archived-dots

[frigid needle]

unless you have gravity

that cube is doing what its supposed to do

[tight blade]

I do have gravity, and friction

[frigid needle]

if you drop it onto the ground does it keep doign that?

[tight blade]

also set in the inspector, on physics body and physics shape, respectively

[frigid needle]

like when it lands

does it keep moving when it lands?

[tight blade]

they are both a few decimal points above the surface. theyre dropping a tiny bit at the start of the video

if I increase the height, the result is the same

im very curious as to what is going on that causes that infinite lateral drift lol

[frigid needle]

hmmm thats very weird

because I was actually struggling to remove friction before lmao

[tight blade]

are you adding it in code? its definitely a really easy property in the physics shape authoring component

[frigid needle]

the surface it collides with also has a body and shape right?

[tight blade]

well, it has a shape, not a body

but friction is a property of the shape, and when it has no body its just treated as static

[frigid needle]

well damn i have no idea why it doesnt just stop

what happens

if you put the cube

INSIDE the ground

if it doesnt move then we can be sure its colliding properly

[tight blade]

lol, if its in the ground it gets flung out

which is normal, im pretty sure. Ive never seen anything that clips just get stuck

you know, I wonder if it would work if the surface, rather than being flat, was, like, corrugated

because that's how it works in real life, I think. when moving in line, the "bumps" hit more of the surface thats moving laterally, whereas one moving in line would ride over all the bumps and only the front part of the ice skate would hit the bump

... how do physics materials work? would that help me here?

I don't know the first damn thing about them, but from the name alone it sounds relevant

[warm panther]

Well you basically need a friction tensor that works similar to the inertia tensor.

you might get it to work well with the inertia tensor really.

Try it and set a higher y and z value, making it harder for the skate to turn sideways.

(it's in the mass distribution for your physics shape authoring)

You can also try wheelcolliders, but I don't know if these work in DOTS Physics yet.

[frigid needle]

can an inertia tensor be used with DOTS physics?

[tight blade]

Oh that's interesting. You're saying that the forward momentum would try to be converted to angular momentum, and then with the inertial tensor the angular momentum would be diminished, so the effect is that it would slow down

[warm panther]

@frigid needle it can

This is for a ship, for instance. Works mostly fine.

[gusty comet]

Quick ? How do you change the size of a SharedStatic and reuse the key?

Example: You have a SharedStatic<Component>, and Component contains other SharedStatic. Later, as your design has been worked out, Component doesn't need SharedStatic data anymore, so you drop that. Now, the SharedStatic<Component> needs a new key. But how does Unity remember the old one? How do we get rid of that old junk?

[opaque ledge]

well, in a couple of patches ago i changed some stuff in shared statics and when i press start Unity complained about shared static size being less or great (idk the exact error), so i simply restart the editor and it worked

[warm panther]

Help - something is... waiting... in my prototype game. (2020.1 beta)

As in, CPU is locked to a suspicious 16.7 ms. Generally, it should be around 5 ms, and from ECS alone, around 5 ms. Profiler shows a significant waitstate. The frame rate used to be around 150-200 fps, now it's at 60 and drops into the 40s. Interestingly, it feels worse on the screen.

I think this came in with either VFX Graph or the newest Render Pipeline.

Maybe it's Odin inspector.

Not really though, something in the game is also waiting.

So I suspect it's SystemBase Job Dependencies.

[solar spire]

add a GPU profiler

[warm panther]

Profiler got some problems actually...

that makes the GPU profiling pretty unreliable But render thread is at 1.1ms ...

And in edit mode, I get exactly the frame rate I used to. I had a similar problem before, it went away between render pipeline updates.

When I had the issue before, the negative "saved by batching" figure was also there.

That seems to be a problem with the Hybrid Renderer V2

I'll try the 2020.2 alpha

But looking at that profiler output I posted at "not really", it seems clear that some dependency in my systems that live in simulationsystemsgroup causes this wait.

I hate ECS System Dependencies.

I would really like a "Postupdatecommands" type EntityCommandBuffer equivalent in SystemBase.

Maybe i don't understand the new "Dependency" property though.

[storm ravine]

It's not new at all. Just renaming. It works absolutely the same as it was at beginning of input deps of JobComponentSystem.

[warm panther]

    public class VesselFocusManagement : SystemBase
    {
        private EntityCommandBufferSystem _ecbs;
        protected override void OnCreate()
        {
            _ecbs = World.GetOrCreateSystem<EndSimulationEntityCommandBufferSystem>();
        }

        protected override void OnUpdate()
        {
            var buffer = _ecbs.CreateCommandBuffer();
            var targets = GetBufferFromEntity<EntityListElement<TagCameraTarget>>();
            
            //Propagate UI focus to all vessel children that gained focus
            Dependency = Entities
                .WithChangeFilter<TagUIFocus>()
                .WithNone<UntagUIFocus>()
                .WithAll<TagPlayer, Vessel, TagUIFocus>()
                .ForEach(
                    (Entity entity) =>
                    {
                        var cam_targets = targets[entity];
                        for (var i = 0; i < cam_targets.Length; i++)
                        {
                            buffer.AddComponent<TagUIFocus>(cam_targets[i]);
                        }
                    }
                ).Schedule(Dependency);
            
            _ecbs.AddJobHandleForProducer(Dependency);
        }
    }

This is what a lot of my systems look like.

i suspect this fucks over the dependency, but they won't schedule unless I tell the ECBS to wait.

(slightly shortened so I could paste it here, it has one more .Schedule that also deals with the UntagUIFocus component)

[storm ravine]

Negative saved by batching it's known for SRP batcher. For profiling real batches with SRP batcher you should use script which Unity posted on forum (currently, definitely will be improved in future).

[warm panther]

Well 2020.2 alpha has HALF the framerate, so change is good? 😄

[storm ravine]

This is HALF not because 2020.2 or 2020.1.

More over what is first error of list of your errors above

This EndSample errors it's just result of earlier error which prevent some loop finishing which should close profiler marker

[warm panther]

Yes.

But there's none.

Let me turn on stack traces etc.

(the no camera target found is a controlled execution path one of my monobehaviours, no exception)

Stack traces was actually on in alpha, weird. I'll go back to beta. I was just switching to see if I accidentally used a package that required a future version (like using Hybrid V2 in Unity 2020.1 pre beta9)

[storm ravine]

This with Burst compilation disabled and and Full stack traces enabled? And Jobs Debugger enabled?

[warm panther]

Let me turn off burst.

Project doesn't import without crashing now, even after reverting in version control system. Fml, I'll try to get it to load again.

[storm ravine]

Btw you can remove Dependency = and replace Schedule(Dependency) to Schedule(), Entities.ForEach and Job.WithCode will handle it automatically by codegen.

[warm panther]

This is the actual system.

And I need to do _ecbs.AddJobHandleForProducer

[storm ravine]

_ecbs.AddJobHandleForProducer(Dependency) will work the same even without Dependency = and Schedule(Dependency)

[warm panther]

thanks

[storm ravine]

This system it's not what will run

Open DOTS compiler and look to what it will be compiled

This is why you can have magic like ForEach delegates, automatic Dependency etc. because it's just template for codegen

[warm panther]

I turned on stack traces and the debugger and turned off burst compilation

No change in console output

[pulsar jay]

It seems like its impossible to put a native container into another native container. I am trying to build a data structure for layers of tiles. Any idea how to do this: NativeArray<NativeHashMap<CellData, Entity>>?

[wary ibex]

Are empty systems costly for performance? i.e. systems where I may override OnCreateManager or OnCreate, but not really do any work in OnUpdate

[pulsar jay]

@wary ibex I dont think so they should not be run at all if they dont have any entities to operate on

[wary ibex]

👍 thanks

is it important to call base.OnCreate()?

[storm ravine]

It seems like its impossible to put a native container into another native container. I am trying to build a data structure for layers of tiles. Any idea how to do this: NativeArray<NativeHashMap<CellData, Entity>>?
@pulsar jay you can use unsafe collections for that

[pulsar jay]

Mhh will have a look at it. Although it sounds... unsafe? 🤔

[storm ravine]

native collections use them under hood

[pulsar jay]

Still struggling to decide if another data structure is even necessary or if I should query for the specific tile via entity queries somehow

[storm ravine]

Only difference is native collecttion wrappers have dispose sentinel and safety handle for tracking memory leaks and race conditions

[pulsar jay]

I see. But I guess there is a reason they wount allow nesting native collections? I am afraid I will run into the exact problem they are trying to prevent with this restriction

[storm ravine]

Well with unsafe collections you shuld understand what you're doing 🙂 This restrictions here for safety

(safety handle\dispose sentinel)

But about nesting problem here a bit different

[pulsar jay]

do you have any good reading materials on unsafe collections?

[storm ravine]

Source code

[pulsar jay]

ok I see 😅

[storm ravine]

About nesting itself - this is not safety restriction itself

But just native container restriction

It should contain only unmanaged data

But native containers itself contains managed fields, which prevents you for nest them in to each other 🙂

[pulsar jay]

But native containers itself contains managed fields, which prevents you for nest them in to each other 🙂
@storm ravine Ahh, didnt know that. I thought it was unmanaged

[storm ravine]

And this managed thigs it's exactly what Unity using for leak detection tracking

For example class DisposeSentinel

This is managed, thus whole NativeArray (for example) struct will fail unmanaged check

[pulsar jay]

thats goo to know thx 🙂

[scarlet inlet]

I have one doubt about EntityCommandBuffer. Can I create it once (i.e. on OnCreate) and reuse it, or I am forced to create it every time? My problem is that it's used in methods that can be called thousands of times per frame

it seems from the code that once it's flushed it's self disposed

[tawdry tree]

The normal pattern is

class SomeSystem : SystemBase {
  private EntityCommandBufferSystem _ecbSystem;  

  void OnCreate(){
    //Exchange type with whichever you need. Typically EndSimulation[ECBS] 
    _ecbSystem = World.GetOrCreateSystem<EntityCommandBufferSystem>();
  }

  void OnUpdate() {
    //With .ToConcurrent if using .Schedule or .ScheduleParallel
    ecb = _ecbSystem.CreateCommandBuffer(); 

    Entities
      .ForEach(/*...*/)
      .Run();

    //For .Schedule or .ScheduleParallel you need to use Dependency
    Dependency = Entities
      .ForEach(/*...*/)
      .Schedule(Dependency); //Or similar overload for -Parallel
    _ecbSystem.AddJobHandleForProducer(Dependency);
  }
}

[warm panther]

Okay, I am 99% sure my frame rate problem is some kind of dependency constellation that reaches into the next frame, causing effectively double or triple frames with a single render or something.

As soon as I stop rendering all my more complex entities, the framerate goes way up. If I render even one, the framerate tanks to < 60.

I can count the number of systems I have on two hands. So this shouldn't be so hard.

I wonder:

    [UpdateBefore(typeof(ExecuteFire))]

What if both these systems (the one the attribute is on, and the other) both call AddJobHandleForProducer for their Dependency on the EndSimulationCommandBufferSystem?

And in fact, what do UpdateBefore and UpdateAfter even do, with systems that have their main workload sheduled in Jobs?

Simpler example: I need to run a system that copies a Translation and a PhysicsVelocity from another entity after it has been changed.

