run the systems that rebuild meshes etc?

zenith wyvern Mar 31, 2020, 6:26 PM

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Mine just runs in SimulationGroup

junior fjord Mar 31, 2020, 6:26 PM

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pretend that there is no 1 frame lag, but you know what will happen 1 frame in the future😏
@warped trail good way to put it on your resume 😄

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I already know what this small program will output in 2 minutes

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@zenith wyvern ok I had them in presentationgroup up to know since it does not fit my feeling of what should go in simulation

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but I could put them there too ofc

warped trail Mar 31, 2020, 6:27 PM

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i interpolate things, so what you see is what happened some time ago😅

junior fjord Mar 31, 2020, 6:27 PM

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😄

warped trail Mar 31, 2020, 6:29 PM

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after i saw true smooth motion, i see jitter everywhere😕

junior fjord Mar 31, 2020, 6:31 PM

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is there a reason it is called SetComponentData in entityManager and SetComponent in the ecb?

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do they do different stuff?

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ah wait about the idea with deleting it in EndFrameBuffer and creating it in StartFrameBuffer, did anyone actually implement that?
BC the Entity ref you get when creating it in StartFrameBuffer is just a temporal one, and I don't think EndFrameBuffer can work with the temporatl Entity refs that StartFrameBuffer created?

warped trail Mar 31, 2020, 6:35 PM

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just delete whole query😅

junior fjord Mar 31, 2020, 6:35 PM

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ah ok but then I need a an own deletion system right

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yeah ok but that is less work than always also giving the deletion command

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😄

zenith wyvern Mar 31, 2020, 6:36 PM

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No. _endSimBarrier.CreateCommandBuffer().RemoveComponent(_eventComponentQuery);

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That can be in the same system

mint iron Mar 31, 2020, 6:37 PM

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is there a reason it is called SetComponentData in entityManager and SetComponent in the ecb this drives me crazy :S i know it shouldn't but it does.

warped trail Mar 31, 2020, 6:40 PM

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when you change your ecb to entitymanager and have to rename all those methods 😅

junior fjord Mar 31, 2020, 6:46 PM

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ok so basically I just need to call endSimECB.DestroyEntities(allEntitiesWithEventTag) somewhere each frame?

zenith wyvern Mar 31, 2020, 6:47 PM

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I hope they fix things like that while they still have a chance. There's lots of weird API stuff right now like the Job structs Schedule being different from SystemBase Schedule. Or all the ComponentSystems we have now. They should have just replaced the old ComponentSystem with what SystemBase is now

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Now we're stuck with all these deprecated and confusing names for systems

warped trail Mar 31, 2020, 6:50 PM

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@junior fjord maybe create some system which will run at the end of frame , if you have event entities 🤔

junior fjord Mar 31, 2020, 6:51 PM

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yeah that does sound like the easiest way out

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how do I make it run as late as possible?

warped trail Mar 31, 2020, 6:51 PM

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run it in PresentationSystemGroup?

junior fjord Mar 31, 2020, 6:52 PM

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yeah ok sure

zenith wyvern Mar 31, 2020, 6:52 PM

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Why create a separate system? What's wrong with endSimECB.DestroyEntities(allEntitiesWithEventTag)?

junior fjord Mar 31, 2020, 6:52 PM

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where do you run that command @zenith wyvern

fallow mason Mar 31, 2020, 6:52 PM

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Yeah I agree @zenith wyvern if there's any time to have breaking changes it's now when no one should be using this for production. Just kill ComponentSystem and require it to be SystemBase.

junior fjord Mar 31, 2020, 6:52 PM

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basically it doesnt make a difference I guess

warped trail Mar 31, 2020, 6:53 PM

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why create ecb if you don't have to?😅

zenith wyvern Mar 31, 2020, 6:53 PM

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Less code to write

fallow mason Mar 31, 2020, 6:53 PM

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Also confusing to have both when everyone is trying to learn

junior fjord Mar 31, 2020, 6:53 PM

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the endSIMECB exists for me anyway

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ah no ok I get it

zenith wyvern Mar 31, 2020, 6:53 PM

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where do you run that command @zenith wyvern
@junior fjord

Wherever, I would put it in whatever system produces your events

junior fjord Mar 31, 2020, 6:54 PM

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there are multiple systems

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but yeah I can just put it somewhere 😄

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are command buffers so expensive? If the sync point already exists anyways?

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I mean the update loop of the deletion system would also have to be run

zenith wyvern Mar 31, 2020, 6:56 PM

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No, the expensive part is the actual structural changes. Creating the command buffers and playing them back is almost nothing

fallow mason Mar 31, 2020, 6:57 PM

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And what's this SystemBase nonsense. Should just be called System imo 😉

zenith wyvern Mar 31, 2020, 6:57 PM

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@fallow mason Yeaeaahh... the actual base class is ComponentSystemBase, but ComponentSystem is now deprecated, and SystemBase isn't actually a base class at all.

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Quite a mess

formal scaffold Mar 31, 2020, 7:01 PM

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How do you solve the problem with Player Input? I have an InputSystem collecting Input. And I have a VelocitySystem calculating velocity. But I want that system to calculate the velocity of every Entity with a velocity component, including the player.

But the velocity of the player is dependend on the Player Input and the velocity of every other entity is dependend on a "target".
I could use ```cs
if(playerInput.Exists(entity))

But that seems very inefficient to me when iterating over a large number of entities. 

I am considering splitting up the VelocitySystem into two, one for the player and one for every other entity. What do you think?

zenith wyvern Mar 31, 2020, 7:03 PM

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Splitting the velocity calculation into two systems is how I do it. Players calculate velocity differently from ai, it's that simple I think

formal scaffold Mar 31, 2020, 7:03 PM

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Thanks 👍 might be the best idea

junior fjord Mar 31, 2020, 7:11 PM

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where do you guys dispose your nativearrays? is there an easy way to just wait until all jobs are done and then dispose all?

warped trail Mar 31, 2020, 7:12 PM

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.Dispose(JobHandle)😅

fallow mason Mar 31, 2020, 7:13 PM

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@formal scaffold I don't know if this is possible with your game, but you could convert the player input into a target. Both my player and npcs use targets and share one movement system.

junior fjord Mar 31, 2020, 7:14 PM

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@warped trail but what do you input as jobhandle? Do you actually check for each nativearray which job is the last one using it?

fallow mason Mar 31, 2020, 7:14 PM

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my input is just a mouse click which creates a target where I click, but WASD keys could create a target at the player position + float.forward, right, etc

junior fjord Mar 31, 2020, 7:14 PM

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I have quite a few global nativearrays that store data about the tiles since that seemed way easier than putting the data in chunks and with a good indexing scheme it should even be more performant than having it in chunks

formal scaffold Mar 31, 2020, 7:15 PM

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Hmm thanks for the Idea, I haven't considered that. Sounds just as good I'll think about it

mint iron Mar 31, 2020, 7:19 PM

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where possible i use a persistent NativeList and resize it to whatever size array i need and copy, since they can be implicitly converted to NativeArray.

zenith wyvern Mar 31, 2020, 7:20 PM

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I have quite a few global nativearrays that store data about the tiles since that seemed way easier than putting the data in chunks and with a good indexing scheme it should even be more performant than having it in chunks
@junior fjord

For a global array you can use EntityManager.CompleteAllJobs() before you dispose

verbal pewter Mar 31, 2020, 7:21 PM

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Hey all, I'm at the start of working on an AI framework for my project and am planning to go with a Utility Based AI framework. Having some trouble figuring out how to structure things for ECS. I'm trying to keep the option for modding open, and ideally even runtime editing if possible.

To get into more specifics, with Utility Based AI, agents have a list of actions they're allowed to complete. Actions have a list of considerations that get evaluated to determine how good that specific action is compared to all the others. So, agents have a list of actions, actions have a list of considerations.

Adding the list of actions to agents is easy enough using a DynamicBuffer. What I'm struggling to figure out is the best way to handle the case of nested lists like in my situation. My first thought is to make actions into entities with their own dynamic buffer that stores the list of considerations, but I'm not sure if this is an appropriate use of entities? Actions will be more-or-less persistent, with some created/destroyed occasionally. Won't be an every frame kind of thing.

junior fjord Mar 31, 2020, 7:22 PM

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@zenith wyvern thanks!

zenith wyvern Mar 31, 2020, 7:32 PM

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@verbal pewter Are the "considerations" things that you author once or are they created on the fly? You could just make your actions into BlobAssets, which can have nested lists

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Or you could store a FixedList of considerations in your Actions

junior fjord Mar 31, 2020, 7:33 PM

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I also think that if the actions are persistent and are shared between agents, then having action entities could be the right way

coarse turtle Mar 31, 2020, 7:34 PM

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or build your own data structure to house that kind of data if you cant flatten it into a 1d array or a collection of 1d arrays

zenith wyvern Mar 31, 2020, 7:35 PM

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If you've figured out how you want the modding side to work, IE how you're actually going to author your actions in the editor, that should better inform the best way to represent it in ECS

junior fjord Mar 31, 2020, 7:43 PM

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I have no idea on how to approach modding in general. What should I think about to make my game moddable?

mint iron Mar 31, 2020, 7:50 PM

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I worked with a modding system that was pretty flexible; they used roslyn compiler to pickup .cs files in a sub-directory that implement an interface.

verbal pewter Mar 31, 2020, 7:51 PM

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@zenith wyvern Considerations are hard coded, but I need to store and pass settings info for each consideration instance. So, the logic of them is shared between all considerations of the same type, but the result depends on the settings that are passed which get assigned once when the Action is created.

I'll need to look into BlobAssets a bit more then. Not super familiar with them.

As for FixedList, from my understanding the type used needs to implement ICompareable. There's no obvious way to compare to compare considerations (unless I've misunderstood ICompareable completely).

And, yeah, it's too early to say about the modding framework. I'm still in early days on this and am just trying to prevent myself from coding myself into a corner down the line.

zenith wyvern Mar 31, 2020, 7:54 PM

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The type used in FixedList doesn't have any constraints aside from being unmanaged

junior fjord Mar 31, 2020, 7:57 PM

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how can unity warn me that a nativearray has not been disposed, allthough I have set it in one of my static global classes?

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it has not been disposed since I am still using it

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but there also still is the reference, since Globals.Array points to it

verbal pewter Mar 31, 2020, 7:58 PM

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@junior fjord Hmmmm, that's a good point. I think ideally the actions would be shared within each agent type, since they'd have the same settings. I'm not 100% certain right this moment, but I don't think I need to store any entity specific data in an action. Need to get a little further along on this to be sure though.

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@junior fjord From my understanding the editor should throw an error in play mode, right?

junior fjord Mar 31, 2020, 8:01 PM

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yes it throws an error but I don't understand why

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the nativearray still has references pointed to it, so why should I deallocate it

verbal pewter Mar 31, 2020, 8:01 PM

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Ah sorry, I misread your question.

opaque ledge Mar 31, 2020, 8:01 PM

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@verbal pewter
I have very primitive AI, but maybe the idea can help

I have bunch of 'request' systems and 'action' systems,
request makes a request to brain that their action should be done, my request struct is basically an enum and an int for priorty
action has WithAll paramater according to what enum they represent, so my idle request is State1, so my idle action has WithAll<State1>

My trade space ship has 2 states for example:
Idle request giving request Request{enum=State1, priority=1} at every frame
Avoid enemy request giving Request{enum=State2, priority=2} when there is an enemy in vicinity

So i am giving these requests to a dynamic array

So in my brain system basically inspect that dynamic array and chooses the action that has most priority, It checks if previous action is the same action, if so then it does nothing, if different than it removes previous action's tag and adds the new action's tag and thats it.

Also enum indicates state's tag, So enum.State1 represets State1Tag, enum.State2 represents State2Tag etc..

junior fjord Mar 31, 2020, 8:02 PM

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@verbal pewter if your actions don't change through the game and are read-only you could also just do an array with the action information and have the entities store indexes into the array

opaque ledge Mar 31, 2020, 8:02 PM

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its however kinda hardcoded, but not the action/requests themselves, they just represent a tag component so your ai can be driven by WithAll, WithNone parameters

verbal pewter Mar 31, 2020, 8:04 PM

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@junior fjord Yeah that's a good point. I've done that for some other "settings" data structures. Gotta work a bit further to see if that's possible. Definitely better than creating entities if I don't have to.

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@opaque ledge Thanks for the idea. I'm pretty set on going with a utility based AI approach atm.

opaque ledge Mar 31, 2020, 8:07 PM

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idk what utility based exactly, but yeah hope it helps

formal scaffold Mar 31, 2020, 8:09 PM

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Hmm, sorry so many Questions toaday but im still learning 😅
I want my MovementSystem to be dependend on my RotationSystem in a way that. When rotation is > 150°, don't update Movement for that Entity.
I did read about Write Groups and I was wondering how you do it? Meaning one System being dependend on another?

I would add a component to that Entity and my MovementSystem wont update because the Entity is now in a WriteGroup

opaque ledge Mar 31, 2020, 8:11 PM

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i think WriteGroup is more for based on existence of certain components, not based on the values of certain components

formal scaffold Mar 31, 2020, 8:12 PM

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The RotationSystem would add an empty "WaitForRotation" component. Haven't thought further because i'm unsure if this is a good approach

opaque ledge Mar 31, 2020, 8:12 PM

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You probably could have a component just for this issue, your rotation system could set a flag(bool) in that component, and your movement system could read that flag and update or not

warped trail Mar 31, 2020, 8:14 PM

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@formal scaffold i think it will be faster to just cs if(rotation > 150°) return; ///Your Update movement code

formal scaffold Mar 31, 2020, 8:14 PM

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I'm worried about the overhead that adding / removing of components on entities causes. I would certainly use the EntityCommandBuffer for that but still. I somehow need to wait and it has to be two systems not one

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@warped trail That would cause the problem next frame tho since I update the angle every frame. Once I am below 150° I would move again.