    [UpdateInGroup(typeof(VesselSimulationGroup))]
    [UpdateAfter(typeof(VesselControl))]
    public class ShieldFollowing : SystemBase
    {
        protected override void OnUpdate()
        {
            var transforms = GetComponentDataFromEntity<LocalToWorld>();
            var velocities = GetComponentDataFromEntity<PhysicsVelocity>();
            
            Entities.WithAll<Shield>().ForEach( 
                (Entity entity, ref Owner owner, ref Translation translation, ref Rotation rotation) =>
                {
                    rotation.Value = transforms[owner.entity].Rotation;
                    translation.Value = transforms[owner.entity].Position;

                    var owner_vel = velocities[owner.entity];
                    velocities[entity] = owner_vel;
                }
            ).Schedule();
        }
    }

    [UpdateInGroup(typeof(VesselSimulationGroup))]
    public class VesselControl : SystemBase
    {
    // ... update a bunch of PhysicsVelocities for a number of entities, n ~= 100
    Entities.Foreach(blahblah).Schedule();
    }

anything wrong with that?

    [UpdateInGroup(typeof(SimulationSystemGroup))]
    [UpdateBefore(typeof(BuildPhysicsWorld))]
    public class VesselSimulationGroup : ComponentSystemGroup {}

ah forgot, that might be crucial info.

I think I'm doing this way wrong.

[scarlet inlet]

The normal pattern is

class SomeSystem : SystemBase {
  private EntityCommandBufferSystem _ecbSystem;  

  void OnCreate(){
    //Exchange type with whichever you need. Typically EndSimulation[ECBS] 
    _ecbSystem = World.GetOrCreateSystem<EntityCommandBufferSystem>();
  }

  void OnUpdate() {
    //With .ToConcurrent if using .Schedule or .ScheduleParallel
    ecb = _ecbSystem.CreateCommandBuffer(); 

    Entities
      .ForEach(/*...*/)
      .Run();

    //For .Schedule or .ScheduleParallel you need to use Dependency
    Dependency = Entities
      .ForEach(/*...*/)
      .Schedule(Dependency); //Or similar overload for -Parallel
    _ecbSystem.AddJobHandleForProducer(Dependency);
  }
}

@tawdry tree yes. I understand that patterns are designed around the normality and not the exception, but in my case I need to use it inside a callback not an update. I thought maybe I can hold the ECB and update it every OnUpdate

even if the callbacks will not be called

[tawdry tree]

In a callback? Then you've already broken from the ECS/DOTS patterns
What are you using callbacks for?

[scarlet inlet]

it's on entity add and remove, but it's not UECS

I understsand that ECS usually works with polling, in svelto the only exception is Add/Remove entities. I may change it one day to optimize it though

[tawdry tree]

If it's not UECS, then you need to find an appropriate forum for whatever you're using

[scarlet inlet]

sure so you are saying that there never will be a case where it will be used inside a method that is not called from an Update

if you are sure about it, then fine 🙂

anyway the holding it + update actually works

[tawdry tree]

ECB are specifically made for using within Update, to buffer any changes until later, when they can all be replayed in an efficient manner

[scarlet inlet]

yes that doesn't mean that must be used from inside an Update tho

but I can accept that is the normal pattern

[tawdry tree]

Changing entities outside the unity frame/game loop is already a bit sketch, but if you want to use ECB for that the pattern should be the same -store the _ System_, grab the ECB before each use

[scarlet inlet]

well you don't have to go much far to see this pattern broken. Physic ECS uses a lot of callback in forms of jobs

[tawdry tree]

Those jobs are within the ECS system loop, though

[scarlet inlet]

ah but mine is too

that's not the problem, the problem is that the framework calls it, not the system

[tawdry tree]

So it is ultimately called from an update method?

[scarlet inlet]

of course, where else?

but I call it once per entity removed, not once per tick

so in one tick it can be called hundreds of times

[tawdry tree]

So whatever makes the callback should have one ECB it sends to all the other calls, then?

[scarlet inlet]

sure I understand your point

but the framework knows nothing about ECB in this case

[tawdry tree]

I mean in an ideal sense -you only want to make one ECB per frame loop

Are you using some other framework together with UECS?

[scarlet inlet]

yes Svelto 🙂

this works and I will go with it:

 public void Remove(ref UECSPhysicsEntityStruct entityView, EGID egid)
        {


            _entityCommandBuffer.DestroyEntity(entityView.uecsEntity);
        }

        protected override void OnUpdate()
        {
            _entityCommandBuffer = _submissionEntitiesCommandBufferSystem.CreateCommandBuffer();
        }
        
        EntityCommandBuffer _entityCommandBuffer;

wait

I will need to re test it haha

but regardless I agree that I should remove this exception from the framework. It should be called once for all the entities added/remove. it's in my to-do list anyway. In any case I wanted to have the confirmation about the fact that it's better to have the ECB creation just once

thanks

[warm panther]

How do I properly order the execution of SystemBase descendants (that .Schedule their workload?)
UpdateBefore and UpdateAfter seem somewhat meaningless in that context.
I'm currently fighting some kind of system dependency hell where I suspect I have a system that waits until the next frame for a dependency to finish.
this fucks up the profiler, making it impossible to find the actual culprit; among other things, and cuts my framerate down to 33%

[tawdry tree]

Step one here would be to disable systems until you find the offender

Other than that, minimize synchronization points and dependencies as much as possible.

[warm panther]

I disabled all of them.

I boiled it down to a single cube in a subscene

Cube is there: frame rate tanks

Cube is gone: framerate 180+

[tawdry tree]

And what systems affect said cube?

[warm panther]

However, the profiler issue remains with or without the cube, so... (there are some more entities, admittedly)

If I deactivate these, only the time they are listed with in the entity debugger gets deducted.

If I deactivate ALL systems in the entity debugger, the frame time still stays high

if I remove the cube (either from subscene or from main scene disabling ConvertToEntity), the frame rate stays high

If I remove the Meshrenderer, the speed is high.

Physics shape seems irrelevant.

damned hybrid renderer again

[tawdry tree]

Well, there you go

[warm panther]

Rebuilt the entire packages directory from scratch. Now the cube renders at 350 fps.

I could puke... this is my vacation, I want to work on my project not on unity's package dependency bull...

But my old friend "very slow entity conversion" is back.

Yay.

[tawdry tree]

First time I enter play after bigger file changes (packages, or checking out a different Git branch) I tend to get somewhat longer load time.
I haven't had issues in my (admittedly rather simple) toybox project, but in another one that's constant.

Long time to get to play is one of the things which put me off from UE, too, so I would rather not have it.

[warm panther]

usually it's 200 ms

except when it isn't.

then it's 20+ sec. this one didn't finish in 4 minutes.

Nice.

after a good start & end yesterday, today definitely took a turn for the worse.

well, I got my fps back up to 170 with a few hundred entities

Profiler still doesnt work though

Render seems healthy-ish (I remember getting over 1000 fps on this machine with 1 or 2 models like that)

but that was with a simpler camera stack.

framerate still drops in half when the game runs though. I still think there's the dependency problem with the systems.

So. QUESTION - how do I properly and deterministically Schedule() several SystemBase descendants so one runs when the other is done, and all of them need to finish within their System Group?

And each runs on every tick. (later on, I might want them to consume a Tick entity of sorts so i could pump them multiple times in one playerloop, or not at all, but for now, just once per frame is good)

[wanton apex]

Hi, i'm looking at the Animation package changelog, and it seems that they added an automatic Animator Conversion. Does somebody had test it ? I tried it, the conversion is working, but I don't know how to play an animation after converting it. I look at the samples, but it was not updated from 0.2 version.
Does somebody have feedback to give about this? (sorry for my bad english)
https://docs.unity3d.com/Packages/com.unity.animation@0.5/changelog/CHANGELOG.html

[mint iron]

i also briefly did the same, but there seems to be no examples on how to actually trigger an animation.

[wanton apex]

So sad...

@spark glade maybe you tested the last version ? I saw on github that you played with the Animation package

[tawdry tree]

@warm panther UpdateBefore and UpdateAfter - use only one per "link".
Consider making a dependency flowchart and see what actually needs to finish before others start. You can likely say that a set of systems need to finish before some other system, which in turn needs to finish before some others can run, etc. Simplify the graph where possible.
The earliest systems can use .Run() if they aren't too heavy.
Disable all systems, then turn on only one (and possibly dependencies) to do some basic profiling and see if anything is particularly heavy.
just some ideas off the top of my head - most likely you've created a bug with dependencies. (bug as in you caused it to do bad stuff, not "found" a bug)

[warm panther]

Ultimately I want my gameplay simulation to be 100% deterministic. That means money can't be spent before it's been earned, collisions need to be resolved at the same time, etc.

I thought UpdateBefore starts the Update before the other system, but there's no way to tell it Completes before the other sys starts... or does it?

[wary ibex]

Is SystemBase more preferable than JobComponentSystem?

[warm panther]

Yes, Rellfy

Also easier to use.

(JCS is deprecated as far as I know)

[wary ibex]

Definitely not deprecated in the version I'm using (which I think is the latest), but ECS is a bit confusing sometimes 😄

[opaque ledge]

you on 0.11 ? then yeah, its depracted

but difference is very little

[wary ibex]

I dont get any warnings about it being deprecated

[spark glade]

@spark glade maybe you tested the last version ? I saw on github that you played with the Animation package
@wanton apex I have not yet tried 0.5, mainly because the changelog didn't mention URP compatibility

[wanton apex]

Ok thank you, so I will wait for samples, it's look too much complicated for now

[wary ibex]

Can I modify a value of ISharedComponentData?

[opaque ledge]

yeah

[wary ibex]

If you guys were to have an input component applied to thousands of entities, would you use a singleton or shared component data?

[opaque ledge]

singleton

try to get away from shared component data as far as you can, they are not really for gameplay, i think they are more for advanced ECS stuff

having shared component data in your entities with different values actually split the chunk, which makes things go slower

[wary ibex]

why?

dont singletons destroy the benefits in cache line that we get in ECS while looping entities?

[opaque ledge]

because.. thats what they do 😄

you get the singleton value in main thread to a local variable and use that in your job

techincally you might be right, but since that data will be used throught the job your hardware will properly cache it

@storm ravine can give you more info if you are really interested in it

i myself a just a random scrub

[wary ibex]

why did you mention shared component data with different values?

because of parallel jobs? so that if I change the value it wont be synchronous?

[opaque ledge]

shared component datas with different values split your chunks

while having 'normal' ICD, wont

[storm ravine]

Purpose of SCD - filtering and grouping things.

[wary ibex]

well they are used for rendering meshes

[tawdry tree]

@warm panther UpdateBefore and UpdateAfter should guarantee that the Dependency of the later system effectively "contains" the JobHandle of the former.
Using the .Schedule(JobHandle) overload means you can (and have to!) control the output JobHandle yourself.

[storm ravine]

Entities with same SCD will be divided to groups in chunks with same SCD hash code.

[wary ibex]

I want a good way to store the input for the current cursor position

This gif is just using regular components, so I have the same component value in 20k entities

but I have a natural repulse to the word singleton

[tawdry tree]

@wary ibex WTF am I looking at here
Also, singleton entity sounds correct for storing the cursor position in an ECS manner

The singleton pattern, like any other, is merely a tool, and as long as you use it wisely it's not bad

[wary ibex]

Im glad you asked, I call it DETERMINISTIC REALTIME RECTILINEAR CONTROLLER ON A PLANAR ENVIRONMENT

[opaque ledge]

thats pretty cool name

[storm ravine]

well they are used for rendering meshes
@wary ibex Yes because class ICD wasn't a thing at beginning and Material haven't blittable equivalent yet. And it used for rendering (also) for exact same purpose - grouping same render mesh to different chunks (with additional MaximumChunkCapacity(128)) for better packing data for batch render group.

[wary ibex]

What do you mean by class ICD?

[storm ravine]

class implementing IComponentData interface which can contain managed stuff (but without splitting entities to different chunks)

And of course only for main thread work

[wary ibex]

oh right, IComponentData

Would you mind telling me the difference between a class and a struct implementing ICD then? or is there a place I can read about this?

Why would it replace ISCD?

[tawdry tree]

Class ICD can use managed datatypes in fields (so classes), struct ICD can only use blittable types (structs built from primitive types)
You cannot use class ICDs in bursted jobs.

[wary ibex]

is the data shared between entities in any way?

[tawdry tree]

For rendering specifically, class ICD would let you reference Material and Mesh, which is the datatypes used by the renderer. Both of them are classes.

It is "shared" only so far as in grouping into chunks

[wary ibex]

one per chunk?

[tawdry tree]

If you have four otherwise similar entities, but one of them have a different value in the ISCD, you will have two chunks, and the different one will be alone

One ISCD value can still have multiple chunks, but you will never have different ISCD values in one chunk

"value" is a keyword here, and can be either a reference (so any class) or a struct/primitive value

And changing the ISCD for one entity does not change other entities with a same-value ISCD.

[amber flicker]

heads-up new urp preview for those interested

[wary ibex]

I tried using a class ICD and it's null when I loop it 😄

nevermind, I had to initialise it because it's a class

[storm ravine]

This gif is just using regular components, so I have the same component value in 20k entities
@wary ibex why you even need store cursor position on every entity? Why not just pass cursor position to Job\ForEach?

[wary ibex]

Using a singleton you mean?

I am trying to go with class ICD now if it means only one component per chunk.

[storm ravine]

Would you mind telling me the difference between a class and a struct implementing ICD then? or is there a place I can read about this?
@wary ibex https://docs.unity3d.com/Packages/com.unity.entities@0.11/manual/component_data.html#icomponentdata

I am trying to go with class ICD now if it means only one component per chunk.
@wary ibex it doesn't mean that.

class ICD behave similar to struct ICD difference only storing managed things (and as result only for main thread processing)

[wary ibex]

ouch

so for shared data, what should I do?

just go with singletons?

[storm ravine]

Using a singleton you mean?
@wary ibex singleton entity, just direct value inside system, etc.

so for shared data, what should I do?
@wary ibex depends on what it's shared data

For cursor input using ISCD on entities - make no sense

[wary ibex]

just direct value inside system
not sure what you mean by this

in my case the cursor position is obtained by adding user input to a float2

[storm ravine]

For things like RenderMesh (same mesh\Material for group of entities) - make sense

Cursor input - not shared data in meaning of...well shared data despite it used by everyone 🙂 cursor input similar to some input data for jobs, like delta time. You don't need store it on entities.

not sure what you mean by this
@wary ibex your system which moves cubes just read cursor position in OnUpdate and pass it in to job\ForEach as just raw value

If input processed by different system

Just write this input value to singleton entity

and use this entity in your system which move cubes through singleton entity

and then again just get raw value from this singleton entity and pass into job

[wary ibex]

sounds good, thanks a lot

just another question, about performance, if you know what's going on here: https://github.com/Unity-Technologies/EntityComponentSystemSamples/blob/master/UnityPhysicsSamples/Assets/Demos/6. Use Cases/CharacterController/Scripts/CharacterControllerOneToManyInputSystem.cs

they read the singleton data and pass that to a component which all character controllers have. I was wondering why they do that in this sample instead of reading the singleton in the character controller system directly. Is it for performance purposes?

[storm ravine]

This is the same as I described

They have input system

which process input and store in singletone

and then some consumer use that

it's just sample that's all

They can do that (for example) if you have part of objects which should have one target

then you select other group and move them to other target

all depends on use case

[wary ibex]

yep but they dont use it directly in the character controller, they pass it further to a component. I was wondering why they do that. Would accessing the singleton in the character controller system directly be more costly than doing it through CharacterControllerInternalData?

I am assuming it doesnt affect performance other than perhaps delaying input change, but they did it in this way for just modularity purposes?

[storm ravine]

Read again what I wrote 🙂

It's just sample

There is no performance hit of using singleton data directly

[wary ibex]

alright, ty

[hollow sorrel]

an example of why you could want to do that is if you want AI to use the same character controllers, then you could have your player use actual input but have the AI have their input.movement etc be driven by their AI code

while still being able to use same controller code

[wary ibex]

Yeah I understand that I was just wondering if there were performance reasons in this sample

[storm ravine]

Not. And tbh this sample is bad sample at scale 🙂 On small amount of controllers it's doesn't matter as it will be anyway only one chunk and not valuable cache miss (as there is just small amount of iterations). But when you'll have 1000s of controllers then ISCD can be suitable , BUT again, it depend on case and how this shared data using, as if all controllers just use same values for all of them every frame - using data from input singleton directly will be more performant and less cache wasteful.

[wary ibex]

Well, in my case I do have 1000s of controllers

[storm ravine]

But you have same input

every time

for all of them

Then why you even want to store input on all of them 🙂

Of even on ISCD

It will be just unnecessary layer in-between

[willow plaza]

Is there a way to prevent the hybrid renderer from automatically converting MeshFilter and MeshRenderer?

is there a way to hide certain objects from a ConversionSystem?

[opaque ledge]

yeah, there is stop script i think

like, "Entity Convert (Stop)"

supposedly that gameobject and its children wont be converted

[willow plaza]

But I still want to convert some of the components...

I specifically want the Hybrid renderer only to stop converting

everything else I want to convert properly. Is that even possible?

[opaque ledge]

hmm, i dont think so, you could try to remove it after conversation

[willow plaza]

yeah, I guess it's not gonna work with the conversion systems

[hollow sorrel]

do WriteGroups work with conversion system?

maybe that's an option but dunno

[willow plaza]

hmmm...

in the past there was this copyTransform proxy component

is there still something like that?

Is there some kind of system that automatically syncs entity to GO transform?

or should I write my own system that does it?

[storm ravine]

Write conversion system which will run in GameObjectAfterConversionGroup and in this place remove RenderMesh, RenderBounds etc.

[willow plaza]

Write conversion system which will run in GameObjectAfterConversionGroup and in this place remove RenderMesh, RenderBounds etc.
@storm ravine ah, that's fine. I decided to go a different way.

more importantly this:

in the past there was this copyTransform proxy component
is there still something like that?
Is there some kind of system that automatically syncs entity to GO transform?
or should I write my own system that does it?

[storm ravine]

It's still here, only Proxies removed. CopyTransfromToGameObject component still here and you can add it in your IConverGameObjectToEntity

[willow plaza]

should I add it as object or data?

or HybridComponent?

What's the difference between these 3 anyway?

[hollow sorrel]

first is for just adding, componentdata is adding + setting

[storm ravine]

I'll leave it for your own self-education🙂 It works the same as before, look at source code for such type of questions 🙂 (spoiler struct CopyTransformToGameObject : IComponentData)

[willow plaza]

duh. Not even docs. You send me to source code? 😖

But I think I got it from the spoiler.

that being said I wish this kind of things were clarified properly in the docs ><

[storm ravine]

Yes. It's preview, and if you wont to use source code for information....well DOTS will be hard for you 😄

You always can open docs and read API reference

like this

https://docs.unity3d.com/Packages/com.unity.entities@0.11/api/Unity.Transforms.CopyTransformToGameObject.html?q=CopyTransformToGameObject

But just fall into definition in IDE - faster

[willow plaza]

thx teacher. Btw, regarding source code. Where can I find it?

do I need to dig into the packages folder in my ide/unity project window?

or is there a "comprehensive DOTS code compilation 2020"?

or is ctrl+clicking in my ide the commonly accepted way?

[storm ravine]

Ctrl + click fine (in Rider or VS with Resharper atleast)

But you always can open Packages folder in Project tab in Unity or in Ide in Packages or just directly in Library PackagesCache

[willow plaza]

I see

alright. Thanks for the info. I feel like I'm understanding that conversion workflow a bit more now.

Ah. one more question: I get this error in my custom conversion script:
InvalidOperationException: The entity does not exist

    public void Convert( Entity entity, EntityManager dstManager, GameObjectConversionSystem conversionSystem )
    {
        conversionSystem.AddHybridComponent( animator );
        
        dstManager.AddComponentObject( entity, animator.gameObject );
        dstManager.AddComponentData( entity, new CopyTransformToGameObject() );
    }

I assume it's because the entity doesn't exist at that point? How can I make sure that it exists?

[storm ravine]

Are you sure error points to this? To which exact row it points?

[willow plaza]

I couldn't find it pointing to my script

mostly points to conversion systems and other stuff too long to paste here.

InvalidOperationException: The entity does not exist
Unity.Entities.EntityComponentStore.AssertCanAddComponent (Unity.Entities.Entity entity, Unity.Entities.ComponentType componentType) (at Library/PackageCache/com.unity.entities@0.11.1-preview.4/Unity.Entities/EntityComponentStoreDebug.cs:301)
Unity.Entities.EntityDataAccess.AddComponent (Unity.Entities.Entity entity, Unity.Entities.ComponentType componentType) (at Library/PackageCache/com.unity.entities@0.11.1-preview.4/Unity.Entities/EntityDataAccess.cs:530)

[storm ravine]

Your system usually will be in a middle of stack trace

[willow plaza]

okay, I'll try to find it

ah

[storm ravine]

Which workflow you're using?

[willow plaza]

It's not a custom system though

[storm ravine]

Inject or Destroy?

[willow plaza]

IConvertGameObjectToEntity

and inject and destroy yes

[storm ravine]

?

It can be inject OR destroy

[willow plaza]

lol convert and destroy I mean

sorry it's almost 4 am here, and I'm still trying to dig into ecs ><

guess I'll just drop that CopyTransformToGameObject charade and create my own system to update the transform each frame😑

[storm ravine]

It's not necessary as CopyTransformToGameObject works.

Well if you Convert And Destroy

What the point of CopyTransformToGameObject then

If GO will be destroyed

CopyTransformToGameObject suitable for Convert And Inject or if you manually create entity which will affect some GO transform.

[willow plaza]

I have this setup Paren GO with animator and some other components I don't want destroyed, child GO with convert and destroy and this custom converter component to link the animator in the entity.

And I wanted this entity to control the movement of my parent GO.

basically I want a character that is mostly controlled by ecs systems, but has an animated model that is synced to it's position. I wonder why it's so hard to achieve...

Maybe I'll just create a entity from scratch on the same object...

[storm ravine]

Your setup is wrong here a bit 🙂

If you remove AddHybridComponent here

it will work

[willow plaza]

then how am I gonna access it from systems?

[storm ravine]

Or replace it to AddComponentObject

As AddHybridComponent is for things when you fully convert GO to entity with it's components

It will create hidden companion GO for storing MB components

but they wouldn't appear in hierarchy

and will behave "like" class (not struct) IComponentData with main thread restriction

[willow plaza]

AddComponentObject(animator) seems to work. But I still get the error.

I assume that's because I don't actually have an entity representation of the parent object...