I want to rotate fully, then move, once at desired rotation

warped trail Mar 31, 2020, 8:17 PM

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once you get your rotation > 150° you don't want to move until you get your rotation to 0° ?

formal scaffold Mar 31, 2020, 8:19 PM

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Yeah I want to restrain movement basicly on 180° turns. So far I manage it like this

                if (angle > 150) {
                    waitForRotation = true;
                    velocity.Linear = float3.zero;
                }

                if(!waitForRotation) {
                    rotation.Value = math.slerp(rotation.Value, targetRotation, 0.1f);

                    velocity.Linear = math.lerp(velocity.Linear, direction * magnitude * movementSpeed, 0.1f);
                } else {
                    var currentRotation = rotation.Value;
                    rotation.Value = Quaternion.RotateTowards(rotation.Value, targetRotation, 40);
                    if (rotation.Value.value.y == targetRotation.value.y) {
                        waitForRotation = false;
                    }  
                }

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Still ugly code but basicly,
angle > 150 -> wait for rotation -> rotate to target position -> move again

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Works quite well so far but I have to split this code into two systems

warped trail Mar 31, 2020, 8:24 PM

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you can create waitForRotation component and make movement foreach .WithNone<waitForRotation >🤔

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but is it worth it?🤔

verbal pewter Mar 31, 2020, 8:26 PM

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@zenith wyvern Hmm, I'm away from my computer so I'll have to dig into it later, but I tried playing around with them a while back and came to that conclusion about the ICompareable requirement. Can't remember the context that led me to that though, sorry. Before shutting down for the day I had a "there's no boxing conversion" error on the struct I tried using as the type of the FixedList. I was done for the day so I didn't get into it any further.

fallow mason Mar 31, 2020, 8:26 PM

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can't you just in Rotation rotation in your movement system and just do the same checks in both systems?

#

I guess you'll need the target angle too

formal scaffold Mar 31, 2020, 8:30 PM

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Not sure, I would do that with every NPC, Enemy and player in the game. I wouldn't have to Iterate over those Entities, meaning I gain perfomance. But I create overhead by adding/removing those components within the EntityCommandBuffer.

As of right now I have an If() check every frame for every Entity that moves. Some time ago I read here that If() checks slow down Jobs and or Systems, So I'm worried about that too

warped trail Mar 31, 2020, 8:31 PM

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premature optimization is evil😄

formal scaffold Mar 31, 2020, 8:33 PM

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I know 😄 but I can't help it. If I learn about the Pros and Cons now, in my mind, I will be faster in the future.
It's hard tho, feels like 99% thinking and 1% coding😒

zenith wyvern Mar 31, 2020, 8:37 PM

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Just focus on writing code that works and is easy for you to understand. Worry about performance when you have solid knowledge of the tools - and more importantly when there is an actual tangible performance problem

opaque ledge Mar 31, 2020, 8:37 PM

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ALWAYS make your code run properly first, worry about performance later

warped trail Mar 31, 2020, 8:38 PM

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i think you are trying to solve nonexistent problem😅

formal scaffold Mar 31, 2020, 8:42 PM

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Maybe you are right I will try to focus more on writing understandable code.

fallow mason Mar 31, 2020, 9:13 PM

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so is the visual scripting for DOTS supposed to use GO/MB terminology and do DOTS things behind the scenes?

opaque ledge Mar 31, 2020, 9:14 PM

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its for DOTS

fallow mason Mar 31, 2020, 9:15 PM

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Right. But there are no nodes that use any dots terminology. Instead it's things like gameobjects parents, getcomponent, etc.

opaque ledge Mar 31, 2020, 9:16 PM

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oh, i wouldnt know of that, havent tried

warped trail Mar 31, 2020, 9:41 PM

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there is like 0 thing from ecs😕

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this new thing is like visual scripting for monobehaviour🤔

opaque ledge Mar 31, 2020, 9:49 PM

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🤔

fallow mason Mar 31, 2020, 9:53 PM

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I thought I'd be able to visually design systems. Maybe it's going to be a way for people to get DOTS benefits without learning new paradigm? No idea how they're going to convert data that hasn't been prepared for it though.

opaque ledge Mar 31, 2020, 10:09 PM

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yeaah, i just read awesomedata's posts, it kinda made me sad a little

formal scaffold Mar 31, 2020, 10:14 PM

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Which posts do you mean @opaque ledge?

opaque ledge Mar 31, 2020, 10:19 PM

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about drop 8 in forums

dull copper Mar 31, 2020, 10:28 PM

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https://forum.unity.com/threads/dots-visual-scripting-experimental-drop-8.857707/#post-5654431

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no idea if it's really bad tho, would need to test it oneself to make that call

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if there's anything I've learned in past years is that people always resist change

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so if they've gotten used to something, new approach will always put them off

fallow mason Mar 31, 2020, 10:30 PM

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I knew it! I could have sworn there was a shader graph style output or input bar in a previous version.

warped trail Mar 31, 2020, 10:31 PM

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you can't do any ecs stuff with this new drop😕

dull copper Mar 31, 2020, 10:31 PM

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In order to iterate at a better pace we came to the conclusion that we needed to put aside codegen at least temporarily. We are not sure yet if we will bring it back as originally implemented since we have other very performant options that we would like to evaluate first.

fallow mason Mar 31, 2020, 10:32 PM

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Yeah from my tests, I have no idea how I would design equivalent functionality of my current systems in the visual editor. There just simply aren't the necessary nodes.

dull copper Mar 31, 2020, 10:32 PM

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Also, this is very "anti-DOTS": Also temporarily ignoring performance optimization and focusing on the feature set.

warped trail Mar 31, 2020, 10:32 PM

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We want to converge back to that kind of feature eventually, but we've been focusing on actual usecases from real world clients/users, hence the current feature set. ```

dull copper Mar 31, 2020, 10:33 PM

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I totally hate this mindset for the design

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UE4's blueprints strength is that it's like actual programming language, things you do there translate to text based coding almost 1:1, just with less boilerplate

fallow mason Mar 31, 2020, 10:34 PM

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So they weren't forgetting to mention the visual editor was DOTS only in the roadmap video lol

dull copper Mar 31, 2020, 10:34 PM

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if you need to "dummify" and create higher level thing, you could just have helper functions

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that being said, UE4 does do some things on their bluprints like this, basically implement some feats on single node that would take 10 lines of c++ normally

warped trail Mar 31, 2020, 10:35 PM

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meet new Object Oriented Technology Stack 😏

dull copper Mar 31, 2020, 10:35 PM

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I'm just happy I never really cared much of the visual scripting in the first place 😄

fallow mason Mar 31, 2020, 10:35 PM

#

OOTS has a nice ring to it

dull copper Mar 31, 2020, 10:36 PM

#

only reason to want it in past would have been to get less boilerplate

#

but current DOTS is getting that aspect quite covered now

safe lintel Mar 31, 2020, 10:46 PM

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is just dropping ecs stuff for gameobjects just to test the actual flow of the visual scripting?

fallow mason Mar 31, 2020, 10:52 PM

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Definitely possible. DOTS is a moving target. MBs are mature and the API is unlikely to change much. Better candidate for something like this in early development.

dull copper Apr 1, 2020, 1:12 AM

#

any npm experts here? my google fu is failing me on how to list all package on the registry

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I can poll individual packages if I know their names

#

also totally not a topic for DOTS specifically (but I'm mainly using this to poll DOTS packages)

fallow mason Apr 1, 2020, 1:15 AM

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can you parse that JSON that Topher posted to gather the names and poll for each?

dull copper Apr 1, 2020, 1:18 AM

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I can but I can also use npm to get the info easier

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actually download the packages so I can automatically extract changelogs etc

fallow mason Apr 1, 2020, 1:19 AM

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Disclaimer: not at all an NPM expert, but decent at google: replicate? https://stackoverflow.com/questions/48251633/list-all-public-packages-in-the-npm-registry

Stack Overflow

List all public packages in the npm registry

For research purposes, I'd like to list all the packages that are available on npm. How can I do this?

Some old docs at https://github.com/npm/registry/blob/master/docs/REGISTRY-API.md#get-all men...

dull copper Apr 1, 2020, 1:19 AM

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that was like first google hit when I tried to search it 🙂

fallow mason Apr 1, 2020, 1:19 AM

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lol

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and I'm guessing that doesnt work

dull copper Apr 1, 2020, 1:20 AM

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https://packages.unity.com/_all_docs

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and nope. it doesn't work

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for tiny it would be simple as they got https://packages.unity.com/com.unity.tiny.all

fallow mason Apr 1, 2020, 1:24 AM

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hmm i see

dull copper Apr 1, 2020, 1:24 AM

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anyway, there is a command to actually list all these on commandline

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I've done it in past but I can't remember the command :/

sour ravine Apr 1, 2020, 1:40 AM

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can blob assets hold ScriptableObject/Object references?

mint iron Apr 1, 2020, 2:00 AM

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you'd probably have to pin them

sour ravine Apr 1, 2020, 2:08 AM

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not the end of the world, they're actual asset files

mint iron Apr 1, 2020, 2:12 AM

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yeah.. you're right come to think of it, if they're treated anything like GameObjects and components.. which are they're native side allocated and don't seem to move. I once mapped out the struct for Transform in x64dbg and i didn't see it move at all.

coarse turtle Apr 1, 2020, 2:19 AM

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Hmm anyone seen this error before?

Something went wrong while Post Processing the assembly (Arena.Server.dll) : 
 Object reference not set to an instance of an object 
  at Mono.Cecil.ImportGenericContext.TypeParameter (System.String type, System.Int32 position) [0x00000] in <58b86858c52b4b5fbb6efedd16c9c16a>:0 
...
at Unity.Entities.CodeGen.PropertyBagPostProcessor+GeneratedPropertyBag.GenerateStaticFields () [0x003cc] in D:\Documents\Projects\Unity\ProjectArenaServer\Library\PackageCache\com.unity.entities@0.8.0-preview.8\Unity.Entities.CodeGen\PropertyBags\PropertyBagsPostProcessor.cs:501

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Happens to only be an issue during a build process :/

bright sentinel Apr 1, 2020, 6:16 AM

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@dull copper Maybe you can use this and use this and search for everything? https://docs.npmjs.com/cli-commands/search.html

indigo delta Apr 1, 2020, 7:17 AM

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https://www.udemy.com/course/unitydots/ this just dropped today

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The first few videos are free still https://www.youtube.com/playlist?list=PLi-ukGVOag_129NcrH5nHtgvkHBlSAwNk

gusty comet Apr 1, 2020, 9:37 AM

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this new visual scripting stuff is terribly disappointing. After years of development and the scramble to switch to a conversion workflow, I had an inkling that things might go this way, but was hoping that it wouldn't be the case...

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this casts a big shadow of doubt to the future of dots for me, it feels like compromises will not simply end with visual scripting

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even if it was alpha and clunky, I had high hopes for dots. I still do, but I've seen this picture too many times in unity (UI, networking, input, etc)

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things are getting scaled back repeatedly? First it was full dots, then it was conversion workflow, now no dots terminology in visual scripting. I think it isn't a stretch to worry about other things getting scaled back at this point.

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I remember there were talks of doing full dots editor with dots specific authoring tools, piggy backing on the project tiny, conversion workflow was brought in later, then it became the primary focus

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gameobjects themselves aren't inherently scalable, they are just one way of authoring

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if you want to ignore my point entirely and completely disregard the unity's trackrecord of scaling things back, well, more power to you

warped trail Apr 1, 2020, 10:06 AM

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but this new visual scripting is looking just like dropping a new entity in the editor and pressing play😅

gusty comet Apr 1, 2020, 10:18 AM

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| even if we had 0 game objects, it would still be authoring data -> entities

there is a big difference between relying on clunky gameobject workflow and authoring data

warped trail Apr 1, 2020, 10:18 AM

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all DOTS talks is like Don't think about objects, think about data, all mentions about visual scripting is It is built specifically for DOTS. And what i see in current release of VS Don't think about data, think about objects 🤔

gusty comet Apr 1, 2020, 10:19 AM

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the conversion workflow is inferior both in authoring and in gameplay coding since it requires extra steps that require specific knowledge to get through the edge cases. And edge cases happen a lot in game development

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the first design that tried to make things entity oriented wouldn't have had those problems baked in

#

you would still have great authoring and great programming experience without the additional gameobject layer that is thrown in

#

yes, thats right, it was a dots editor

#

and that was, guess what, gasp scaled back

#

not necessarily, if unity went all in like they said they would, there would've been bigger changes

#

instead, unity developed it along side new ui, new asset management, new input, but made those things completely non-dots

#

development has been going on for nearly 3 years now

#

just when everyone thought things were ramoing up, bam, conversion workflow

#

I have issues when it comes to conversion workflow, it is too clunky and too detached from the dots code. One of the primary strengths of Unity and C# was the near 1:1 relationship between authoring and coding

#

now I have to guess what is happening on the background and go in and decipher

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sure that'll get better with time, but honestly I really don't like the idea of managing edge cases all the way to the heaven

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well, you keep ignoring my points and keep going on with your what aboutism

vagrant surge Apr 1, 2020, 10:25 AM

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one problem with the authoring workflow is having to dynamically convert prefabs

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or use the subscenes

#

would be nice to have a ecs native prefab

#

the main issue i see with it is the general jank of it

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you go from old unity, of plopping a game object and giving it a comp

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vs making sure to have the subscenes and live link and conversion properly set