[storm ravine]

Your setup a bit weird. Why just not use Convert And Inject then

[willow plaza]

because then I have 2 renderers. The hybrid one and the regular

[storm ravine]

And just clear RM

[willow plaza]

EM?

aah

[storm ravine]

RM was typo

[willow plaza]

I guess I'll try that

tomorrow

btw, this seems to work to some degree, but the GO transform is not being updated:

    public void Convert( Entity entity, EntityManager dstManager, GameObjectConversionSystem conversionSystem )
    {
        dstManager.AddComponentObject( entity, animator );

        var e = dstManager.CreateEntity();
        dstManager.AddComponentObject( e, animator.gameObject );
        dstManager.AddComponentData( e, new Translation() );
        dstManager.AddComponentData( e, new CopyTransformToGameObject() );
    }

perhaps because of the animator...

[storm ravine]

Yes because CopyTransformToGameObject require to be on entity which is injected GO

[willow plaza]

makes sense

[storm ravine]

Like you have GO you convert and inject it

and then it will synch

[willow plaza]

Anyhow. I've gotta sleep, but if you have any good advices to share, I'll read them in the morning! Thanks in advance!

[storm ravine]

https://gametorrahod.com/game-object-conversion-and-subscene/

Sirawat wrote good article for newcomers in conversion workflow

If you don't want to dig in to sources

read this

Last question

You want your GO stay alive only because of animator?

[storm ravine]

If yes then you should use Convert and Inject. If you don't want to remove RenderMesh just put your GO with animator\mesh renderer in to dummy parent with Convert and Inject and CopyTransformToGameObject

[tawdry tree]

@willow plaza You could have CopyTransformToGameObject on the parent, and use a simple "MatchOtherEntityTransform" system to match position (and/or rotation/scale) with the child.

[warm panther]

When is it advisable to use a DynamicBuffer vs. a FixedList in a ComponentData?

(space considerations aside)

[safe lintel]

@willow plaza i believe CopyTransformToGameObject requires a LocalToWorld, it doesnt directly use translation.

[zinc plinth]

Translation, Rotation, Scale and all of those transform components are just for the user to use; the transform systems will then translate these value into the LTW/LTP matrices

[hollow sorrel]

@warm panther imo main thing is to convey intent
with a fixedlist you know it's going to be a fixed size and is always located in the component chunk

with dynamicbuffer you can still have it be in the chunk at a fixed size with buffercapacity, but you're able to go over this limit and then it'll automatically copy the array outside of the chunk

so basically dynamicbuffer can do more but just like with arrays vs lists, you could still use the simpler one if you know you're only going to use it for that

[willow plaza]

@storm ravine @tawdry tree @safe lintel thanks for the input.

@storm ravine and I already read that article through and through twice actually, although there were a few things I didn't understand due to the language. But as I grew to understand gameobject conversion more, I feel like I understand that article better too.

[mint iron]

updated events package finally: https://github.com/jeffvella/UnityEcsEvents to latest unity package version. the example project still needs work though.

[amber flicker]

I have an entity in conversion world (created via createAdditionalEntity) that I'd like to find the matching of in the editor world. Anyone know the right way to go about this? There's an EntityGUID component but value seems to be per-gameobject not per entity. (Obviously I could add a component with a unique hash but I'd like to avoid that and have to think the mapping must exist somewhere)

[zinc plinth]

wouldn't event conveyed by entities be super detrimental to ecs performance ?

because that could be alot of created/deleted entities

[mint iron]

no its pretty damn fast. there are like 100 tests in there some perf tests comparing some pretty high volumes. Having said that i probably wouldn't use the MonoBehavior routing part for main gameplay just UI interaction.

[zinc plinth]

huuh

ho this is third-party I didn't see :o

[willow plaza]

Alright, here is the set up I ended up with. Seems to be the best solution out of the options I tried:
Parent GO has only Transform, ConvertToEntity with inject and a custom proxy component. The child GO carries all of the monobehaviour components that I don't want/can't be converted to entity.
This way only the transform, and the components that I specified are carried over to the entity version. No unnecessary clutter from the automatic conversion systems like RenderMesh and stuff.

Here's the very simple custom proxy script:

public class GameObjectRendererProxy : MonoBehaviour, IConvertGameObjectToEntity
{
    [SerializeField] private Animator animator;
    private void Start()
    {
        if (!animator)
            animator = GetComponentInChildren<Animator>();
    }
    public void Convert( Entity entity, EntityManager dstManager, GameObjectConversionSystem conversionSystem )
    {
        dstManager.AddComponentData( entity, new CopyTransformToGameObject() );

        ///add mono components to access from systems
        dstManager.AddComponentObject( entity, animator );
    }
}

I wonder if everyone else is doing it the same way and it was something extremely simple that took me half a day to figure out? 😄

[tight blade]

what is the general difference between Component and ComponentData

**okay nevermind all that that was a dumb question

[tight blade]

a better question, can you add authoring components in code, or do you have to just duplicate all their logic? Id really like to programatically set up physicsbodies for entities when I add my custom authoring script, but the physicsbody set up internal logic is all tied up in the convert to entity logic and Id really rather not muck around with that.

Id prefer to just use the authoring component so that if I upgrade the unity physics or entities package and it changes the way the convert to entity process works it doesnt break everything :/

[hollow sorrel]

@tight blade you mean you want physicsbody to do its conversion and then you modify the resulting components?

[tight blade]

I mean I want to set up the inputs to the physicsbody authoring component in code

[hollow sorrel]

ah

what is the use case?

[tight blade]

edit: simplified
basically, Im setting up two objects which are attached to each other via a fixed joint, and I want to specify the combined mass of both of them and a ratio of mass between them (among other things), and have a script work out the rest without me having to manually set up all those things

[hollow sorrel]

mmm

not sure what that means but if you really want to, adding/modifying an authoring behaviour to the gameobject should work as long as it's before conversion

though if you're doing this at runtime then ideally you'd want to skip conversion altogether

[tight blade]

how would I know it it was before conversion? is there like a "before convert" function I can override?

[hollow sorrel]

there's a beforeconversiongroup if you wanna do this in a system

@grand plover is this a dots question

[tight blade]

ruuude

[hollow sorrel]

but yea still not sure if i understand right but i think skipping the whole authoring level would be better, all physicsbody really does is add a couple of basic components with given values

should be able to just modify those components directly

[tight blade]

gotcha, so its basically "no, you have to duplicate the logic" if I want to do it at conversion time?

I mean that's a fine answer and at least I can resign myself to it knowing I looked into the alternative

[hollow sorrel]

not sure what logic you mean you'd be duplicating

[glacial bolt]

@grand plover Keep it in the relevant channel and have some patience.

[tight blade]

I actually havent looked up what is involved, I just know that they have changed the components that the physicsbody authoring component expands into a few times. If they were to change it in the future, my code is fragile and would not respond to that change, because rather than using the authoring component logic, I'm duplicating their current implementation of what the authoring component does with those inputs

if they added, for instance, a PhysicsIntertiaTensor component that is generated from the authoring component

well, if I used the authoring component that change would automatically apply when I upgraded

as opposed to duplicating the way they decompose the authoring component as of physics 0.4.0, entities 0.11.1

[hollow sorrel]

ah i see

[tight blade]

again, is my life over if I have to accept some fragile code? no.

[hollow sorrel]

despite that i think trying to force using the authoring behaviour is still more trouble than worth when you could just add your own conversionsystem that runs after, and sets the component values to your liking
it'd work even if they change their authoring behaviour since it runs directly on the components, altho if they change those then yea

and physicsbody authoring doesn't do much, no fancy math, just adds a couple components

[tight blade]

yeah. I mean just library wise, authoring components are basically wrappers around adding components. I just wish that wrapper was exposed to code

I can duplicate the current wrapper logic, if I must.

[hollow sorrel]

yea the convo earlier today about conversion was basically about that too i think, unity does an automatic conversion on meshrenderers if you're using hybrid renderer and i don't think you can just replace it with your own conversion or change the existing one

[tight blade]

yeesh, man I cant even find where in the code they actually create or add these components. It seems split up all over the place

[hollow sorrel]

you can select in packages when you search
dunno how familiar you are with the conversion system but most of the time the authoring behaviour just contains data and the conversion system does the actual conversion, so you'd have to look at PhysicsBodyConversionSystem in this case

[tight blade]

my exposure is just making monobehaviors with IConvertGameObjectToEntity

I know pretty much nothing else

[hollow sorrel]

yea that's the basic way
the other way is to make a conversionsystem that implements the IConvert so sometimes you can do stuff more efficiently if they're the same for all converted types

e.g. rather than each seperate monobehaviour doing its own expensive calculations despite being the same every time, it'd just be done once in the system and passed to each

[tight blade]

makes sense. thanks, thats a very useful explanation starting point

where did you run that search, by the way?
https://discordapp.com/channels/489222168727519232/497874303463850004/730267503242248244

[hollow sorrel]

in project window

[tight blade]

oh, nice! hey thanks for all the help

[hollow sorrel]

np

also protip if you go in preferences and tick generate csproj for Registry packages
under external tools
autocomplete and shit should actually work since otherwise visual studio just thinks you're opening a single standalone file at a time

and you get to F12 on any unity component that's in a package and directly jump to source with unity's comments and stuff intact unlike if you let vs decompile it

[tight blade]

ohhh sick

[spark glade]

Well this is a new one...

Parameter name: obj
  at Unity.Entities.ManagedObjectRemap.RemapEntityReferences (System.Object& obj, Unity.Entities.EntityRemapUtility+EntityRemapInfo* entityRemapInfo) [0x00000] in <00000000000000000000000000000000>:0
  at Unity.Entities.ManagedComponentStore.PatchEntities (Unity.Entities.Archetype* archetype, Unity.Entities.Chunk* chunk, System.Int32 entityCount, Unity.Entities.EntityRemapUtility+EntityRemapInfo* remapping) [0x00000] in <00000000000000000000000000000000>:0
  at Unity.Entities.ManagedComponentStore.Playback (Unity.Entities.ManagedDeferredCommands& managedDeferredCommands) [0x00000] in <00000000000000000000000000000000>:0
  at Unity.Entities.EntityDataAccess.FillSortedArchetypeArray (Unity.Entities.ComponentTypeInArchetype* dst, Unity.Entities.ComponentType* requiredComponents, System.Int32 count) [0x00000] in <00000000000000000000000000000000>:0
  at Unity.Entities.Conversion.GameObjectConversionMappingSystem.CreateDstEntity (UnityEngine.Obj

ArgumentNullException: Value cannot be null.
Parameter name: obj
  at Unity.Entities.ManagedObjectRemap.RemapEntityReferences (System.Object& obj, Unity.Entities.EntityRemapUtility+EntityRemapInfo* entityRemapInfo) [0x00000] in <00000000000000000000000000000000>:0
  at Unity.Entities.ManagedComponentStore.PatchEntities (Unity.Entities.Archetype* archetype, Unity.Entities.Chunk* chunk, System.Int32 entityCount, Unity.Entities.EntityRemapUtility+EntityRemapInfo* remapping) [0x00000] in <00000000000000000000000000000000>:0
  at Unity.Entities.ManagedComponentStore.Playback (Unity.Entities.ManagedDeferredCommands& managedDeferredCommands) [0x00000] in <00000000000000000000000000000000>:0
  at Unity.Entities.EntityDataAccess.FillSortedArchetypeArray (Unity.Entities.ComponentTypeInArchetype* dst, Unity.Entities.ComponentType* requiredComponents, System.Int32 count) [0x00000] in <00000000000000000000000000000000>:0
  at Unity.Entities.ComponentSystemBase.HasSingleton[T] () [0x00000] in <000000000000000000000000

Error when loading 'AsyncLoadSceneJob(jar:file:///data/app/com.legioncommander-wHk8pzUNPbviiUMywse5ag==/base.apk!/assets/SubScenes/987d636b4216f478daa2ad6112bccebc.0.entities)': System.IndexOutOfRangeException: Index was outside the bounds of the array.
  at Unity.Entities.ManagedComponentStore.PatchEntities (Unity.Entities.Archetype* archetype, Unity.Entities.Chunk* chunk, System.Int32 entityCount, Unity.Entities.EntityRemapUtility+EntityRemapInfo* remapping) [0x00000] in <00000000000000000000000000000000>:0
  at Unity.Entities.ManagedComponentStore.Playback (Unity.Entities.ManagedDeferredCommands& managedDeferredCommands) [0x00000] in <00000000000000000000000000000000>:0
  at Unity.Entities.EntityManager+EntityManagerDebug..ctor (Unity.Entities.EntityManager entityManager) [0x00000] in <00000000000000000000000000000000>:0
  at Unity.Entities.EntityManager+EntityManagerDebug..ctor (Unity.Entities.EntityManager entityManager) [0x00000] in <00000000000000000000000000000000>:0
  at Unity.Scenes.SceneSectio

on "com.unity.entities": "0.11.0-preview.7"

Anyone seen something like this before?