#

conversion is still very useful for a lot of things like static objects, but needing to do it for everything is not best workflow

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or well, just look at Entitas and compare usability

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pretty much. Or at least close-ish

#

thats one of the main reasons people like unity after all

#

of course, but i wonder whats the decision against having something like entitas does, which seems not so hard to do (i mean entitas code is not that hard), and yet solves hybrid fairly well

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it would act as a stepping stone for teams

#

for reference

📎 unknown.png

#

from the 2015 presentation on entitas

#

it makes hybrid massively easier

opaque ledge Apr 1, 2020, 10:38 AM

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the only 'problem' i have right now is i cant create entity prefab, my workflow is like this, i create a MB and in it's start method i convert game object to an entity thru conversation utility and put it into shared static to be able to use it inside a bursted job, but i heard run time conversation will be dropped later on so my workflow wont work when that happens

vagrant surge Apr 1, 2020, 10:38 AM

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what i personally think would be a great way to do it, is to start with this sort of "hybrid" component, where you can add ecs components into a normal gameobject, to simplify hybrid. After it, if possible, have entities as a "separated" object in the normal editor. So you can either create a gameobject, or an entity, and the editing is almost the same. Polish conversion workflow alongside it

opaque ledge Apr 1, 2020, 10:39 AM

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yay 😄

#

👍

vagrant surge Apr 1, 2020, 10:39 AM

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@digital scarab eagerly awaiting for the prefab thing 👍

north bay Apr 1, 2020, 10:39 AM

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Same

fallow mason Apr 1, 2020, 10:44 AM

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I keep seeing unity people saying the 1:1 entity creation workflow would be less performant, but I simply don't understand the reasoning. Sure there would be processing overhead in the editor but the data representation would still be the same and we're already told to profile in the player 🙄

vagrant surge Apr 1, 2020, 10:44 AM

#

@fallow mason there is a lot of fun stuff you do in the conversion

#

conversion being natively supported is actually great

#

unreal doesnt have this and its harmed by it

fallow mason Apr 1, 2020, 10:45 AM

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Like creating multiple icds with one authoring comp, you mean?

vagrant surge Apr 1, 2020, 10:45 AM

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obvious example is imagine you have a survival game, where you have a massive forest in the editor. This forest uses individual game objects per tree, just so the trees can be cut and are dynamic

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on conversion workflow

#

fuck that

#

you convert the entire forest into an octree

#

and pool the actual renderables

#

so instead of having to load a lot of game objects, you save the "presets" of the trees in a table, and the locations in some sort of flattened octree

#

then at runtime, you load this flattened binary octree + the preset table, and "stream" the trees around the player, by actually instantiating stuff only in a radius

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and using inpostors for far away

#

you cant do this on unreal at the moment, not natively without custom editor tools. Makes you wonder why Ark and Conan perform as bad as they do

fallow mason Apr 1, 2020, 10:48 AM

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That is cool. I'm not advocating the removal of conversion. It's worked well for me. Just that there are some cases where it would be better to just construct the entity directly in the editor.

vagrant surge Apr 1, 2020, 10:48 AM

#

constructing directly is basically how its going to be for a big mayority of things

#

another of the things you can do on conversion workflow, is that when you add an "enemy" to the map, it doesnt save the enemy. It just saves the point. The enemy gets spawned and activated when the player gets close

#

lots of fun things like that can be done

dull copper Apr 1, 2020, 10:50 AM

#

@bright sentinel that was the second google hit 😄

#

I think that's the right command, but Unity's npm registry doesn't seem to support it

#

or alternatively the tool I have misses something

#

all in all, it can't search anything from unity's registry

#

also re: conversion workflow, I totally dislike it. If it would actually work nicely with DOTS packages, like even with Unity physics, I'd be ok with it as intermediate step to some future DOTS editor in few upcoming years (it's very clear we are not getting it any time soon)

#

it's just, this thing breaks in all directions on my use and I keep constantly fighting the conversion stuff

#

it's like the single biggest time consuming thing on DOTS atm

#

I can totally see why most advanced users try to avoid it and write authoring tools that bypass the whole conversion, it's just not a great workflow at all

#

I wouldn't be surprised if stuff like this will keep majority of Unity users away from DOTS, either people try it and find it cumbersome or other users who use it warn them about this stuff and they don't even try it. Something has to change

vagrant surge Apr 1, 2020, 11:00 AM

#

thus why i think something like what entitas has (easy way to add a sibling entity with comps to a gameobject) is a great stepping point

gusty comet Apr 1, 2020, 11:00 AM

#

Are you guys converting subscenes or prefabs?

vagrant surge Apr 1, 2020, 11:00 AM

#

allows people to add some components for small stuff incrementally

dull copper Apr 1, 2020, 11:00 AM

#

dots subscenes break in all directions with current physics stuff so I'm not touching them until they can stabilize it more

#

which totally sucks and DOTS editor packages live entity conversion preview (not to be confused with the full ecs editor concept) only works in DOTS subscenes

#

does DOTS subscenes now support those experimental hybrid gameobjects?

#

because in past, having no GO's on subscene was a huge PITA if you needed to still use gameobjects

#

also remember that you can't even do cross scene references so you can't ref GO's on GO scene from DOTS subscene (this isn't DOTS related limitation, it's just limitation in general in unity between subscenes)

vagrant surge Apr 1, 2020, 11:04 AM

#

that sort of thing is perfectly normal

#

subscenes only hold references to inside stuff

#

without that it becomes a huge mess

dull copper Apr 1, 2020, 11:05 AM

#

IMO this current setup already is 🤔

#

anyway, it's kinda hard to judge current state of DOTS as it's clearly still really wip and raw

#

would realistically need to wait for 2-3 more years and then see where they end up

#

it just feels that they have to do something to keep people still interested on this

vagrant surge Apr 1, 2020, 11:08 AM

#

there were some DOTS talks by mike acton on gdc that got cancelled 😦

warped trail Apr 1, 2020, 11:08 AM

#

my main concern is a lack of tools to quickly create components, which i can just drag and drop to objects in scene

vagrant surge Apr 1, 2020, 11:08 AM

#

was specially hyped for the "how to make an ECS" one

#

as that could explain some of the design decisions unity has

warped trail Apr 1, 2020, 11:09 AM

#

i have to block Unity's compilation to create some scripts without waiting 😕

fallow mason Apr 1, 2020, 11:50 AM

#

The main annoyance for me is having to either write a conversion script (that often just straight copies the MB value to the ICD) or write a script that creates an entity from archtype on start, just to have an entity with some component data in there when I press play.

#

And yes, the other option is GenerateAuthoring, but the drawback with that is you can't have all these little components in one file.

#

All to say it's not a deal breaker, but it sure is annoying that I can't just add icds to an entity like I can add MBs to a GO.

mint iron Apr 1, 2020, 12:19 PM

#

My frustration is the lack of wider integration. How do you handle integration with UI? sound? cameras? animation? asset streaming/bundles/updates? there are very few viable connecting pieces right now. Maniuplating shaders in URP is finally coming for us which im excited about. But its the holes everywhere that you start to fall into once you get beyond spawning a million cubes.

stiff skiff Apr 1, 2020, 1:19 PM

#

Is there a release date for 0.9.0? Its really frustrating that Android is failing to compile in 0.8.0.

wary anchor Apr 1, 2020, 1:35 PM

#

When using an ECB in a job, can I still delete the entityQuery as soon as OnUpdate starts (ie does the int entityInQueryIndex require the entityQuery to still be around?)

pliant pike Apr 1, 2020, 1:36 PM

#

why not try it and find out?

wary anchor Apr 1, 2020, 1:37 PM

#

Only because I'm mid refactor and have quite a long way to go before I get back to a testable point, just wondered if anyone knew off the top of their head

warped trail Apr 1, 2020, 1:40 PM

#

entityQuery will be destroyed when you playback ECB🤔

wary anchor Apr 1, 2020, 1:43 PM

#

In my old systems, I was using eg:

protected override JobHandle OnUpdate(JobHandle inputDeps)
{
  EntityManager.DestroyEntity(entityQuery)
//Then do stuff so it only happens once
}

just confused now I'm switching things over to SystemBase with this enforced name int entityInQueryIndex - if I've already used the EntityManager to delete the query above the job, does that affect this index that the ECB uses for playback?

#

I guess it boils down to: can I be guaranteed that the ECB playback will happen all within one frame, ie before the next OnUpdate is called if I switch over to destroy the entity within the ECB instead of the above method?

opaque ledge Apr 1, 2020, 1:45 PM

#

i dont think ECB accepts entity query 🤔

#

also Burst preview9 is up 👀

wary anchor Apr 1, 2020, 1:46 PM

#

no it doesn't, but I could switch to SingletonEntity for these specific message/event entities or at worst case for loop over the NativeArray after dumping the entity queries to array async

opaque ledge Apr 1, 2020, 1:47 PM

#

well yes, basically ECB is same with any structral changes, except that it happens to in at a later time

wary anchor Apr 1, 2020, 1:47 PM

#

a later time still guaranteed to be in the same frame?

opaque ledge Apr 1, 2020, 1:47 PM

#

if you use EndCommandBuffer, yes

wary anchor Apr 1, 2020, 1:48 PM

#

thanks that's champion

warped trail Apr 1, 2020, 1:48 PM

#

it depends on which sync point you choose

wary anchor Apr 1, 2020, 1:48 PM

#

EndSimulationEntityCommandBufferSystem most likely for this one

opaque ledge Apr 1, 2020, 1:48 PM

#

yep

warped trail Apr 1, 2020, 1:48 PM

#

if your system will run before EndSimulationEntityCommandBufferSystem, then yes it will happen in same frame

wary anchor Apr 1, 2020, 1:49 PM

#

yup, that's grand thanks guys

warped trail Apr 1, 2020, 1:50 PM

#

not concurent version of ecb accepts entityquery

#

protected override JobHandle OnUpdate(JobHandle inputDeps)
{
  var ecb = ecbSystem.CreateCommandBuffer();
  ecb .DestroyEntity(entityQuery)
//Then do stuff so it only happens once
}```

wary anchor Apr 1, 2020, 1:57 PM

#

has now become:


protected override void OnUpdate()
{
  var commandBuffer = ecbBufferSystem.CreateCommandBuffer();
...
Entities
  .ForEach((...)=>
    {
    //stuff
    commandBuffer.DestroyEntity(playerChemUpdateQuery);
    Entity a = commandBuffer.CreateEntity();
    commandBuffer.AddComponent(a, new PlayerResizingEvent());
    })
  .Schedule();
ecbBufferSystem.AddJobHandleForProducer(Dependency);

warped trail Apr 1, 2020, 1:57 PM

#

i think this should be outside of ForEachcs commandBuffer.DestroyEntity(playerChemUpdateQuery);

wary anchor Apr 1, 2020, 1:59 PM

#

not sure I follow how that would go, gimme a sec I'm close to setting the first pass of all systems converted to SystemBase done, then I'll know whether it'll build or not 😄

warped trail Apr 1, 2020, 2:01 PM

#

protected override void OnUpdate()
{
  var commandBuffer = ecbBufferSystem.CreateCommandBuffer();
  commandBuffer.DestroyEntity(playerChemUpdateQuery);
  var commandBufferA =  ecbBufferSystem.CreateCommandBuffer().ToConcurent();
  ...
  Entities
    .ForEach((...)=>
      {
        //stuff
        Entity a = commandBufferA.CreateEntity();
        commandBufferA.AddComponent(a, new PlayerResizingEvent());
      })
    .Schedule();
  ecbBufferSystem.AddJobHandleForProducer(Dependency);
}```

wary anchor Apr 1, 2020, 2:02 PM

#

ahh okay, so it should pick up the dependency info it needs automatically?

scarlet inlet Apr 1, 2020, 2:03 PM

#

Hello! Having fun in not understanding how to use SharedStatic<T>. Any lead?

warped trail Apr 1, 2020, 2:06 PM

#

im wondering wouldn't using native stream be a better idea for events?🤔

opaque ledge Apr 1, 2020, 2:07 PM

#

So its basically a 'field' that you can set/read both from managed code and from bursted jobs @scarlet inlet

#

construction is kinda weird looking, but its basically a copy paste operation

scarlet inlet Apr 1, 2020, 2:10 PM

#

yes I am not sure how to use it, it crashes on me all the time

#

C:\Prgdir\Svelto\Svelto.MiniExamples\Example1-DoofusesMustEat\Iteration3-Jobs\Assets\Svelto\Svelto.ECS\EntityBuilder.cs(171,13): Burst error BC0102: Unexpected internal compiler error while processing function IL_0001: ldflda Svelto.ECS.SharedStatic1<System.UInt32> Svelto.ECS.EntityComponentIDMap::ID`: System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: index

#

@warped trail not sure what you are talking about because I didn't follow, but I use a publish/consumer model for events. It's still polling, in the sense that the system interested in "listening" must poll its queue of published events

#

however I must say that I don't publish random data, I publish a copy of the entity component

#

so it becomes also an historic streaming of the entity component values

low tangle Apr 1, 2020, 2:14 PM

#

entityInQueryIndex is just like the older job index, basically just the index from the for loop going over the entities. the thing about it being played back is it isn't a ref int or a int*. your making a copy of that int and writing it to the ecb's buffer when you call that function on it requiring the index. @wary anchor

wary anchor Apr 1, 2020, 2:20 PM

#

thanks for the explanation @low tangle!

mint iron Apr 1, 2020, 2:21 PM

#

@scarlet inlet ive used it a few times, https://gist.github.com/jeffvella/8ac73ba00552998b66140a886646a234 its an older script, they since have made the normal typeManager native accessible by using SharedStatic, and introduced Unsafe version of the map so i wouldn't have to rip out the safety

Gist

NativeTypeManager.cs

GitHub Gist: instantly share code, notes, and snippets.

scarlet inlet Apr 1, 2020, 2:22 PM

#

thank you! was waiting for your reply 🙂 I just need a static uint

#

what I am doing it's not hard and actually burst would read from a readonly static variable, but this static variable value is set from another not readonly static variable and Burst doesn't like it

#

I understand that it's because c# and burst static values won't coincide, which makes sense

#

///used in burst
static class EntityComponentID<T>
    {
///used in burst
        public static readonly uint ID;
///not used in burst
        static EntityComponentID()
        {
            ID = EntityComponentIDMap.NextID();
        }
    }
///NOT used from burst
    static class EntityComponentIDMap
    {
//the only bit potentially used by burst
        internal static uint NextID()
        {
            return ID.value.Data++;
        }

        static readonly SharedStatic<uint> ID = new SharedStatic<uint>();
    }

#

class SharedStatic<T> where T : struct
    {
        public Unity.Burst.SharedStatic<T> value =
            Unity.Burst.SharedStatic<T>.GetOrCreate<Key>();

        public SharedStatic()
        {
            value.Data = default;
        }

        class Key { }
    }

#

the second bit is random code, still didn't figure it out @mint iron 😄

mint iron Apr 1, 2020, 2:46 PM

#

this is how Unity uses it for TypeManager

    private sealed class TypeManagerKeyContext { }
    private sealed class SharedTypeInfo
    {
        public static readonly SharedStatic<System.IntPtr> Ref = SharedStatic<System.IntPtr>.GetOrCreate<TypeManagerKeyContext, SharedTypeInfo>();
    }
    internal unsafe static TypeInfo* GetTypeInfoPointer()
    {
        return (TypeInfo*)(void*)SharedTypeInfo.Ref.Data;
    }
    public unsafe static TypeInfo GetTypeInfo<T>()
    {
        return GetTypeInfoPointer()[GetTypeIndex<T>() & 0xFFFFFF];
    }

#

lemme see if i can adapt this to your situation

scarlet inlet Apr 1, 2020, 2:54 PM

#

yes I am basically doing the same thing

#

let's see if I can follow that

wet epoch Apr 1, 2020, 2:56 PM

#

what do you need this for?

#

seems like a lot of work for a static uint

scarlet inlet Apr 1, 2020, 2:56 PM

#

talking to me?

wet epoch Apr 1, 2020, 2:56 PM

#

yeah

scarlet inlet Apr 1, 2020, 2:57 PM

#

yeah basically I need to map a type to an ID like it's done in the unity code

#

but these types are not built really at run time, they could be theoretically at compilation time, but since such a thing doesn't exists in c#, they are created in static constructor. Once for each applicaiton run.

#

this means that the ID must be static too, but burst doesn't like ID whose value can change

wet epoch Apr 1, 2020, 2:58 PM

#

what is a 'type' in your context?

scarlet inlet Apr 1, 2020, 2:58 PM

#

something that I pass through a generic parameter

#

EntityComponentID<T> //T

bright sentinel Apr 1, 2020, 2:59 PM

#

Are there any learning resources for netcode other than the docs and sample project? They're pretty sparsely documented :/

wet epoch Apr 1, 2020, 2:59 PM

#

just wondering why structs would need IDs like that 🙂

#

trying to do some weird generic code with burst or something?

scarlet inlet Apr 1, 2020, 3:02 PM

#

hehe yes it's weird if you want to put in that way. However the point is that I need to store some types from burst code, but since burst can't use Type, I need to map them to IDs

#

but what I am doing is definitively not common

#

@mint iron I finally understood the reason of the context btw

coarse turtle Apr 1, 2020, 3:05 PM

#

@bright sentinel https://www.reddit.com/r/GlobalOffensive/comments/6yij1l/the_grand_post_of_csgo_network_code/ I did come across pinning this post a while back - it doesn't exactly teach you - but it explains some of the concepts 🤔

digital kestrel Apr 1, 2020, 3:05 PM

#

how do u edit component system parameters in editor?

mint iron Apr 1, 2020, 3:06 PM

#

whats the reason, im still not sure i get whats going on here.

bright sentinel Apr 1, 2020, 3:07 PM

#

@coarse turtle Hahaha see who made the post 😉

scarlet inlet Apr 1, 2020, 3:07 PM

#

my understanding is to have an unique static object. if it was just <uint> it would be the same static object for all the <uint> SharedStatic. Anyway I am still getting errors: C:\Prgdir\Svelto\Svelto.MiniExamples\Example1-DoofusesMustEat\Iteration3-Jobs\Assets\Svelto\Svelto.ECS\EntityBuilder.cs(171,13): Burst error BC1042: The managed class type Unity.Burst.SharedStatic1<System.UInt32>*is not supported. Loading from a non-readonly static fieldSvelto.ECS.SharedStatic2<uint,Svelto.ECS.EntityComponentIDMap.Context>.value is not supported

wary anchor Apr 1, 2020, 3:08 PM

#

Just wanted to say a big THANK YOU! to the many of you gurus who helped me update my old 0.5 code to 0.8.0 and get rid of some bad practices along the way. I'm back to a working build in a little under 2 half days with your help. You guys are awesome! Have a video update of where I am now 🙂

📎 pOnDe7y4P2.webm

scarlet inlet Apr 1, 2020, 3:08 PM

#

that error is unexpected 😄

opaque ledge Apr 1, 2020, 3:08 PM

#

looks nice 😄

coarse turtle Apr 1, 2020, 3:08 PM

#

nice @wary anchor

bright sentinel Apr 1, 2020, 3:08 PM

#

My problem isn't so much the high-level stuff, more about how to get it done with ECS NetCode

wary anchor Apr 1, 2020, 3:09 PM

#

thanks!

mint iron Apr 1, 2020, 3:09 PM

#

@wary anchor thats stunning, very nice job

wary anchor Apr 1, 2020, 3:09 PM

#

working on the UI now, it's half updated, but boy there';s so much work to do

coarse turtle Apr 1, 2020, 3:09 PM

#

It's the same for me @bright sentinel - going to revisit how my side is done 🤔

#

but im just using the low level transport layer - not necessarily the netcode package on top of it

bright sentinel Apr 1, 2020, 3:10 PM

#

Ah okay

digital kestrel Apr 1, 2020, 3:10 PM

#

lmk if u find good samples @bright sentinel

#

im thinking about peer to peer multiplayer

bright sentinel Apr 1, 2020, 3:11 PM

#

Well I know that netcode doesn't really support that yet

digital kestrel Apr 1, 2020, 3:11 PM

#

where one player acts as a host

bright sentinel Apr 1, 2020, 3:11 PM

#

Because they're focusing on server authoritative stuff

#

Oh

#

Maybe that's possible

#

Ya that should be possible with NetCode

#

But actual p2p isn't

digital kestrel Apr 1, 2020, 3:11 PM

#

most games dont use p2p

#

that's why

coarse turtle Apr 1, 2020, 3:12 PM

#

well technically you can make the host player boot up a server 🤔

digital kestrel Apr 1, 2020, 3:12 PM

#

i guess host is technically a server

bright sentinel Apr 1, 2020, 3:12 PM

#

Yeah exactly. But they do plan on having actual P2P with lockstep etc in the future

#

That was on the roadmap last time

#

But maybe there's something new in 45 minutes 😄

#

https://www.youtube.com/watch?v=w6sn8bJiZ2g

YouTube

Unity

Unity Roadmap 2020: Live Games

Join us on Wednesday, April 1 at 9 am PDT for the second installment of our 2020 roadmap, Unity 2020: Live Games.

We know you'll have a lot of questions about this roadmap, so we're hosting a Q&A on the Unity forum following the session. Product experts from across Unity wil...

▶ Play video

#

Make sure to tune in

#

Seems like it's relevant for us 😄

warped trail Apr 1, 2020, 3:13 PM

#

in the future 😅

mint iron Apr 1, 2020, 3:55 PM

#

are you australian @wary anchor ?

zenith wyvern Apr 1, 2020, 4:10 PM

#

Bummer, I thought this would at least partly be about their networking package, it seems it's only about their analytical tools and microtransaction game tools

bright sentinel Apr 1, 2020, 4:18 PM

#

@zenith wyvern Probably coming up

#

Live Games is a lot of stuff

warped trail Apr 1, 2020, 4:20 PM

#

😅

fallow mason Apr 1, 2020, 4:20 PM

#

did roadmap vid just end?

north bay Apr 1, 2020, 4:20 PM

#

Yea lmao

warped trail Apr 1, 2020, 4:20 PM

#

yeah

fallow mason Apr 1, 2020, 4:20 PM

#

i just started watching 😆

bright sentinel Apr 1, 2020, 4:21 PM

#

oh lmao

#

wtf

amber flicker Apr 1, 2020, 4:25 PM

#

any highlights for the lazy of us?

fallow mason Apr 1, 2020, 4:26 PM

#

well, it is April Fools day, so it could all be a joke

zenith wyvern Apr 1, 2020, 4:26 PM

#

any highlights for the lazy of us?
@amber flicker
There was nothing dots related

#

Pretty disappointed with what they chose to come up with after GDC got cancelled. As far as the dots stuff it seems like a fraction of a fraction of the information we would have gotten from the actual gdc talks.

bright sentinel Apr 1, 2020, 4:30 PM

#

I don't think this was supposed to be the GDC replacement though

fallow mason Apr 1, 2020, 4:30 PM

#

I was just thinking that @zenith wyvern. No way they would have gotten up on stage and only showed this.

opaque ledge Apr 1, 2020, 4:30 PM

#

anyone tried out new platforms package btw ? last time i tried it was giving full of errors, or should i just stay at 0.2.1

zenith wyvern Apr 1, 2020, 4:31 PM

#

If these roadmaps were not intended to be the replacement for what we would have seen at GDC then I will be happy to be wrong

safe lintel Apr 1, 2020, 4:32 PM

#

seems like they are holding out on us 😦

digital kestrel Apr 1, 2020, 4:32 PM

#

anyone else disappointed 😅

vagrant surge Apr 1, 2020, 4:40 PM

#

unreal is even more of a dissapointm,ent

fallow mason Apr 1, 2020, 4:40 PM

#

but holding out hope that there's more talks coming

vagrant surge Apr 1, 2020, 4:40 PM

#

they cancelled everything

#

and there were some seriously hype talks and announcements

fallow mason Apr 1, 2020, 4:41 PM

#

what we really need is a roadmap for the planned talks lol

vagrant surge Apr 1, 2020, 4:41 PM

#

for example, very likely to show their new ecs stuff

safe lintel Apr 1, 2020, 4:53 PM

#

is it possible to do chunk iteration on managed objects?

#

it was possible with the old componentsystem a while ago(then they changed it so you couldnt)

opaque ledge Apr 1, 2020, 4:54 PM

#

managed objects doesnt live in chunk, but you can do ForEach using component/buffer classes

#

old component system run on main thread

safe lintel Apr 1, 2020, 4:56 PM

#

theres a nasty bug currently with foreach https://issuetracker.unity3d.com/issues/ecs-internal-native-array-is-deallocated-when-componentdatafromentity-is-captured-into-2-lambda-jobs
was wondering if i could just remake it with chunk like the old days to work around it

Unity IssueTracker - [ECS] Internal native array is deallocated whe...

How to reproduce: 1. Open the attached project ("case_1207875-NativeArray.zip") 2. Open Test Runner 3. Run the 'CdfeCaptureSharing' ...

bright sentinel Apr 1, 2020, 4:59 PM

#

@safe lintel Is this also happening in 0.8.0?

safe lintel Apr 1, 2020, 4:59 PM

#

it is for me

#

and it seems to be just one job(unless it means two jobs from two unrelated systems?)

mint iron Apr 1, 2020, 5:02 PM

#

wonder if this still happens using the SystemBase GetComponent, which seems to be the replacement for passing in a CDFE

safe lintel Apr 1, 2020, 5:03 PM

#

hm will try that

#

anyway for the record, the dealloc error doesnt happen in a build, only in editor, sometimes..(so, annoying for testing)

#

ok nice i think that fixed it!

#

thanks @mint iron

scarlet inlet Apr 1, 2020, 5:11 PM

#

I wanted just to share with you the pain that I wasn't able to crack SharedStatic<T> yet it seems to me that hasn't been designed to be used inside burst which confuses me a lot

opaque ledge Apr 1, 2020, 5:12 PM

#

its literally designed to be used inside burst

#

😄

bright sentinel Apr 1, 2020, 5:12 PM

#

@mint iron Don't you think it just fetches CDFE behind the scenes?

scarlet inlet Apr 1, 2020, 5:13 PM

#

@opaque ledge I know right, but it literally says: Burst error BC1042: The managed class type Unity.Burst.SharedStatic1<System.UInt32>*` is not supported

#

waaaat

opaque ledge Apr 1, 2020, 5:15 PM

#

🤔

scarlet inlet Apr 1, 2020, 5:16 PM

#

I can't also imagine what alternative solution I could use, beside, maybe, a global native dictionary

opaque ledge Apr 1, 2020, 5:16 PM

#

should be something like

public abstract class Shared_UInt{
private class UINTKey{}
public static readonly SharedStatic<uint> uint = SharedStatic<uint>.GetOrCreate<Shared_UInt, UINTKEY>();
}

scarlet inlet Apr 1, 2020, 5:16 PM

#

yes

#

I use this: not dissimilar:

class SharedStatic<T, W> where T : unmanaged
    {
        public static Unity.Burst.SharedStatic<T> value =
            Unity.Burst.SharedStatic<T>.GetOrCreate<SharedStatic<T, W>>();

        static SharedStatic()
        {
            value.Data = default;
        }
    }

opaque ledge Apr 1, 2020, 5:17 PM

#

and use Shared_UInt.uint.Data

#

to access

scarlet inlet Apr 1, 2020, 5:17 PM

#

wait radonly?

opaque ledge Apr 1, 2020, 5:17 PM

#

yeah

scarlet inlet Apr 1, 2020, 5:17 PM

#

let me check

#

hmm k

#

didn't crash but I have another bug

#

brb 😄

opaque ledge Apr 1, 2020, 5:19 PM

#

just copy from the burst manual really, thats what i do, its also recommended that you should give it's first value from managed side otherwise behaviour is undefined

scarlet inlet Apr 1, 2020, 5:27 PM

#

thanks for the tip, it's not clear what calls it first. It should definitively be the managed code, but still it doesn't work with burst like if the values are screwed

opaque ledge Apr 1, 2020, 5:28 PM

#

perhaps its because you are doing it in a generic way ?