It's a relatively simple subscene

Works in the editor, crashes on Android

[opaque ledge]

something about build settings

i never did subscene stuff, but in order to include them in your builds you have to do extra stuff

check platforms package doc

[spark glade]

oh wow, I figured it out

@opaque ledge that's a typical cause, but not in this case

[opaque ledge]

alright, well glad you figured it out 😄

[spark glade]

Issue was my "mainmenu subscene" had a light in it.

which is an actual error in 0.11 I guess (was fine in ≈0.6)

and that (naturally) leaves ecs in a fucked up state when loading subsequent scenes

[opaque ledge]

hmm, how can it have light and your subscene can work in editor ? i thought lights arent supported yet in subscenes

[spark glade]

dunno 🤷

🤷

[pulsar jay]

Where would I usually put "helper" functions in ECS. For example in the case of my grid CellToWorld(int2 cell)

[spark glade]

ah, dang it...

[pulsar jay]

Should it be part of a system?

[spark glade]

If it's used across multiple systems I put those things into Util classes.

[pulsar jay]

Like GridUtils?

[spark glade]

yeah sure

Everything has to be static iirc

[pulsar jay]

I usually have these kinds of methods a lot. But maybe its because im still thinking to object oriented.

[spark glade]

I think you're fine

[pulsar jay]

so I guess I would always have to pass the grid into each method then

it feels like a slight drawback to me especially to replace properties like that:

public Vector3 Up
{
get { return Grid.Swizzle(this.CellSwizzle, Vector3.forward); }
}

With sth like:
public static GetUpVector(Grid grid) ...

[spark glade]

I don't have a lot of context, but you can still do stuff liek this:

    public struct GridThingy : IComponentData {
        public int CellSwizzle;

        public float3 Up {
            get { return GridUtils.Swizzle(this.CellSwizzle, Vector3.forward); }
        }
    }

[pulsar jay]

I guess its more about how it should be in ECS

Sure can I still add properties to a grid component but should I? I could even add the CellToWorld method to it

But I think that would contradict the separation of data and logic

Just trying to figure out if there are any "standards" yet. Good to know you use Util classes. Would be interesting if others have the same approach

[willow plaza]

Anyone had any success with integrating navmesh or any other pathfinding system? I was trying to get this package to work, but I keep on getting errors, possibly because of version differences...
https://openupm.com/packages/com.reese.nav/

[storm ravine]

"Write your own" (C) EIZENHORN

[willow plaza]

hahah I guess I'll have to do that. Although I don't feel confident at all...

[amber flicker]

There’s actually a good thread on the forums fairly recently on this

[willow plaza]

When I see some packages on github I feel like it's a completely different level from me. What's with all that technical and complex vocabulary... ><

[amber flicker]

Still stuck on getting a reference to an entity (via CreateAdditionalEntity) in the Editor world upon conversion. Anyone tackled this?

[wary ibex]

This is a system to gather user input and save it in a singleton. But it saves the state directly, given the input, instead of just the input, which is the calculated position of the cursor (it's not the mouse cursor, it's just a 3d position).
I don't like this approach of getting the singleton just to increment the position value, so is it better to store the current position in this system instead? Or is this fine?

(ignore the 1st assignment there, it should just be Entity singleton;)

[mint iron]

ehh its fine, GetComponent isn't free but its probably insignificant here, if the system time is getting above 0.05 then maybe investigate, otherwise move on.

[wary ibex]

thanks!

[deft stump]

so platforms 0.6.0-preview 1 has has some breaking changes huh

[north bay]

There's a new platforms package? What's new?

[deft stump]

dunno

I was about to try it

but then I got missing namespaces

[odd cipher]

I just spent like 2 hours trying to fix some weird lag I didn't have before with my Jobs but then realized it was because I had turned off Burst Compilation

[opaque ledge]

😛

[safe lintel]

is anyone here is actually using dspgraph for their audio in something more complex than just a test project?

[opaque ledge]

was too low level stuff for me, so no for me

yeah mrfragger, we need to wait for next entities package

[mint iron]

i doubt it, last i tried dspgraph it was half broken, seemed like an extreme alpha.

[wary ibex]

I'm having a bit of a problem with transform scaling and RenderMesh. If I leave my transform scale unchanged (1,1,1), the mesh does not seem to render at all. And the collider is not matching the mesh. I tried scaling the mesh (vertices * scale) and leaving the transform scale (1,1,1), but that didn't work either.

Has anyone ever had something similar happen?

[opaque ledge]

collider is whole another thing, its a different component

[wary ibex]

I am aware, I tried setting the collider size the same as the transform scale but that didn't work as intended

for (int i = 0; i < x; i++) {
    for (int j = 0; j < y; j++) {
        Entity bar = World.EntityManager.CreateEntity(barArchetype);
        float3 position = new float3(i * (barWidth + barDistance), 0, j * (barWidth + barDistance));
        float3 scale = new float3(barWidth, 1, barWidth);

        EntityManager.SetSharedComponentData(bar, new RenderMesh() {
            mesh = barMesh,
            material = barMaterial
        });

        EntityManager.SetComponentData(bar, new Translation() {
            Value = position
        });

        EntityManager.SetComponentData(bar, new NonUniformScale() {
            Value = scale
        });

        PhysicsCollider collider = new PhysicsCollider() {
            Value = BoxCollider.Create(new BoxGeometry() {
                Center = position,
                Orientation = quaternion.identity,
                Size = scale,
                BevelRadius = 0.01f
            })
        };

        EntityManager.SetComponentData(bar, collider);

...```

Can anyone find anything wrong here?

I just want the collider to align with the mesh

Alright, the problem was the Center of the collider is local and not in world space, obviously 😐

[tawdry tree]

Heads up: There is a Compound collider if you want to reduce Entity count and still have a complex collider built from multiple basic shapes

[frigid needle]

@tawdry tree

whats faster

using 2 colliders

or using 1 collider and doing 1 collidercast only WHEN i need to check for the other collisions?

[tawdry tree]

What's the use case here? Why are collision happening? Is this every frame? Are you doing it manually? Or letting the Physics package systems do it (as part of normal collisions)?

Also: Have you tried whichever is simplest?
I suggest doing that.
Then, if you test that and see that perf is unacceptable, only then should you look at more complex alternatives.

[frigid needle]

let me show you

easily explained with a video

[tawdry tree]

Most likely my advice will not change - go for whatever is the simplest.

[frigid needle]

1 collider for landing in a single lilypad and stopping it AND the frog

WHEN I land I do a collider cast

and sweep across the lane

[tawdry tree]

This smells like premature optimization.
As in: Using resources to optimize before you know if you even need to optimize, and without

[frigid needle]

and stop all the lilypads

i have a third question

[tawdry tree]

Resources here being mostly time, but also potentially creating worse(harder to maintain) code

[frigid needle]

so

like

either compaundcolliders

collidercast like im doing right now

does

will it be fastewr to use IsharedComponentData

does it make sense in this case?

is ISCD used for this?

my idea is just

have the same SCD for the whole lane

and when I land i can just change the SCD from the lilypad I landed

and at runtime I would stop all the other lilypads

but honestly I think doing the ColliderCast should eb the easiest way

[tawdry tree]

For something this simple, with this few elements, do what makes for the simplest code.

[frigid needle]

makes sense, doesnt really matter because most likely im just gonna be fighting for probably nanoseconds here

since there are only l;ike 64 lilypads at any given time

[tawdry tree]

Collidercast, or a couple of raycasts (center of frog + each "corner" of it's collision area") looks to be a good method for what you're doing

[mint iron]

anyone figured out how to use the animation package yet ? 😄

[spark glade]

Virtually no one is down to sink time into it without the examples 😢

[willow plaza]

There are examples though.

[gusty comet]

High! I heard around that one of the advantages of the DOTS is that the BURST compiler uses a lot of SIMDI instructions. Does that mean that if conditions in systems are going bog SIMDI instructions down?

[vagrant surge]

@gusty comet dont worry unless you are heavily tryharding

[gusty comet]

I'm tryharding.

[vagrant surge]

most of the simd burst uses is the AoS type of simd, where a vec4 parameter is basically a vec4 simd vector

as far as i know its basically just the autovectorizer from llvm

tho with hints so it can do its work well

[gusty comet]

Gotcha, guess I wont bother doing much branchless programming

[vagrant surge]

going as far as to try branchless is just when you are going absolutely ham on the tryharding

making sure your chunks are well filled and your data is as minimal as you can get (to save bandwidth) is generally more important

also remember that many branches can be filtered at the archetype level

instead of having a bIsStatic, you can have a Static component and then filter for it

[dull copper]

@gusty comet if your use case lets you use it, there's math.select which you can use if you need something more optimized

(on the new mathematics lib)

https://docs.unity3d.com/Packages/com.unity.mathematics@1.1/api/Unity.Mathematics.math.html#Unity_Mathematics_math_select_Unity_Mathematics_float4_Unity_Mathematics_float4_System_Boolean_

more info about this here on this post: https://forum.unity.com/threads/math-selects-performance-vs-inline-if.532282/#post-3505501

[vagrant surge]

there is also the important distinction beetween uniform branches and vector ones

for vector ones, yeah def math.select

but uniform branches (scalar) might just be better to leave the branch predictor do its wokr

[dull copper]

that's pretty much what the forum post said

[warm panther]

I know Burst doesn't do exceptions yet, but try {} finally {} has been the defining feeling for my development work recently. 😛

for vector ones, yeah def math.select
@vagrant surge Is math.select a branchless select?

I suppose it is.

[vagrant surge]

yes

[warm panther]

Cool. 🙂

If I have a FixedList64<float3> I can assume the data is packed tightly for SIMD purposes then? Is there a way to optimize a math.select over these elements (without indexing and thus likely recalculating the address for each element?)

Or is this premature musing about optimization possibilities...

I might expect Burst to optimize this for me at some point.

Because I realized I could drastically optimize my distance sorting calculations, which can at times be o(mn²), with m averaging 5 to 10, and n being 1000-5000.

[wary ibex]

Can we really not use unity's Entities package outside of unity? that's so depressing

[willow plaza]

I think I'll need some help now, ppl. I'm getting this error message, but the suggestion seems to end abruptly leaving me with no solution...