#

just do non-generic version and see how it goes

scarlet inlet Apr 1, 2020, 5:29 PM

#

hmm that's the only thing I didn't test so yeah I'll test it

mint iron Apr 1, 2020, 5:30 PM

#

i dunno if this helps you but, what i tried **didnt **work https://gist.githubusercontent.com/jeffvella/5142541e61af0cffe4b841f2360956bd/raw/249177b763ae21b4e95c0e26752936661135dd2d/gistfile1.txt

scarlet inlet Apr 1, 2020, 5:31 PM

#

thank 1M to test it!

mint iron Apr 1, 2020, 5:31 PM

#

that code didnt work thats why i never pasted it 😛

#

the numbers show up in the test all weird like 6789, 15,16,17

#

its like its creating multiple instances or something i dont get it

scarlet inlet Apr 1, 2020, 5:32 PM

#

yes I am experiencing something similar

#

the numbers are not right

mint iron Apr 1, 2020, 5:32 PM

#

do you need control of the ID or could you just use like the runtime hash?

scarlet inlet Apr 1, 2020, 5:32 PM

#

but only if burst is on, otherwise it works fine

#

I need to be consecutive numbers

mint iron Apr 1, 2020, 5:33 PM

#

ahhh

scarlet inlet Apr 1, 2020, 5:33 PM

#

well hash would be OK actually, but only if with no collision

#

well actually I could also not having issue with that 😄

#

ok what's your idea?

mint iron Apr 1, 2020, 5:34 PM

#

BurstRuntime.GetHashCode32(typeInfo.Type) / BurstRuntime.GetHashCode32<T>()

safe lintel Apr 1, 2020, 5:34 PM

#

btw @opaque ledge whats the prefab issue that you had(from the discussion earlier)? to be able to create a prefab without actually referencing it in scene from another entity or something?

scarlet inlet Apr 1, 2020, 5:35 PM

#

right didn't know those testing now

opaque ledge Apr 1, 2020, 5:36 PM

#

i couldnt make a entity prefab without runtime conversation basically @safe lintel i had to create a MB and in it's Start function i converted gameobjects to entities thru conversation utility and stashed them in shared static

scarlet inlet Apr 1, 2020, 5:37 PM

#

yes @mint iron it worked! bill me now 🙂

mint iron Apr 1, 2020, 5:37 PM

#

😉

scarlet inlet Apr 1, 2020, 5:38 PM

#

hehe you also made me notice another error with this idea. Thanks for the GetHashCode I didn't know it existed

#

OK I bugger off now ciao!

coarse turtle Apr 1, 2020, 6:00 PM

#

@opaque ledge what about IDeclareReferencedPrefabs?

opaque ledge Apr 1, 2020, 6:01 PM

#

Entity is not valid when i do that

#

iirc

coarse turtle Apr 1, 2020, 6:01 PM

#

in the end you would get the entities you need so you can grab that and instantiate it 🤔

#

Ah 🤔

eager jungle Apr 1, 2020, 6:34 PM

#

hey, can someone explain me when to use SystemBase over ComponentSystem? and is JobComponentSystem still a thing?

safe lintel Apr 1, 2020, 6:35 PM

#

always use systembase, both jobcomponentsystem and componentsystem will be made obsolete some time in the future

eager jungle Apr 1, 2020, 6:36 PM

#

ok cool, i was looking at using PostUpdateCommands, but that doesn't seem to still be there in systembase

#

what's the good way to do it? (im trying to instanciate a prefab from a system)

safe lintel Apr 1, 2020, 6:37 PM

#

postupdatecommands is just a builtin helper which uses a command buffer internally afaik, you just need to create the command buffer yourself now, pretty sure its shown somewhere in the entities docs

eager jungle Apr 1, 2020, 6:37 PM

#

ok , wasn't sure about that. No helper equivalent function you know about?

safe lintel Apr 1, 2020, 6:38 PM

#

not as far as I know

warped trail Apr 1, 2020, 6:39 PM

#

you can use something like thatcs var postUpdateCommands = new EntityCommandBuffer(Allocator.TempJob); //Do your work postUpdateCommands.Playback(EntityManager); postUpdateCommands.Dispose()

#

basically the same thing

eager jungle Apr 1, 2020, 6:40 PM

#

shall i create it once in the create method of the system?

warped trail Apr 1, 2020, 6:40 PM

#

i don't know🤔

eager jungle Apr 1, 2020, 6:42 PM

#

trying that right now, thanks 😉

warped trail Apr 1, 2020, 6:43 PM

#

but you have to use concurrent one, if you doing your work in jobs🤔

#

oh, b4 is out😅

dull copper Apr 1, 2020, 6:47 PM

#

https://github.com/UnityTechnologies/MinecraftECS

GitHub

UnityTechnologies/MinecraftECS

This is a Workshop Project that made for a User group talk in Taiwan, It's about how to create a Minecraft like environment with huge number of blocks using ECS - UnityTechnologies/MinecraftECS

safe lintel Apr 1, 2020, 6:50 PM

#

Entities Version: 0.0.12-preview21 🧓

dull copper Apr 1, 2020, 6:50 PM

#

I was about to say that this is ancient

#

last commit from 2018 😄

warped trail Apr 1, 2020, 6:50 PM

#

[Inject]😏

dull copper Apr 1, 2020, 6:50 PM

#

lol

#

I didn't realize it was that ancient 😄

#

repo was just updated 18days ago for something

eager jungle Apr 1, 2020, 6:51 PM

#

is there a way to instantiate a prefab from a system, and keep the gameobject counterpart, like in Convert To Entity: Convert and Inject Game Object ?
and second question: how can i change the name of an entity instantiated using a commandBuffer?

coarse turtle Apr 1, 2020, 6:53 PM

#

Hmm idk about the first one - but the second there is no way currently

opaque ledge Apr 1, 2020, 6:53 PM

#

Has anyone encountered a problem with loading a scene ? it seems like.. convert to entity scripts doesnt work on new loaded scene or doesnt register to default world properly

coarse turtle Apr 1, 2020, 6:53 PM

#

you need the entitymanager to be able to set the name, otherwise you can add a component which has the name of the entity 🤔

#

@opaque ledge I had that problem in entities 0.7 👀

#

but I upgraded to 0.8 and it worked again :/

opaque ledge Apr 1, 2020, 6:54 PM

#

:/

warped trail Apr 1, 2020, 6:55 PM

#

just store every prefab in subscene😅

safe lintel Apr 1, 2020, 6:55 PM

#

man i havent even touched scene loading/changes 😄

eager jungle Apr 1, 2020, 6:55 PM

#

thanks guys

opaque ledge Apr 1, 2020, 6:55 PM

#

i have a camera in 2nd scene, i need to be able to activate it once i am in that scene, but that camera isnt properly registered to defaul world

#

it all works fine if i add the scene to editor, but not if from code, which i need to do

mint iron Apr 1, 2020, 6:56 PM

#

this seems a little odd, its throwing exception because its invalidating the array on SetComponent, even though its a temp allocation used only here, inside structural changes block.

Entities.ForEach((ref SpawnActorEvent e) =>
{
    if (_prefabs.TryGetFirstValue((int)e.Type, out var first, out var it))
    {
        var entities = EntityManager.Instantiate(first.Entity, e.Amount, Allocator.Temp);

        for (int i = 0; i < entities.Length; i++)
        {
            SetComponent(entities[i], new Translation 
            {
                Value = RandomCirclePosition(center, radius)
            });
        }
    }

}).WithStructuralChanges().Run();

opaque ledge Apr 1, 2020, 6:57 PM

#

This is the first time i am maknig a build, and... there are differences between editor and actual build 😄

#

it only has problem with inject mode i think, other entities arent also showing in debugger but at least their system works properly

coarse turtle Apr 1, 2020, 7:01 PM

#

oof...I think I should take a look at mine since I'm using convert and inject 😬

opaque ledge Apr 1, 2020, 7:03 PM

#

i had to get UI related stuff out of my project because it wasnt building because of TMP references in managed components, now this.. 😒

mint iron Apr 1, 2020, 7:04 PM

#

just store every prefab in subscene:sweat_smile: yeah it works but im curious about the overheads because for every entity i instantiate its making 3 entities, with all sorts of scene related Ids and trackers and mumbo-jumbo.

stiff skiff Apr 1, 2020, 7:06 PM

#

An ECS Hybrid question. I can see that its possible to Spawn a GameObject which then gets a linked ECS entity created and synced. But can is there a way to provide an already existing entity to link it too?

dull copper Apr 1, 2020, 7:35 PM

#

https://blogs.unity3d.com/2020/04/01/were-bringing-unity-to-you-unite-now-starts-april-14/ but nothing on DOTS

#

that being said, this is just first one

#

I'm sure they'll cover DOTS on some upcoming ones

#

"a physical Unite event is not in the cards this year."

fallow mason Apr 1, 2020, 7:53 PM

#

Meet the Devs: Input System

#

excited for that one. hope they go in depth.

#

I'd post about it in the Input System channel if there were one 😢

mint iron Apr 1, 2020, 7:59 PM

#

https://forum.unity.com/forums/new-input-system.103/ ?

Unity Forum

New Input System

For feedback on the experimental new input system.

#

oh you mean here, derp!

raven grail Apr 1, 2020, 8:11 PM

#

Hi, is there any way to raycast into a DOTS plane? The old Plane had a Raycast() method for that but I can't find anything analogous that can be used from a Job

fallow mason Apr 1, 2020, 8:16 PM

#

https://github.com/Unity-Technologies/EntityComponentSystemSamples/blob/09fd52fb1da707f8462f2130c0f05d8fd6e1fa19/UnityPhysicsSamples/Assets/Demos/3. Query/Scripts/QueryTester.cs

GitHub

Unity-Technologies/EntityComponentSystemSamples

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

raven grail Apr 1, 2020, 8:21 PM

#

I don't see anything plane-related

#

Just regular physics raycasts, which aren't helpful in my case

#

Needs to be specifically into a plane

fallow mason Apr 1, 2020, 8:22 PM

#

plane-related? You cast against a collider. It doesn't matter what shape it is.

raven grail Apr 1, 2020, 8:22 PM

#

Plane doesn't have a collider

fallow mason Apr 1, 2020, 8:23 PM

#

it should if you're wanting to get a hit when you raycast it

raven grail Apr 1, 2020, 8:23 PM

#

OOP didn't need it

#

See https://docs.unity3d.com/ScriptReference/Plane.Raycast.html

#

I'm asking if there's something equivalent for Physics.Plane

safe lintel Apr 1, 2020, 8:25 PM

#

if Im understanding that page correctly, no theres no builtin equivalent that ive seen. you will just have to setup your own plane and raycast against it yourself which wouldnt be too hard

fallow mason Apr 1, 2020, 8:25 PM

#

I see

#

Check out this: https://github.com/Unity-Technologies/EntityComponentSystemSamples/blob/5c71cb85f42ebb8d126e492a46cdb178586b08e9/UnityPhysicsSamples/Assets/Common/Scripts/RayTracer/RayTracerSystem.cs

GitHub

Unity-Technologies/EntityComponentSystemSamples

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

#

They do a sphere cast using a sphere collider that's stored in a blobassetreference

#

just do a similar thing with a plane instead

#

not sure there's a 1:1 equivalent of plane.raycast in DOTS yet

raven grail Apr 1, 2020, 8:27 PM

#

Might have to do something like that

#

Feels like 60% of working with ECS is just workarounds, hacks and reimplementing missing features

#

On that note, I don't suppose there is any other built-in way of obtaining the distance between a point and a plane?

#

I've seen some methods in Plane but there's no documentation and the output is not what I'd expect

viral sonnet Apr 1, 2020, 9:00 PM

#

Is anyone running Unity 2020.1.0b3 with hybrid renderer?

bright sentinel Apr 1, 2020, 9:36 PM

#

https://blogs.unity3d.com/2020/04/01/were-bringing-unity-to-you-unite-now-starts-april-14/ Here's your Unity GDC 😄

Unity Technologies Blog

We’re bringing Unity to you: Unite Now starts April 14 - Unity Tech...

Introducing Unite Now, a digital programming series of talks, demos, Q&As and stories – all available on your favorite device. For you. For all.
Live ...

safe lintel Apr 1, 2020, 10:26 PM

#

just give me the slides for what was supposed to be presented at gdc

#

and id be happy

mint iron Apr 1, 2020, 10:26 PM

#

Anyone know how i can make a subscene GameObject into a prefab in my main world, without using IDeclareReferencedPrefabs? I thought it was working by just adding the Prefab component but there's something else going on becuase they get filtered out by the Camera.

warped trail Apr 1, 2020, 10:32 PM

#

this is how prefab component works🤔

mint iron Apr 1, 2020, 10:34 PM

#

the prefab instantiates fine, but the new objects are not rendered

warped trail Apr 1, 2020, 10:35 PM

#

new objects?