InvalidOperationException: The previously scheduled job NavSurfaceSystem:<>c__DisplayClass_NavSurfaceTrackingJob reads from the NativeArray <>c__DisplayClass_NavSurfaceTrackingJob.JobData.physicsWorld.DynamicsWorld.m_MotionDatas. You are trying to schedule a new job Solver:ParallelApplyGravityAndCopyInputVelocitiesJob, which writes to the same NativeArray (via ParallelApplyGravityAndCopyInputVelocitiesJob.MotionDatas). To guarantee safety, you must include NavSurfaceSystem:<>c__DisplayClass_NavSurfaceTrackingJob as a dependency of t

What is "t"?

[vagrant surge]

@wary ibex well, there are alternatives

you have flecs and entt for cpp which work amazing (flecs is very similar to unity ecs)

Entitas also works standalone for C#

other languages have others

[deft stump]

remember that ecs is a very old architecture

unity just re-popularized it because PERFORMAAAAANCE

[willow plaza]

Anyone has a clue why this simple plane is not getting a RenderMesh when it's converted?

While the same simple cube does:

nvm, seems to be the Nav Surface authoring that does something...

[warm panther]

Feelsgoodman.jpg

[willow plaza]

I see many people use LocalToWorld instead of Translation component. Is it more performant or something?

I understand that Translation is kind of a proxy to LTW, but how much overhead does it produce? Is it something I should worry about and change all of my code to use LocalToWorld instead?

[warm panther]

I need the Forward vector. 🙂

It has cached precalculated vectors and I also use it for the matrix transform for my fudged inertia tensors.

[willow plaza]

Ah. I thought Forward and co were in Translation? Strange...

Perhaps in the past...

[mint iron]

@warm panther regarding your SIMD questions; its mostly based on the types used, if you use bool4, float4 int4 and your structure is set out linearly then there is a good chance it will be vectorized. Its best to isolate the code in question in a job that you can easily find in the burst inspector and read the ASM to figure out if its working. The docs have an example here https://docs.unity3d.com/Packages/com.unity.burst@1.3/manual/index.html#loop-vectorization and there is a more detailed presentation here https://www.slideshare.net/unity3d/intrinsics-lowlevel-engine-development-with-burst but you should be able to get the idea from comparing float3 arrays against float4 arrays. Also here's an example of mask/compress https://github.com/jeffvella/NativeOctree/blob/4032420b842dfc7808c0643d8d94c6a519f242e7/Assets/Octree/NativeOctreeRangeQuery.cs#L60

[willow plaza]

Or I just have false memories about Translate... 😄

[warm panther]

Translation contains only one field, Value (float3)

Rotation contains only one field, Value (quaternion)

[willow plaza]

Yeah, I've jut checked it in the docs. But I just have that memory dated more than 1 year ago, that it had more fields...

From my memory it was like Transform just a struct...

[halcyon plume]

qq everyone

how to use particals in ecs?

and animator

and other things wich not ecs

[willow plaza]

hybrid approach.

you exchange data and callbacks between ecs and non ecs systems

[halcyon plume]

Are there any examples?

For example, I have a character. How can I make him an animation?

[deft stump]

just add the animation component like a normal go.

once you convert it to ecs, and inspect its components, you'll see it holds a ref to the animation component.

[halcyon plume]

???

[willow plaza]

Are there any examples?
@halcyon plume there aren't any decent examples of how to set it up. I had that problem myself. Took me several days to figure it out.

I ended up having a character base GO that is convert and injected to entity. As it's child I have all the non ecs gameobjects and components like animator and skinned mesh renderer. and authoring component on the character base injects copyTransform and animator as a componentObject into the entity to be controlled from systems.

It was really such a simple setup but I couldn't wrap my head how to do it and couldn't find any updated tutorials that demonstrate it.

[pulsar jay]

Is there any good authoring workflow besides using conversion? I am using entities in the editor and would like to edit some of their values. ATM most of it is managed through a custom editor creating/updating/destroying the entities but this workflow does produce problems when mutliple custom editors are required

[mint iron]

im confused, you're using entities for non-runtime scripts?

[safe lintel]

@willow plaza translation is local space(with a parent, acts same as ltw without a parent), localtoworld is the world space, the TransformSystem in the Entities docs contains a far better description than I can hope to explain

just a note, dynamic physics entities will use translation and rotation over localtoworld(also ignore other transform system components)

[pulsar jay]

@mint iron exactly. As my tilemap data is loaded from scriptable objects anyway it does not make sense to construct it from gameobjects in edit mode and entitis only at runtime

[willow plaza]

can Unity.Mathematics.Random be used in jobs?

[opaque ledge]

yes

[willow plaza]

thanks!

[mint iron]

@pulsar jay interesting, i'm using the SubScene/LiveLink and its conversion for editor time setup that becomes BlobAsset in the SubScene at runtime.

[willow plaza]

is there any reason to create a native array of random values and pass them into a job vs calling random.next inside the job?

[amber flicker]

@mint iron & @pulsar jay I'm also doing stuff with livelink/edit-time. Current issue is trying to force conversion to run again for a particular gameobject. Irritatingly I think GameObjectConversionUtility.ConvertIncremental may do what I need (and used to) but I get an error that it expects the world to be empty... which I'm pretty sure is because Unity is automatically adding a 'WorldTime' entity to the conversion world. Either of you dealt with similar issues?

[pulsar jay]

@amber flicker I did not know about that yet but it seems to be exactly what I was looking for

I got my tilemap editing workflow to work now. But atm I have the problem of DefaultGameObjectInjectionWorld being null at some point. Either at the beginning of playmoder or in between editing and playmode

Unity just crashes 🙁

[amber flicker]

you probably want to avoid if you can - if you're working with SO's and it does what you need you may want to use the super handy but hard to find exists: conversionSystem.DeclareAssetDependency(gameObject, yourScriptableObject);

if you disable Burst and enable job debugger, you should get errors rather than crashes but yea - you need to call the lazy create method

[pulsar jay]

DeclareAssetDependency sound interesting. Will definitely see if that helps. Thx

[amber flicker]

it will trigger a re-conversion whenever the SO updates is the idea (though in practice doesn't happen instantly for me)

[mint iron]

yeah, its full of bugs i think at the moment, i have to be very careful about editor time state of BlobAssets because its trying to do all this black box magic voodoo. Unitys hacks on top of hacks to make it work.

[pulsar jay]

I didnt even think of using conversion worflow for scriptable objects yet. ATM my workflow is Custom Editor using publically assigned scriptable object in script and constructing the tilemap

[amber flicker]

it's frustrating because EditorApplication.QueuePlayerLoopUpdate(); works most of the time for me (i.e. running my systems at edit time) but it doesn't seem to trigger the LinkedEntity stuff (which inherits from ComponentSystem) - if I focus away and back to Unity, conversion happens instantly 😦

oh geez.. I just found something ugly in the packages but I think it's what I need to replicate: ```static class EditorUpdateUtility
{
#if UNITY_EDITOR
public static bool DidRequest = false;
public static void EditModeQueuePlayerLoopUpdate()
{
if (!Application.isPlaying && !DidRequest)
{
DidRequest = true;
EditorApplication.QueuePlayerLoopUpdate();
EditorApplication.update += EditorUpdate;
}
}

    static void EditorUpdate()
    {
        DidRequest = false;
        EditorApplication.update -= EditorUpdate;
        EditorApplication.QueuePlayerLoopUpdate();
    }

#else
public static void EditModeQueuePlayerLoopUpdate() {}
#endif
}```

[pulsar jay]

I am having a similar implementation

without the didrequest

@amber flicker Thx disabling burst helped preventing the crash. I still get a null reference exception with this though: World.DefaultGameObjectInjectionWorld.EntityManager
Any ideas?

[amber flicker]

if outside of subscenes you'll need DefaultWorldInitialization.DefaultLazyEditModeInitialize();

[pulsar jay]

yeah I am using this. I needed it to work during edit time at all

It seems like OnEnable and OnDisable is triggered during playmode change and DefaultGameObjectInjectionWorld does not exist during this time

[amber flicker]

don't really understand but you can call a method e.g. OnEnable or whenever you want that checks if a cached version the World exists - if not set it equal the above in edit mode, or DefaultGameObjectInjectionWorld if Application.isPlaying

[pulsar jay]

Playmode change does indeed trigger Disable, Enable, Disable, Enable on my Execute Always Monobehaviour. The middle 2 seem to be happening during the playmode switch where the world does not exist

[amber flicker]

beware of what happens with domain reload disabled too

[pulsar jay]

yeah will keep that in mind. It might even work better without domain reload 😉

I have been using ExecuteAlways alot but I only just figured out that OnEnable/Disable is triggered one additional time between playmode change. It seems like the whole scene is initialized and then destroyed again

Just tested it with a simple script. Is this really intended? I dont see any reason for this behaviour

[storm ravine]

is there any reason to create a native array of random values and pass them into a job vs calling random.next inside the job?
@willow plaza here you can find my explanation "why" with proofs and examples https://forum.unity.com/threads/solved-gen-random-number-in-job-execute-causes-hang.779987

[safe lintel]

are you using dspgraph for diplomacy is not an option, eizenhorn?

[opaque ledge]

probably not, probably something like "custom-graph"

[storm ravine]

No, we left audio at the end, and anyway it will be regular audio sources with our custom solution, as we don't need sound per unit or sort of. As we will build some smart merge tool which will combine areas of things and run for them 1-2-3 audio sources.

Like marching crowd can be represented as 3 audio sources with crowd march sounds mixed 🙂

[safe lintel]

individual sound per unit could be kinda amazing or a total cacophony 😅

[storm ravine]

Yes this is why we'll write own solution 🙂

[wary ibex]

InvalidOperationException: Process.query.__impl uses unsafe Pointers which is not allowed. Unsafe Pointers can lead to crashes and no safety against race conditions can be provided.```
Any ideas why I'm getting this?

https://hatebin.com/aeynwhfltg

it's thrown at line 51

I want to use IJob directly instead of Entities.ForEach because I think it will be much better to test the code this way. But I don't think I'm doing it right

[safe lintel]

replace EntityQuery in your Process job with the native array

basically get the native array from the query on the main thread, feed it into your job, use [DeallocateOnJobCompletion] with the nativearray

also not sure if you can do foreach, might need to make it a for loop

[wary ibex]

thanks, I'll try that

[frigid needle]

@willow plaza here you can find my explanation "why" with proofs and examples https://forum.unity.com/threads/solved-gen-random-number-in-job-execute-causes-hang.779987
@storm ravine true, also you won't be able to build your game if you have random.next inside your job

it doesnt warn you when just using the editor, only at build time

(honestly it should warn you the editor too)

[ocean cloud]

Hey guys, any idea why EntityQuery.CopyFromComponentDataArray does not change chunk's component type change version? Is this the intended behavior?

Updating Translation through CopyFromComponentDataArray does not update LocalToWorld in my project, from what I see the reason is the Translation's change version didn't change (LTW system filters out unchanged Translation versions)

[storm ravine]

@storm ravine true, also you won't be able to build your game if you have random.next inside your job
@frigid needle That's wrong. It works in build just fine we using it since beginning. Even if you just pass Unity.Mathematics.Random directly to job and will use it like random.NextFloat it will work, just random will be the same on all threads as it will use the same initial seed without taking in to account already called steps (if you use it in parallel, which you can see in my sample in thread linked above). You can even create random inside job and it will work just fine (with the same problem of similar random on multiple threads (depends on seed) ). This random designed exactly for working inside jobs and burst.