#

adding prefab component to entity makes it invisible to any system, unless they explicitly query it

#

and this instantiated entities have all components?🤔

mint iron Apr 1, 2020, 10:44 PM

#

yep they have components

#

too many components, looks like its all the sub-scene live link stuff thats probably breaking it, wondered if anyone has already jumped through these hoops, and i might be able to save myself some pain

#

mmm okay nothing in any subscene is rendering, so this all might be moot.

warped trail Apr 1, 2020, 10:55 PM

#

are you using things like this [ConverterVersion("joe", 1)] 😅

mint iron Apr 1, 2020, 10:56 PM

#

no, but i think i just figured it out, ... didnt have hybid renderer package.. yep that was it

#

facepalm

warped trail Apr 1, 2020, 10:56 PM

#

😑

coarse turtle Apr 2, 2020, 12:27 AM

#

there's a prefab component?

#

lol I didn't know that 👀

fallow zealot Apr 2, 2020, 7:04 AM

#

not sure if anyone is interested but if you are just starting DOTS like me, maybe you will be interested for this new tutorial on Udemy by Penny de Byl who is known in Unity community, a great teacher i am sure it will be a great ressource for new learner in DOTS.
https://www.udemy.com/course/unitydots/

Udemy

Learn Unity's Entity Component System to Optimise Your Games

Update your Unity programming skills to take advantage of the new Data Orientated Technology Stack and Burst Compiler

verbal pewter Apr 2, 2020, 10:02 AM

#

Is an error thrown when you try to remove a component that doesn't exist on an entity, or does it just ignore the call? Wondering if I need to use HasComponent before removing components.

#

I guess I'm wondering about the reverse too. If I'm adding a tag component that doesn't have any data in it, do I need to call HasComponent first or can I just add it?

vagrant surge Apr 2, 2020, 10:24 AM

#

having a look at that udemy tutorial

#

its actually damn good

#

unlike all ecs tutorials, the "move 20.000 objects" is only the intro to the concepts, it then continues to more complicated stuff

#

to show the ecs stuff on the "move 20k objects", it does a progression

#

spawn script + 20k monobehavior with position delta on update -> spawn script also has update loop that moves all objects -> spawn script uses IJobParallelForTransform to parallel transform the objects -> ECS

opaque ledge Apr 2, 2020, 10:37 AM

#

@verbal pewter afaik, no it doesnt give you an error if component doesnt exist

#

at least for ECB, not sure for entity manager directly

opaque ledge Apr 2, 2020, 11:08 AM

#

This comments for Visual scripting are pretty rough, i hope Unity will listen those issues and i hope they wont be discouraged or smth

verbal pewter Apr 2, 2020, 11:17 AM

#

@opaque ledge Okay thanks!

dull copper Apr 2, 2020, 11:29 AM

#

@fallow zealot issue with course like that is that it will be - if is not already - totally outdated in months

#

DOTS just moves so fast you can't maintain a bigger video tutorial course without the practises getting outdated almost immediately

warped trail Apr 2, 2020, 11:30 AM

#

@opaque ledge i don't think they really care about this type of feedback😅

dull copper Apr 2, 2020, 11:32 AM

#

also course like that should totally tell people which DOTS packages it's using so people would have even some idea on what to expect

#

it being published 3/2020 doesn't mean it even uses SystemBase for entities

opaque ledge Apr 2, 2020, 11:32 AM

#

well criticism is also a feedback 🙂

warped trail Apr 2, 2020, 11:37 AM

#

if they had cared about such things on forum, we would got dark theme for free looong time ago😂

fallow mason Apr 2, 2020, 11:39 AM

#

I think the criticism buried in a manifesto of ad hominem and condescension has to be the most annoying

vagrant surge Apr 2, 2020, 11:39 AM

#

@dull copper im watching it and it seems to be very good for now

#

this is what it uses

#

📎 unknown.png

#

for now, at early-ish stages

warped trail Apr 2, 2020, 11:40 AM

#

this is already outdated 😅

dull copper Apr 2, 2020, 11:40 AM

#

yes, that's "outdated" already

#

SystemBase is what we should use now

#

that being said, a lot of things on that course are probably still very relevant

mint iron Apr 2, 2020, 11:41 AM

#

whats the point of WithName?

vagrant surge Apr 2, 2020, 11:41 AM

#

to have the for-each be named

#

to then in the debugger be able to find it easily

#

for benching and similar

mint iron Apr 2, 2020, 11:41 AM

#

ahhh okay, thanks

#

they really should put more intellisense comments in

vagrant surge Apr 2, 2020, 11:53 AM

#

damn people are pissed with the new visual script @dull copper

#

the change from vertical layout to blueprint-clone is such a huge downgrade

mint iron Apr 2, 2020, 11:53 AM

#

where on the forums?

vagrant surge Apr 2, 2020, 11:53 AM

#

https://forum.unity.com/threads/dots-visual-scripting-experimental-drop-8.857707/

Unity Forum

DOTS Visual Scripting Experimental Drop 8

Hi everyone,

I hope that in these difficult times, that you are safe and taking care of yourselves and loved ones.

We are making the best out of the...

warped trail Apr 2, 2020, 11:53 AM

#

if only layout was a problem 😕

vagrant surge Apr 2, 2020, 11:54 AM

#

it definitely is a massive fail to go back into oop-ish blueprintclone vs

#

the fun part of visual script for ecs systems is that most ECS systems tend to be very small, so it stays super readable before going into spaguetty

#

vertical layout also gives a lot of structure, with "execution" being vertical, while math is horizontal

#

for example, look at the systems of TinyRacer

#

most of them are some basic math and thats it. That sort of thing maps real nicely to visual script ecs, as it acts as "rules"

dull copper Apr 2, 2020, 11:58 AM

#

@vagrant surge I prefer the horizontal myself

#

but I can understand some of the reasons for what people are upset

vagrant surge Apr 2, 2020, 11:59 AM

#

i kinda liked how the vertical one was going, as it separates the "math" from the "execution" very cleanly

dull copper Apr 2, 2020, 12:00 PM

#

but yeah like mentioned earlier here, it's pretty hard to judge without trying it oneself

#

people tend to hate everything that's different than the previous thing

#

unless the new thing is all around amazing that is (which never happens)

warped trail Apr 2, 2020, 12:01 PM

#

just try it yourself, you will see why people complaining 😅

dull copper Apr 2, 2020, 12:01 PM

#

IMO none of the earlier versions I tried were even remotely usable even

vagrant surge Apr 2, 2020, 12:01 PM

#

new thing is basically BP

dull copper Apr 2, 2020, 12:01 PM

#

so I don't think I'd like the new one either

#

yes

vagrant surge Apr 2, 2020, 12:01 PM

#

prettier nodes tho

fallow mason Apr 2, 2020, 12:01 PM

#

Gotta say, I'm looking forward to the Unite Now Visual Scripting talk:

O.O.P.S: We Did It Again
You ever data driven so hard you end up object-oriented?

mint iron Apr 2, 2020, 12:03 PM

#

seems like they're not clear on who they're designing it for, is it for developers or artists/designers/ less codering people? because if its not for developers, you can't think about it like a developer.

vagrant surge Apr 2, 2020, 12:03 PM

#

visual script is always a selling point for artists/designers/noobs

#

programmers dont give a single fk about VS in general

warped trail Apr 2, 2020, 12:03 PM

#

this is for actual usecases from real world clients/users😏

dull copper Apr 2, 2020, 12:04 PM

#

design changes aside, these two are biggest red flags for me:

* In order to iterate at a better pace we came to the conclusion that we needed to put aside codegen at least temporarily. We are not sure yet if we will bring it back as originally implemented since we have other very performant options that we would like to evaluate first.
* Also temporarily ignoring performance optimization and focusing on the feature set.

#

if history has taught us anything, temporary solutions like these can turn into permanent ones

#

getting clean c# codegen was one of the biggest things that set this apart from competition IMO

#

(unless, they mean some other codegen here)

vagrant surge Apr 2, 2020, 12:06 PM

#

indeed

#

the codegen was a MASSIVE selling point

#

because now you can put it on source control

#

and diff it

#

even if the codegen is not really that stable, having a semi-readable codegen means you can diff it on your repo

#

this is the reason 1 why blueprints suck for big projects on unreal, that they are undiffable binary files

dull copper Apr 2, 2020, 12:07 PM

#

well, I dunno if it's that usable in that way unless it can reverse that to graph form again

#

how I understood that it only let you generate c# alternative for the thing(?)

vagrant surge Apr 2, 2020, 12:07 PM

#

doesnt need to be reversible

#

if the codegen is "stable", you can use it for the diffs

#

kinda like if it was a text representation of the graph

dull copper Apr 2, 2020, 12:08 PM

#

I don't really see how the original graph programmer could maintain it if c# feels alien 😄

vagrant surge Apr 2, 2020, 12:08 PM

#

the ones who are merging stuff are the programmers, not the designers/artists

#

and for those, being able to diff the graphs on the source editor would be huge

#

just to know what changed

mint iron Apr 2, 2020, 12:11 PM

#

you and your actual use cases

fallow mason Apr 2, 2020, 12:12 PM

#

no, now hold on a moment. how do we know he's real world 🤔

vagrant surge Apr 2, 2020, 12:12 PM

#

just commenting from working on an AAA ue4 project, where the binary-ness of the BPs is such a massive headache....

#

we would definitely use VS a lot more if it was diffable

mint iron Apr 2, 2020, 12:13 PM

#

for me when i see those massive graphs with 90% of it nodes just doing math on numbers and 200 lines connecting i just glaze over, it seems absolutely terrible for that sort of thing. The nodes need to actually group and simplify things or it just makes it much worse than writing code.

vagrant surge Apr 2, 2020, 12:13 PM

#

it allways is much worse than code, with an exception

#

timer based stuff and event based stuff is much better on VS

fallow mason Apr 2, 2020, 12:13 PM

#

well, can't you use those placemat things? or is that not what they're for?

vagrant surge Apr 2, 2020, 12:13 PM

#

because on VS you can have OnEvent -> PlayAnimation -> Wait(1second)-> Explosion

fallow mason Apr 2, 2020, 12:14 PM

#

are you talking about merging into a function node?

mint iron Apr 2, 2020, 12:14 PM

#

thats what i was thinking, like in blueprints, the stuff around pawns and spawning actors, events and the UI side are quite nice.

vagrant surge Apr 2, 2020, 12:15 PM

#

on ue4, i almost allways put events on the BP level

#

and then they just call cpp functions

#

specially if its level based stuff

mint iron Apr 2, 2020, 12:16 PM

#

at that point it becomes a useful visual by itself to document the flow of behavior.

pliant pike Apr 2, 2020, 12:24 PM

#

looking at the feedback for the VS it does seem like they have some good well articulated points

#

hopefully they take some of it on board, I like ECS for its focus on pure data

vagrant surge Apr 2, 2020, 12:40 PM

#

btw, a VS that can do both well (maybe 2 modes? ) would be huge

#

being able to express ECS systems (simulation rules), and event based stuff

#

which is where the ECS fails hard

pliant pike Apr 2, 2020, 12:47 PM

#

I don't feel like it fails with event based stuff how so 🤔

vagrant surge Apr 2, 2020, 12:48 PM

#

due to the focus on systems instead of objects, ECS generally struggles with events

#

you need to do actual events, like putting them in a queue, instead of just calling a virtual function or a delegate

pliant pike Apr 2, 2020, 12:50 PM

#

I still have to mess around with event's but just figured you create entity's for them, that's what I've been doing for my simple stuff so far

vagrant surge Apr 2, 2020, 12:55 PM

#

thats one way of doing it, for complicated events

#

sadly it forces sync points on the multithreading

#

its a really nice pattern for complex stuff, as you can process that event on multiple systems. You can do really fun things there

pliant pike Apr 2, 2020, 12:56 PM

#

I'm not sure how you would entirely avoid sync points but surely that is still faster than monobehaviour

vagrant surge Apr 2, 2020, 12:56 PM

#

pretty sure a simple virtual call is faster than having to create entity and process it

pliant pike Apr 2, 2020, 12:59 PM

#

yeah I guess that would be true 🤔

vagrant surge Apr 2, 2020, 12:59 PM

#

its more about the general "flow" of the event

fallow mason Apr 2, 2020, 12:59 PM

#

yes code monkey did a video on events and showed two ways, nativequeue and entity. NativeQueue was going to be much more complicated, but I bet it would be way more performant since you're not having to chunk an entity

vagrant surge Apr 2, 2020, 12:59 PM

#

on just a function call, you can inmediately go to reference and the likes

fallow mason Apr 2, 2020, 1:00 PM

#

and then immediately delete it

vagrant surge Apr 2, 2020, 1:00 PM

#

on queue or entities, you can do super fancy stuff (multithreading/system processing), but its slightly harder to follow the flow

#

oh yeah queue is much faster

#

no sync point to begin with

#

im a really big fan of event entities, ive used them in actual commercial projects (but not with unity ecs XD)

#

being able to have systems process the event and do stuff is amazing

pliant pike Apr 2, 2020, 1:02 PM

#

I'll have to watch that vid then, thanks

vagrant surge Apr 2, 2020, 1:02 PM

#

obvious example is for damage in a RPG. Your player hits an enemy, and has a flaming sword

#

so you create a entity with "DamageEvent(source=player, target =goblin), ElementalDamage(Fire)"