[storm ravine]

And fast, ugly written, simple proof that it works.

public class Randomizer : SystemBase
{
    [BurstCompile]
    public struct SomeJobWithRandomOutside : IJob
    {
        public            Random           random;
        public            NativeArray<float> Result;

        public void Execute()
        {
            Result[0] = random.NextFloat(0, 10f);
        }
    }

    [BurstCompile]
    public struct SomeJobWithRandomInside : IJob
    {
        public NativeArray<float> Result;

        public void Execute()
        {
            var randomInsideJob = new Random( 345345345);
            Result[0] = randomInsideJob.NextFloat(0, 10f);
        }
    }

    protected override void OnUpdate()
    {
        if (RandomShower._inst == null)
            return;

        var randomOutsideJob = new Random(345345345);
        var resultOutside = new NativeArray<float>(1, Allocator.TempJob);
        new SomeJobWithRandomOutside()
        {
            random = randomOutsideJob,
            Result = resultOutside
        }.Schedule().Complete();

        RandomShower._inst.createdOutsideJob.text = resultOutside[0].ToString();
        resultOutside.Dispose();
            
        var resultInside = new NativeArray<float>(1, Allocator.TempJob);
        new SomeJobWithRandomInside()
        {
            Result = resultInside
        }.Schedule().Complete();
        
        RandomShower._inst.createdInsideJob.text = resultInside[0].ToString();
        resultInside.Dispose();
    }
}

[warm panther]

How do I change a CollisionFilter on a Composite Collider?!

        public CollisionFilter Filter
        {
            get => m_Header.Filter;
            set
            {
                // Disallow changing the filter of composite types directly, since that is a combination of its children
                if(m_Header.CollisionType == CollisionType.Convex)
                {
                    m_Header.Version++;
                    m_Header.Filter = value;
                }
            }
        }

The code to set it literally silently fails.

Really cost me some time.

I'd be fine if I could just set a groupindex (even on the parent).

How does Groupindex work for compound colliders anyhow?

[tight blade]

To start a separate thread of conversation... is there any way to resize the individual panels on the entity debugger or is that behavior just broken in 0.4.0?

[warm panther]

I "solved" my problem by making the collider not compound 😛 Which is annoying, because now I need two copy jobs of velocity and translation/rotation to kinematic bodies for the other components of my collider. Also I need to make my main collider "force unique", but I guess that's acceptable.

[mint iron]

i think theres a memory leak lol

[balmy horizon]

By Golly!

[opaque ledge]

even with that, only %81 lol

[foggy tree]

Hi people, I have an issue, hope somebody can help. I have some 2 systems, one collect user input, and modifies a component, and the other has ChangeFilter for that component. The problem is that if the second one is executed with Schedule(), the ChangeFilter never stops being triggered, but if I execute it with Run(), it behaves as I expect. So my question is, Is this a bug or something? Which one is the actual expected behaviour?

[odd ridge]

say I have an entity with a Position component and a Velocity component. I want the Position component to be removed from the entity in 10 seconds, and the velocity component be removed in 5 seconds

how would I do that?

[spark glade]

You could have a system that decrements a lifetime per frame, somethint like myPositionLifetimeComponent.lifetime -= deltaTime.

Then you have another (or the same system) that deletes it when myPositionLifetimeComponent.lifetime < 0

I use this pattern in many places, i.e. to remove the "coins/gems" loot that appears out of killed enemies: https://youtu.be/upDWz-AFOys?t=10

[odd ridge]

@spark glade how do you call such systems?

and say I have 8 components that have a lifetime, do I have to create a distinct lifetime component for each of those components with a distinct system with each of those lifetime components with duplicate system code 8 times? would there be a way to code a single lifetime component and attach it to any component that needs a lifetime?

[opaque ledge]

if they are on same entity yeah

[willow plaza]

I've been looking through the physics docs and found this example where they use unsafe in onupdate definition. Anyone can a plain why?

using Unity.Entities;
using Unity.Transforms;
using Unity.Physics;
using Unity.Mathematics;
using UnityEngine;

public class AttractSystem : ComponentSystem
{
    public float3 center;
    public float maxDistanceSqrd;
    public float strength;

    protected override unsafe void OnUpdate()
    {
        Entities.ForEach(
            ( ref PhysicsVelocity velocity,
              ref Translation position,
              ref Rotation rotation) =>
            {
                float3 diff = center - position.Value;
                float distSqrd = math.lengthsq(diff);
                if (distSqrd < maxDistanceSqrd)
                {
                    // Alter linear velocity
                    velocity.Linear += strength * (diff / math.sqrt(distSqrd));
                }
            });
    }
};

https://docs.unity3d.com/Packages/com.unity.physics@0.4/manual/interacting_with_bodies.html

Also, how is that query(or how do you call it?) gonna work without .Run or .Schedule?

[opaque ledge]

this is ComponentSystem, which is the oldest system i believe, it automatically runs on main thread and crates garbage and such, they should be only be used for debugging or prototyping (was said so in their older manual)

[willow plaza]

Ah, didn't notice that it's a ComponentSystem...

[opaque ledge]

about unsafe, you use that for pointer stuff, i remember someone said if you remove unsafe it will not work properly even tho there wont be any compile error

[willow plaza]

I see. That might actually explain an issue I have atm...

But I don't see any pointers in that script... 🤔 Did they just add for no reason?

[ocean cloud]

maybe they forgot to remove it

What issue do you have atm?

[willow plaza]

I'm trying to use an implementation of navmesh pathfinding in ecs, but when I use it with physics components I get tons of errors related to memory leak and lack of deallocation of a native array or something...

that's the package btw: https://github.com/reeseschultz/ReeseUnityDemos

[ocean cloud]

Try enabling Jobs -> Leak Detection -> Full Stack Traces and dispose your arrays after they're done

[willow plaza]

The problem is that it's not my code, but the package that throws the error apparently.
Here're the first lines of the the first thrown error in that situation:

InvalidOperationException: The previously scheduled job NavSurfaceSystem:<>c__DisplayClass_NavSurfaceTrackingJob reads from the NativeArray <>c__DisplayClass_NavSurfaceTrackingJob.JobData.physicsWorld.DynamicsWorld.m_MotionDatas. You are trying to schedule a new job Solver:ParallelApplyGravityAndCopyInputVelocitiesJob, which writes to the same NativeArray (via ParallelApplyGravityAndCopyInputVelocitiesJob.MotionDatas). To guarantee safety, you must include NavSurfaceSystem:<>c__DisplayClass_NavSurfaceTrackingJob as a dependency of t
Unity.Jobs.LowLevel.Unsafe.JobsUtility.ScheduleParallelFor (Unity.Jobs.LowLevel.Unsafe.JobsUtility+JobScheduleParameters& parameters, System.Int32 arrayLength, System.Int32 innerloopBatchCount) (at <3dc54541a2574ac7826a004a212a4332>:0)

[ocean cloud]

hm.. it's hard when the errors are in package

[willow plaza]

Yeah, I've extracted it to try and modify the package code, but I can't figure out what the problem is.

Here's the system with the job that appears in the error: https://hatebin.com/ccacrwskuh

[sturdy wolf]

Sorry to detract any conversation but I have a question

How would you make entities interact with one another in ECS?
If i have 2 armies of NPCs fighting each other, how would i get each individual to know where their target is, fire a projectile, and then process the hit?

There doesn't seem to be any functionality regarding pointing out a specific entity as far as I can tell for ECS, unless I'm missing something
Similar to Total War where the soldiers would pick a rival individual and engage in combat with them

[willow plaza]

Same is with regular architecture, except you'll let the systems handle the interactions.

First some kind of ai system chooses targets for each entity, then it issues a movement order or something, making the movement system kick in and move the entities towards their targets.

then an attack system will handle the attack

you just have to get the mindset of systems processing everything that's going on in the game

entities are just containers for components, which hold data.

[mortal knot]

hey, i want to check if a new item i want to pick up is already in my list. the list is a scriptableobject in a class -> list <class>

public bool Contains(List<Class> list,Class class) // SO in class -> list<class>
    {
        foreach(Class item in list)
        {
            if(class.item.itemname == item.name) // i cant reach the scripting object
            {
                return true;
            }
        }return false;
    }```

cant reach the scripting object int this method. any ideas?

[sturdy wolf]

@willow plaza
I understand that but my question is more about pointing those targets
If I want entity A to attack the nearest enemy entity, how would it figure that out?

[willow plaza]

@mortal knot are you not in a wrong channel? It's dots related channel. 😄

[mortal knot]

wysystem recommended to put it in here

[willow plaza]

@sturdy wolf many ways, loop through all the entities and find the closest one, target the first entity that collides with a trigger collider or something. Completely depends on what you want your logic to be.

@mortal knot well, I guess he was wrong then. Unless you want to implement your inventory in dots related way. Should probably ask back in #💻┃code-beginner .

@sturdy wolf remember that in Entities.ForEach you can query the entity itself.

you can also query a separate native array of components or entities and check against it.

[sturdy wolf]

Ah, I get it now
Thanks

[deft stump]

weird

my shadergraph color isn't working right

no wait

it is working correctly

[wanton apex]

Hi,
I'm trying to implement a SphereCast utility function, but Unity crash every time i'm using it, so I don't know how to debug it. Does somebody can explain me the problem with my script?

         PhysicsCategoryTags belongTo, PhysicsCategoryTags collideWith,
         CollisionWorld collisionWorld,
         out NativeList<ColliderCastHit> e)
    {        


        var filter = new CollisionFilter()
        {
            BelongsTo = belongTo.Value,
            CollidesWith = collideWith.Value,
            GroupIndex = 0
        };

        SphereGeometry sphereGeometry = new SphereGeometry() { Center = float3.zero, Radius = radius };
        BlobAssetReference<Collider> sphereCollider = SphereCollider.Create(sphereGeometry, filter);

        ColliderCastInput input = new ColliderCastInput()
        {
            Collider = (Collider*)sphereCollider.GetUnsafePtr(),
            Orientation = quaternion.identity,
            Start = RayFrom,
            End = RayTo
        };

        e = new NativeList<ColliderCastHit>(Allocator.TempJob);

        ColliderCastHit hit = new ColliderCastHit();

        bool haveHit = collisionWorld.CastCollider(input, ref e);
        if (haveHit)
        {
         
            return true;
        }
        
        return false;

    }```

And here this is where I call it. I'm new with SystemBase, and not sure about how I have to capture the NativeList Variable

 protected override void OnUpdate()
    {
        ComponentDataFromEntity<LocalToWorld> ltw = GetComponentDataFromEntity<LocalToWorld>();
        ComponentDataFromEntity<PlayerTagComponent> players = GetComponentDataFromEntity<PlayerTagComponent>();
        var colWorld = collisionWorld;

        NativeList<ColliderCastHit> hits = new NativeList<ColliderCastHit>(Allocator.TempJob);
        var buffer = World.GetOrCreateSystem<EndPhysicsSimulationCommandBufferSystem>().CreateCommandBuffer();

        Entities.
            WithAll<IATagV2Component>().
            WithNativeDisableParallelForRestriction(buffer).
            WithNativeDisableParallelForRestriction(colWorld).
            WithNativeDisableParallelForRestriction(hits).
            WithReadOnly(ltw).
            WithReadOnly(players).
            ForEach((Entity entity, IAV2SensorComponent sensor, ref Translation tr, in IAV2AttackData attackData) =>
        {

            var e = Entity.Null;
            RaycastECS.OverlapSphere(tr.Value, tr.Value, sensor.detectionRadius, new Unity.Physics.Authoring.PhysicsCategoryTags { Value = ~0u }, sensor.detectionPhysicsTag, colWorld, out hits);
}).Run();// WithBurst().ScheduleParallel();

        hits.Dispose();

        World.GetOrCreateSystem<EndPhysicsSimulationCommandBufferSystem>().AddJobHandleForProducer(this.Dependency);
    }

[deft stump]

hrmmm

is there a way to like... "disable" an entity?