#

then you have a system that checks DamageEvent + ElementalDamage, and if target has elemental resistance, you lower damage

sour ravine Apr 2, 2020, 1:03 PM

#

power pattern ^

vagrant surge Apr 2, 2020, 1:03 PM

#

then you have another system that applies target armor

sour ravine Apr 2, 2020, 1:03 PM

#

also good fit for animation

vagrant surge Apr 2, 2020, 1:03 PM

#

then you have another system that spawns blood particles

#

and then you have another system that actually applies the damage and deletes the event

pliant pike Apr 2, 2020, 1:04 PM

#

or you need to get the length along a spline, so you create the length component and then system finds it and calculates it for you, that's what I've used it for, it works great

vagrant surge Apr 2, 2020, 1:04 PM

#

if you decide to have an enemy that can reflect damage, then you create a system that checks if target has reflect damage component, and spawn another damage event

#

not the fastest pattern... (lots of checks around or adding/remove components), but its power is insane

#

this sort of logic tends to become a huge mess very quickly in a more normal oop architecture

pliant pike Apr 2, 2020, 1:06 PM

#

yeah I'll probably continue to use it until I come up with performance problems

vagrant surge Apr 2, 2020, 1:06 PM

#

if its done for punctual events, there is no issue

pliant pike Apr 2, 2020, 1:07 PM

#

I'm wondering how I would delay or queue events with it that's probably more difficult, 🤔

vagrant surge Apr 2, 2020, 1:07 PM

#

by copying that event entity into a shadow world (to remove it from simulations)

#

and then restoring it at some point

#

alternatively, adding a "disabled" component to that event

fallow mason Apr 2, 2020, 1:08 PM

#

yeah, I think I've seen that pattern on an episode of yugioh or something

vagrant surge Apr 2, 2020, 1:08 PM

#

sending stuff to the shadow realm is a power pattern in ECS

worldly pulsar Apr 2, 2020, 1:09 PM

#

What I did is put a DelayedEvent(activationTime) on it, and than a system checks that and replaces with Event() where appropriate

pliant pike Apr 2, 2020, 1:09 PM

#

that's cool

worldly pulsar Apr 2, 2020, 1:09 PM

#

all the event handlers query for Event()

mint iron Apr 2, 2020, 1:10 PM

#

alternatively, adding a "disabled" component to that event thats what i ended up doing in my event system, because destroying entities is a very slow operation. If you can change the archetype or transfer a batch between archetypes its much faster.

warped trail Apr 2, 2020, 1:10 PM

#

writegroups can help with this type of things🤔

pliant pike Apr 2, 2020, 1:10 PM

#

there's also the structural components I guess, I mean the Isystemstatecomponents

worldly pulsar Apr 2, 2020, 1:12 PM

#

What I had problems with is avoiding one frame delays with the normal auto-created systems (damage event spawned -> all the preprocessing, apply armor, elemental dmg modifiers etc -> damage handler sees the target has reflect on it, spawns another damage event -> no good way to apply armor to the newly spawned event without running the whole chain again

#

ended up actually running the systems manually until there are no more damage events left

fallow mason Apr 2, 2020, 1:14 PM

#

@pliant pike here is the video I mentioned: https://www.youtube.com/watch?v=fkJ-7pqnRGo&feature=emb_title

YouTube

Code Monkey

How to handle Events in Unity DOTS! (C# Events from ECS)

✅ Get the Project files and Utilities at https://unitycodemonkey.com/video.php?v=fkJ-7pqnRGo
Let's learn 2 ways we can handle Events in Unity DOTS! The final class is included in the Project Files.

Unity DOTS / ECS Tutorials
https://www.youtube.com/playlist?list=PLzDRvYVwl53s...

▶ Play video

sour ravine Apr 2, 2020, 1:14 PM

#

something to consider with Unity is the use of query-based entity destruction

vagrant surge Apr 2, 2020, 1:14 PM

#

@worldly pulsar thats common

#

ive seen project have a "chain" of event-systems

#

and they loop until there are no more events

warped trail Apr 2, 2020, 1:17 PM

#

i guess you can chain systemgroups with UpdateCallback🤔

mint iron Apr 2, 2020, 1:18 PM

#

query based destroy is still not that fast, in fact from my testing for small numbers of entities its faster to just do them one by one.

sour ravine Apr 2, 2020, 1:23 PM

#

curious to know more there, but always did the punctual event approach so had larger numbers of things

mint iron Apr 2, 2020, 1:24 PM

#

one big issue right now is that only some of the EntityManager methods go through burst routes and this might be the cause here. For example, CreateChunk() is considerably slower than it should be because it is not wired to a burst function like CreateEntity is in StructuralChanges.

amber flicker Apr 2, 2020, 1:25 PM

#

just a note that query based archetype change still v fast (e.g. adding disabled tag to an event) - but that a batch method is slower than doing them individually at small numbers for some things obviously sucks

mint iron Apr 2, 2020, 1:27 PM

#

luckily its pretty easy to test, create a bunch of entities and put a stopwatch around these various delete options. for me it seemed that around 1000 entities the query took over as faster. But having said that its probably linked to how many different archetypes are used with the query components.

amber flicker Apr 2, 2020, 1:27 PM

#

did you compare against ecb out of curiosity?

worldly pulsar Apr 2, 2020, 1:28 PM

#

is that 1k entities in a single archetype, or over a lot of different archetypes?

fallow mason Apr 2, 2020, 1:28 PM

#

could add all your events as buffercomponents on one entity and never destroy

mint iron Apr 2, 2020, 1:28 PM

#

yeah thats the right question, i dont remember offhand.

eager oracle Apr 2, 2020, 1:50 PM

#

Question: Is it possible to use EntityManager inside the lambda function of a Entities.ForEach? I cannot seem to be able...

opaque ledge Apr 2, 2020, 1:50 PM

#

@mint iron were you the one who suggested to use IDeclaredReferencedPrefabs to convert stuff and stash them to shared statics ? I told that entity wasnt valid but it was, so that was a total lie lol but i think what i remembered was.. if you instantiate convert and inject entity that authoring always run for each entity you want to instantiate, so since thats the case i couldnt use your suggestion.

#

i also i simply solved my problem by... getting that gameobject camera that i wanted to convert and inject to my initial scene, so it works properly lol

mint iron Apr 2, 2020, 1:52 PM

#

i don't think that was me 😦 but im writing a new project as an example scenario for my package and yesterday i was trying to figure out how to get an Entity Prefab from a SubScene and avoid runtime conversion, figured it out in the end!

opaque ledge Apr 2, 2020, 1:53 PM

#

ah, sorry to bother you with it then

warped trail Apr 2, 2020, 1:53 PM

#

@eager oracle cs Entities .WithStructuralChanges() .ForEach(()=> { }).Run();

eager oracle Apr 2, 2020, 1:54 PM

#

@warped trail Is there a reason for needing that?

#

I mean, is creating new entities really an structural change?

warped trail Apr 2, 2020, 1:54 PM

#

yes

#

you can use command buffers

eager oracle Apr 2, 2020, 1:56 PM

#

What are the consequences of using ".WithStructuralChanges"?

#

I mean, so I understand what is really going on under the hood

opaque ledge Apr 2, 2020, 1:57 PM

#

@zenith wyvern i have seen your post about exclusive entity transaction, have you able to work on it ? i was wondering how it works and what kind of situation i should use it in and should i use it over ECB

#

it basically creates a Sync point @eager oracle Sync points is where every job has to finish and no job will be scheduled until that specific job is over, after that chunks are calculated and flow continues

eager oracle Apr 2, 2020, 1:58 PM

#

so basically pauses the main thread?

opaque ledge Apr 2, 2020, 1:59 PM

#

something like that, think of it as a bottleneck, or a 4-lane road reduced to 1 lane 😄

#

so the less Sync point there is the better

eager oracle Apr 2, 2020, 2:00 PM

#

But then it is not a really good solution, no...?

opaque ledge Apr 2, 2020, 2:00 PM

#

if your system suppose to do structral changes then go for it, and if you can use ECB that would be much better

eager oracle Apr 2, 2020, 2:01 PM

#

ECB?

opaque ledge Apr 2, 2020, 2:01 PM

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https://docs.unity3d.com/Packages/com.unity.entities@0.8/manual/sync_points.html

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https://docs.unity3d.com/Packages/com.unity.entities@0.8/manual/entity_command_buffer.html

mint iron Apr 2, 2020, 2:01 PM

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it also runs normal C# code; you get the benefit of the Entities.ForEach query filtering and iterating the componets you want, but there's no performance gain really.

eager oracle Apr 2, 2020, 2:01 PM

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ah, entity command buffer

opaque ledge Apr 2, 2020, 2:01 PM

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https://www.youtube.com/watch?v=SecJibpoTYw

YouTube

Unity

Using Entity Command Buffers - Unite Copenhagen

Not all gameplay needs to happen immediately. In fact, there are many cases in which deferring commands may offer a better outcome – improved user experience, performance, etc. This session explores thinking about where deferred commands are needed and provides examples on how...

▶ Play video

fallow mason Apr 2, 2020, 2:02 PM

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Re: Visual Scripting Yes it's for DOTS only. That being said, we want to keep DOTS editing very similar to current GO editing. So even though you work in the editor with a familiar GO workflow, all is being converted to DOTS at runtime. What? How?

eager oracle Apr 2, 2020, 2:02 PM

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Well, I guess I will use it, and then see if it is performant

opaque ledge Apr 2, 2020, 2:03 PM

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imo ? dont think ECB as a way to optimize your game, think of it as a foundemantal knowledge and try to use it whenever you can. Avoiding 1 sync probably wont make too much difference, but avoiding 5 or 10 can determine if your game is playable or not

bright sentinel Apr 2, 2020, 2:10 PM

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By design ECS already has 6 sync points

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But most of them are pretty light

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Except for the simulation group, and maybe the rendering group as well

zenith wyvern Apr 2, 2020, 2:50 PM

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@zenith wyvern i have seen your post about exclusive entity transaction, have you able to work on it ? i was wondering how it works and what kind of situation i should use it in and should i use it over ECB
@opaque ledge

I haven't tried it yet, but I think you should use it in any case where you find structural changes on the main thread are becoming a bottleneck for you. Eizenhorn posted how to actually use it in another thread https://forum.unity.com/threads/how-to-use-exclusiveentitytransaction-entities-0-8.856711/#post-5647573

Unity Forum

How to use ExclusiveEntityTransaction Entities 0.8

There are a couple of samples on how to use ExclusiveEntityTransaction but they are very old.
Can anyone provide an example on how to use...

opaque ledge Apr 2, 2020, 2:52 PM

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well what i was wondering is why would i use this over ECB, or rather what are the advantages/disadvantages over ECB

zenith wyvern Apr 2, 2020, 2:52 PM

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At least in my case structural changes are not a bottleneck for me, there are plenty of other avenues for optimization so I haven't used it yet

opaque ledge Apr 2, 2020, 2:52 PM

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i mean does exclusiveentitytransaction simply makes structral changes faster ? how about sync point ? does it create one, if so its probably better to use ECB

zenith wyvern Apr 2, 2020, 2:52 PM

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The advantage over ECB is that exclusiveentitytransaction works inside a job. As in the actual structural changes occur off the main thread

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With ECB the structural changes still occur on the main thread, they just occur at different sync points, IE when the ECB gets played back

opaque ledge Apr 2, 2020, 2:55 PM

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I think i will stick to ECB for now

zenith wyvern Apr 2, 2020, 3:04 PM

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@mint iron were you the one who suggested to use IDeclaredReferencedPrefabs to convert stuff and stash them to shared statics ? I told that entity wasnt valid but it was, so that was a total lie lol but i think what i remembered was.. if you instantiate convert and inject entity that authoring always run for each entity you want to instantiate, so since thats the case i couldnt use your suggestion.
@opaque ledge

When you convert into a prefab it creates a canonical prefab entity with an actual Prefab component on it. Entities with prefab components are ignored in queries unless explicitly included, so to get your prefab entity you can query for it in some system's OnStartRunning and include the Prefab component in your query.

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That's how I'm using it at least

coarse turtle Apr 2, 2020, 3:05 PM

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👍

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Good to know about the Prefab component lol

opaque ledge Apr 2, 2020, 3:08 PM

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i could have tried that but i think i will skip for now, i tried to do this for my world UIs but couldnt work it out, maybe i will check it later on

gaunt creek Apr 2, 2020, 3:08 PM

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does anyone have any idea how the DOTS Sample character works? looking to use the sample as a base for animation/net code but would like to implement 1st person perspective client side

eager oracle Apr 2, 2020, 3:20 PM

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What is the component "PerInstanceCullingTag"? When I create a render mesh programatically doesnt seem to come, but when I use "Convert to Entity" is there..

opaque ledge Apr 2, 2020, 3:42 PM

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http://prntscr.com/rro974

Lightshot

Screenshot

Captured with Lightshot

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why this happens exactly, i have like 4k entities with 6-7 children, is this really normal ?

chilly halo Apr 2, 2020, 3:46 PM

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Hello!

Quick question... someone knows how to create a custom job type using UnsafeHashMapData?

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Where it is defined?

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Oh... its internal.
Nvm , thx

chilly halo Apr 2, 2020, 4:03 PM

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Another thing.
Trying to avoid the X/Y problem...

What I really need is a job for a NativeMultiHashmap that executes in the form of
Execute(TKey key, TValue[] values).

Is there a way to create a custom job to do something like that?

gaunt creek Apr 2, 2020, 4:40 PM

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can't you use a NativeArray (values) for the context of the job?

mint iron Apr 2, 2020, 5:08 PM

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entity create/destroy methods comparison https://gist.github.com/jeffvella/b4c3dc2b6748d62dab6dca6e6bcad780

Gist

gist:b4c3dc2b6748d62dab6dca6e6bcad780

GitHub Gist: instantly share code, notes, and snippets.

amber flicker Apr 2, 2020, 5:24 PM

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For those of us too lazy to run this - any important take aways?

mint iron Apr 2, 2020, 5:25 PM

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mmm yeah i was going to post screenshots but i did a bunch of work and then noticed some bugs, and cant be bothered again 😛 ill summarize it in a sec.

amber flicker Apr 2, 2020, 5:26 PM

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🤣 cool

eager oracle Apr 2, 2020, 5:34 PM

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Maybe someone can answer me this...

If this is not allowed

Entities.ForEach(( ref RenderMesh renderMesh) =>

because I have to remove the ref then how can I do to modify the mesh in my System?

warped trail Apr 2, 2020, 5:36 PM

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with SetSharedComponentData? 🤔

eager oracle Apr 2, 2020, 5:37 PM

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@warped trail but I need the entity for that, no?

safe lintel Apr 2, 2020, 5:37 PM

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use .WithAll for the rendermesh

warped trail Apr 2, 2020, 5:37 PM

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Entities.ForEach(( Entity entity, RenderMesh renderMesh) =>```

safe lintel Apr 2, 2020, 5:37 PM

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or that

eager oracle Apr 2, 2020, 5:37 PM

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Aha... let me see

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If the first element is Entity, none of the components can be a reference, no?

chilly halo Apr 2, 2020, 5:40 PM

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@

can't you use a NativeArray (values) for the context of the job?
@gaunt creek
I want skip the step of allocating new arrays in the mainthread as far as I can.

warped trail Apr 2, 2020, 5:40 PM

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i guess you have to use WithStructuralChange and Run🤔 @eager oracle

eager oracle Apr 2, 2020, 5:42 PM

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@warped trail Altering a mesh in a RenderMesh is a considered a StructuralChange?

zenith wyvern Apr 2, 2020, 5:43 PM

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RenderMesh is a shared component so yes, if you change any value in it it's a structural change

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Or I should say if you set any value in it

eager oracle Apr 2, 2020, 5:44 PM

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Interesting that, even though I am using Entities.WithStructuralChanges().ForEach , I still get this error: InvalidOperationException: Structural changes are not allowed during Entities.ForEach. Please use EntityCommandBuffer instead.

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I thought the .WithStructuralChanges would take care of that 😛

gaunt creek Apr 2, 2020, 5:44 PM

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@chilly halo isn't that why they added.SheduleParallel()?

zenith wyvern Apr 2, 2020, 5:45 PM

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You need to use .Run as well

eager oracle Apr 2, 2020, 5:45 PM

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@zenith wyvern I am using it already

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        Entities.WithStructuralChanges().ForEach((Entity entity, MeshDataComponent meshDataComponent, RenderMesh renderMesh) =>
        {
            if (meshDataComponent.isRendered) return;

            Mesh mesh = new Mesh();
            MeshData meshData = MeshData.LoadDataAt(Vector3.zero, meshDataComponent.chunkSize, worldConfig);

            mesh.SetVertices(meshData.vertices);
            mesh.SetTriangles(meshData.triangles, 0);
            mesh.SetUVs(0, meshData.uvs);
            mesh.RecalculateNormals();

            EntityManager.SetSharedComponentData(entity, new RenderMesh { mesh = mesh, material = material });
            EntityManager.SetComponentData(entity, new RenderBounds { Value = mesh.bounds.ToAABB() });

            meshDataComponent.isRendered = true;

        }).Run();

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Even though... now my Intellisense is telling me that "ForEach" is returning "void"

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😕

zenith wyvern Apr 2, 2020, 5:47 PM

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This isn't in a ComponentSystem is it?

eager oracle Apr 2, 2020, 5:48 PM

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SystemBase

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ComponentSystems are being phased out, no?

warped trail Apr 2, 2020, 5:48 PM

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this thing works fine🤔 cs Entities .WithStructuralChanges() .ForEach((Entity entity, RenderMesh renderMesh)=> { renderMesh.mesh = new Mesh(); //renderMesh.material = //DoSomething with material EntityManager.SetSharedComponentData(entity, renderMesh); }).Run();

zenith wyvern Apr 2, 2020, 5:48 PM

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Yeah, just making sure

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Yeah I can only assume the error you're getting is not from the code you posted, unless I'm missing something

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It "MeshComponentData" a shared component? You should use in or ref if not

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And put RenderMesh before it

eager oracle Apr 2, 2020, 5:49 PM

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You mean "MeshDataComponent", no?

zenith wyvern Apr 2, 2020, 5:50 PM

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Yeah

warped trail Apr 2, 2020, 5:50 PM

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without in or ref you are getting just copy

eager oracle Apr 2, 2020, 5:51 PM

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If I use this...

Entities.WithStructuralChanges().ForEach((Entity entity, ref MeshDataComponent meshDataComponent, RenderMesh renderMesh) =>

I get this error

Delegate 'Invalid_ForEach_Signature_See_ForEach_Documentation_For_Rules_And_Restrictions' does not take 3 arguments

zenith wyvern Apr 2, 2020, 5:51 PM

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Put RenderMesh first

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After entity

eager oracle Apr 2, 2020, 5:51 PM

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WOW

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I would have never guessed that

zenith wyvern Apr 2, 2020, 5:51 PM

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Order of arguments is value then ref then in

eager oracle Apr 2, 2020, 5:52 PM

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Ok, learned something new

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lets see if compiles now

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I keep getting this error:

InvalidOperationException: Structural changes are not allowed during Entities.ForEach. Please use EntityCommandBuffer instead.

This is the whole file

using UnityEngine;
using Unity.Entities;
using Unity.Rendering;
using Unity.Mathematics;
using Extinction.Renderer;

public class ChunkRenderSystem : SystemBase
{
    Material material;
    Extinction.Config.World worldConfig;

    protected override void OnCreate()
    {
        material = Resources.Load("WorldMaterial", typeof(Material)) as Material;
        worldConfig = Resources.Load("WorldConfig", typeof(Extinction.Config.World)) as Extinction.Config.World;
        worldConfig.Setup();
    }

    protected override void OnUpdate()
    {
        Entities.WithStructuralChanges().ForEach((Entity entity, RenderMesh renderMesh, ref MeshDataComponent meshDataComponent) =>
        {
            if (meshDataComponent.isRendered) return;

            Mesh mesh = new Mesh();
            MeshData meshData = MeshData.LoadDataAt(Vector3.zero, meshDataComponent.chunkSize, worldConfig);

            mesh.SetVertices(meshData.vertices);
            mesh.SetTriangles(meshData.triangles, 0);
            mesh.SetUVs(0, meshData.uvs);
            mesh.RecalculateNormals();

            EntityManager.SetSharedComponentData(entity, new RenderMesh { mesh = mesh, material = material });
            EntityManager.SetComponentData(entity, new RenderBounds { Value = mesh.bounds.ToAABB() });

            meshDataComponent.isRendered = true;

        }).Run();
    }
}

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Despite using WithStructuralChanges ...

amber flicker Apr 2, 2020, 5:54 PM

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oops misread sorry

eager oracle Apr 2, 2020, 5:54 PM

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?

amber flicker Apr 2, 2020, 5:55 PM

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deleted an earlier comment where I misread something - now I've confused things more 😄

eager oracle Apr 2, 2020, 5:55 PM

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Btw, my intellisense is still complaining at the .Run() , saying that ForEach returns void

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(even though Unity does not complain)

amber flicker Apr 2, 2020, 5:56 PM

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ah that's usually an indication that the signature of the foreach is wrong or something's wrong in the body

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does it go away if you ref the RenderMesh?

eager oracle Apr 2, 2020, 5:57 PM

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I cant ref RenderMesh

amber flicker Apr 2, 2020, 5:57 PM

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in fact you don't need the RenderMesh right? how about WithAll RenderMesh instead?

eager oracle Apr 2, 2020, 5:58 PM

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Indeed I dont. This suffices

amber flicker Apr 2, 2020, 5:58 PM

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honestly not tried to use the lambda with ISCDs like that but I can see how it would make sense for RenderMeshes

eager oracle Apr 2, 2020, 5:58 PM

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Entities.WithStructuralChanges().ForEach((Entity entity, ref MeshDataComponent meshDataComponent) =>

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But it doesnt fix my problem

amber flicker Apr 2, 2020, 5:58 PM

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ok, will copy/paste, brb

eager oracle Apr 2, 2020, 5:58 PM

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Thanks

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Weird... this alone also gives me the error

using UnityEngine;
using Unity.Entities;

public class ChunkRenderSystem : SystemBase
{
    protected override void OnUpdate()
    {
        Entities.WithStructuralChanges().ForEach((Entity entity, ref MeshDataComponent meshDataComponent) =>
        {
        }).Run();
    }
}```

warped trail Apr 2, 2020, 6:01 PM

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what is MeshDataComponent?🤔

amber flicker Apr 2, 2020, 6:01 PM

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yea - I don't get errors - I'm guessing MeshDataComponent is a shared component?

eager oracle Apr 2, 2020, 6:01 PM

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A component of mine

using Unity.Entities;

public struct MeshDataComponent : IComponentData
{
    public bool isRendered;
    public int chunkSize;
}```

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It is really dumb

zenith wyvern Apr 2, 2020, 6:02 PM

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You're saying if you remove the ForEach from this code

using UnityEngine;
using Unity.Entities;

public class ChunkRenderSystem : SystemBase
{
    protected override void OnUpdate()
    {
        Entities.WithStructuralChanges().ForEach((Entity entity, ref MeshDataComponent meshDataComponent) =>
        {
        }).Run();
    }
}

Then the error goes away?

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Like you're 100% this code is what's causing the error?

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Like I said earlier it seems like you're misattributing your error to this code

eager oracle Apr 2, 2020, 6:03 PM

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It does compile, the error appears when I press play

warped trail Apr 2, 2020, 6:04 PM

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maybe error from another job?

zenith wyvern Apr 2, 2020, 6:04 PM

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What error appears

eager oracle Apr 2, 2020, 6:04 PM

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Urrr.... let me see again

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If it is coming from another system, im gonna kill myself

zenith wyvern Apr 2, 2020, 6:04 PM

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It can't be the no structural changes error because that's a compile time error

warped trail Apr 2, 2020, 6:05 PM

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problem solved🥳

eager oracle Apr 2, 2020, 6:06 PM

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Ok, yes... it was another system

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🤦

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But whyyyyy? Before was working

bright sentinel Apr 2, 2020, 6:07 PM

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Maybe you need to change your name 😂

eager oracle Apr 2, 2020, 6:07 PM

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Great...

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Because I was using "WithoutBurst" instead of "WithStructuralChanges"

bright sentinel Apr 2, 2020, 6:07 PM

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(Just kidding btw9

eager oracle Apr 2, 2020, 6:07 PM

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😢

mint iron Apr 2, 2020, 6:08 PM

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@amber flicker with 1 archetype, 2 components, '<' denotes left-side is faster than

Destroy for 25 entities
* EM NativeArray < EM individually < ECB < Query
Destroy for 100 entities
* EM NativeArray < ECB < EM Query < EM Individually
Destroy for 250 entities
* EM NativeArray < ECB(Burst) < EM Query < ECB(C#) < EM Individually
Destroy for 1000 entities
* EM Query < EM NativeArray < ECB < EM Individually

Create for 25 entities
* EM NativeArray < EM Individually < ECB < Create+Add
Create for 100+ entities
* EM NativeArray < ECB < EM Individually < Create+Add

warped trail Apr 2, 2020, 6:10 PM

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ecb then 😅

bright sentinel Apr 2, 2020, 6:11 PM

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I think you'd need a few tens of thousands if not more to get any reliable results

mint iron Apr 2, 2020, 6:11 PM

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its even faster not destroy if you don't have to, which is one of the benefits of an event system, it knows if it needs the exact same number of entities this frame, and can just neither create nor destroy, and skip to setting component data.

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yup, don't take that as gospel, those weren't from a build (just editor with safetys/leak-detect/debugger off, burst on).

amber flicker Apr 2, 2020, 6:14 PM

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build & larger numbers would be interesting - anything above significantly (i.e. 2x+) slower than alternatives?

bright sentinel Apr 2, 2020, 6:15 PM

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You could write some simple performance tests to figure things out as well

mint iron Apr 2, 2020, 6:16 PM

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this is what i came up with https://gist.github.com/jeffvella/ad499fb3e1d6642f30f08dfd36a63dc8

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probably needs to re-test with multiple archetypes, ECB and query would slow down having to switch around chunks more.

verbal pewter Apr 2, 2020, 6:22 PM

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There's no way for BlobAssets to reference each other, is there?

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In that, I need two of them to reference the other. I know I can have one reference the other one, but from my understanding there's no way to reserve a pointer, pass it as a value to a BlobAsset, then create another BlobAsset at that pointer.

eager oracle Apr 2, 2020, 6:24 PM

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Eeeey, rendering!

📎 unknown.png

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Finally

verbal pewter Apr 2, 2020, 6:24 PM

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Nice 😁

eager oracle Apr 2, 2020, 6:25 PM

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Now for the whole map

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Is there an Util to transform float3 into Vector3?

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Not that it is much work, but just in case

low tangle Apr 2, 2020, 6:29 PM

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Already casts just fine on most cases

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If not just explicit cast it (vector3)myvar

eager oracle Apr 2, 2020, 6:33 PM

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Oh, nice

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Oh yeah, a 9x9 Chunk grid

📎 unknown.png

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🙂

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Finally!

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Now I have to learn how to build systems that connect 2 different entity types...

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So that when the player is too far away from the center, it re-renders

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Maybe using 2 different .ForEach in the same system??