[wanton apex]

You can have a Component "DisabledTagComponent", and exclude entities with this tag in your systems, so they don't affect them.

In your queries have a Entities.WithNone<DisabledTagComponent>().Foreach()=>

[deft stump]

so anyone affected by that tag.
I can just remove the rendermesh component and make it seem like it's invisible.

alright

[wanton apex]

Ho your talking about rendering, I saw in documentation that Disable rendering is supported with the Hybrid Renderer V2, but not with the V1

[deft stump]

it must be something to be add on runtime I guess...

[wanton apex]

Yes it is

[safe lintel]

@wanton apex instead of creating a collider every time you spherecast, try storing one in ICD somewhere and using that as to cast with

[wanton apex]

I will try this, thx for feedback

[tight blade]

does anyone know how to set world rotation of an object? a lot of the answers are like 5 years old

[safe lintel]

set the localtoworld directly

@tight blade so

var ltw = new LocalToWorld
  {
    Value = float4x4.TRS(localToWorld.Position, myDesiredRotation, scale)
  };

[tight blade]

nice, okay awesome

let me try that

hmm, that seems to reset the location too

oh wait

I should be assigning it to the localToWorld.Value, not fully replacing the component

[safe lintel]

the entities documentation has an in depth explanation to how the transform system works

so if you have other components that feed into the localtoworld it might get overwritten

[tight blade]

I don't, this is a very simplistic set up

[safe lintel]

https://docs.unity3d.com/Packages/com.unity.entities@0.11/manual/transform_system.html

[odd ridge]

I want to write my own movement system and physics system in dots to get more performance. I need to read the height of the terrain to know where to place my entities that walk on it, how would you read the height of terrain in dots?

[safe lintel]

im not familiar with terrain but assuming its regular unityengine object stuff, just need to access it on the main thread and then pass it into your job like using any other stuff that requires mainthread access

[tight blade]

@safe lintel so, my assumption is that float4x4.TRS(localToWorld.Position, quaternion.identitiy, scale) would set that to have a world relative 0 rotation..., so it should face directly upward... would that be right?

[safe lintel]

eh I guess that depends what the how the model is setup

[mighty whale]

so hum i was using IJobForEach to run a job on a background thread but it is now deprecated, i searched a bit online but haven't found a clear example telling me how to rewrite this job with an up-to-date syntax...

the job looks like

namespace Systems {
    public class Movement : JobComponentSystem {
        private struct MovementJob: IJobForEach<Moving, PhysicsVelocity, Rotation> {
            public void Execute(ref Moving moving, ref PhysicsVelocity velocity, ref Rotation rotation) {
                // stuff to move the moving
            }
        }
        
        protected override JobHandle OnUpdate(JobHandle inputDeps) {
            MovementJob job = new MovementJob();
            return job.Schedule(this, inputDeps);
        }
    }
}```

so yeah if someone has a clue i'd be grateful to know

[odd ridge]

the new API uses Entities.ForEach

[mighty whale]

indeed i'm starting to read that, what i'm wondering now is among the bazillions of system class there is which should i use ?

the doc is not always clear about that :(

Like SystemBase vs JobComponentSystem for example

it seems to me that they are completely interchangeable but there has to be strong and weak points right ?

[mint iron]

You're supposed to just use SystemBase now. for everything.

[mighty whale]

Thanks, so I would do something like this for example ?

namespace Systems {
    public class Movement : SystemBase {
        protected override void OnUpdate() {
            Entities.ForEach(
                (ref Moving moving, ref PhysicsVelocity velocity, ref Rotation rotation) => {
                  // stuff to move the moving
                }
            ).ScheduleParallel();
        }
    }
}

[tight blade]

Would you guys mind terribly if I re asked my question from above? I've been working at this for hours and its really bumming me out. I'm trying to, in a system, reset an object's rotation so that it is world relative 0 (so I want to re-align the entity's translation axes with the world translation axes). This page about how LocalToWorld and rotation interact is really dense....

My situation should be the simplest case, too. I only have Rotation, LocalToWorld, and Translation components. Everything is uniform scale -- in fact the scale is 1,1,1

I just cant figure this out

[hollow sorrel]

@tight blade did the setting ltw directly suggestion not work?

[tight blade]

so, I set it as follows, and this did not work:
localToWorld.Value = float4x4.TRS(localToWorld.Position, quaternion.identity, new float3(1));

wait...

[hollow sorrel]

1. are you using ref for the ltw?
2. unity's transform system might overwrite it, make sure you update it after TransformSystemGroup

[tight blade]

ohhh thats interesting. I thought that that dependency would have been managed automatically by specifying ltw as a ref... no wait, thats if I specified it as "in".

how would I control that? Can I tag it with [UpdateAfter(typeof(TransformSystemGroup))] or something?

[hollow sorrel]

yea that should work

also yea unity handles job dependencies if you use entities.foreach, but if your system schedules first, then the jobsystem will execute yours first

[balmy horizon]

I'm about to get into ECS, and it seems like im also getting into DOTS. Does anyone have any tips or precautions before I go in?

[mint iron]

@balmy horizon check the pinned messages in this channel, and further down that list there's a link to the Copenhagen Unite youtube playlist which as a lot of good explanations in it (although some of the code itself will be out of date by now).

[tight blade]

I think I've managed it @hollow sorrel

its kind of hard to tell, but it seems to be holding steady

[hollow sorrel]

good to hear 👍

[tight blade]

😅 👍

[gusty comet]

Thats one major issue with dots in general. The constant rehashing of things utterly fractured the tutorial and documentation space

Heck even the official documentation is not up to date in some parts

[tight blade]

Picture an octopus entity connected to 8 arm entities by physics joints. If two octopus arms are close enough together, they can link together to hold a gun and pull the trigger. There can be many octopuses in the world. I'm designing a way to detect, in a system, whether or not two arms are close enough together for this condition to be true. For purposes of this discussion, assume octopuses may varying number of limbs, but usually around 8.

I have 3 candidate ideas -

1. use the common entityID (the octopus ID) as a shared component value. Then iterate through chunks and check proximity only against other arms in the same chunk, since the arms with the same octopus id would be in the same chunk (right?) Possible cons: lots of octpodes mean pretty small chunks. and in theory isnt it possible that an octopus's arms could be split onto multiple chunks?

2. Use the octopus ID as a shared component value, then when the system updates, run queries with .SetFilter to select the arms for each octupus and load them into arrays. then I guess do some processing against those arrays? I dont really know what iteration mechanisms I have at my disposal in this case.

3. give the octopus entity a buffer of children. then during the octopus system, walk through each of those children using the entity manager to get their translation components. if any are found to be close enough together, use the entity manager to walk to those children and somehow indicate that this condition is true so that during the arm system that fact can be used. This seems the least performant/ most random access.. although perhaps has the least unknowns

I guess a 4th option might involve raycasts during the ForEach(Arm) system

[gusty comet]

I think raycasts on that large a scale might be far too expensive

[tight blade]

yeah, same.

[safe lintel]

spatial hashmap like what boids uses?

and by boids i mean the boids sample in the ecs samples repo

[tight blade]

oh yeah? I haven't seen it. I'll go take a look now. "spatial hashmap" sounds like an interesting concept

[safe lintel]

its like you organize your world into a 3d grid, and then operate on entities on a per cell level, so they dont end up being compared to every single entity, just neighbours(or neighbors in neighboring cells)

[tight blade]

I see. So that sounds kind of halfway towards the chunk batching approach. cell batching would be better, but doesnt it still leave the risk that octopus arms would land in different batches? thats such a small risk I doubt it matters

[deft stump]

weird

the colors of my shadergraphed material is turning white instead of blue when instanciating

aaah

crap it's the directional light

[spark glade]

Oh man, I tried updating from 0.9.0-preview.6 to 0.11.1-preview.4 (and physics 0.3.2-preview to 0.4.0-preview.5 ) and everything went to shit again :/

My positioning system doesn't work anymore because now it seems to be overwritten by physics 🤔

As soon as I disable ExportPhysicsWorld things work again.

[spark glade]

Ok, so what's the correct approach to have a system that modifies PhysicsVelocity? Do I have to UpdateBefore(BuildPhysicsWorld) aa well as BuildPhysicsWorld.AddInputDependency(Dependency) ?

Seems to be the case: https://github.com/Unity-Technologies/EntityComponentSystemSamples/blob/d049e768b36b1fbaed6d124017ef053c5a5d2731/UnityPhysicsSamples/Assets/Demos/1. Hello World/1c. Conversion/Scripts/1c3. DOTS GravityWell/GravityWellSystem_DOTS.cs#L72

[hollow sorrel]

@spark glade afaik you shouldn't need the addinputdependency but yea physicsvelocity should be modified before buildphysicsworld

[spark glade]

Yeah, maybe the dependency isn't needed because they'd both touch physicsvelocity and that should be done automagically.

It probably shouldn't hurt though 🙏

So I'm more and more running into the issue of my systems (which I group by "game state") needing such kind of dependencies. I.e. i have two game states. Say:

1. Before the Battle starts (things like drag'n'drop units on the battlefield)
2. Battle has started (the actual battle simulation)

So I set up two groups

• SimulationSystemGroup (the build in one)
  • GameSetupSimulationSystemGroup (custom)
  • GameRuntimeSimulationSystemGroup (custom)

So now I have a system in GameRuntimeSimulationSystemGroup than needs to UpdateBefore say BuildPhysicsWorld.

Since they aren't in the same group, the dependency resolver will ignore it.

Looks something like this:

This attribute can only order systems that are children of the same ComponentSystemGroup.
Make sure that both systems are in the same parent group with [UpdateInGroup(typeof(Game.Systems.Simulation.Runtime.GameRuntimeSimulationSystemGroup)].```

Which makes perfect sense.

Now... how would I add this necessary depdencency?

[hollow sorrel]

you'd just do updatebefore(gameruntimesimulationsystemgroup)

update before/after the entire group

[spark glade]

Have the entire group UpdateBefore(BuildPhysicsWorld) doesn't seem like a good solution.

[hollow sorrel]

ah i see what you mean

[spark glade]

yeah it'll work I guess

But I can easily see a case where I need some dependency chain that will be impossible

[hollow sorrel]

you'd need to have two groups if you need a before and after

[spark glade]

So I guess I could flatten the whole thing out.

And build my on "Grouping" system.

[hollow sorrel]

sure you could do that as well

[spark glade]

because i kind of don't use it for what it's intended for I guess

sighs

[hollow sorrel]

what do you use the grouping for

is it just organization

[spark glade]

it's really just to enable.disable a bunch of them easily

yeah

[hollow sorrel]

yea i suppose that's up to you
i think if the main assumption is that these groups run somewhat isolated from eachother then should be fine grouping them like this
if you expect to need a lot of after and before physics you could always split them up into two more groups

things would start to get tricky if you got stuff in gamesetup relying on gameruntime and other way around at same time but when is that the case

[spark glade]

setup and runtime are 100% isolated

But in the end I think the only real solution, possibly also performance wise, would be to flatten it out completely.

Flat seems to be better than having like 10 systems:

GameSetupBeforeBuildPhysicsSimulationSystemGroup
GameSetupAfterBuildPhysicsButBeforeExportPhysicsSimulationSystemGroup
....
GameSetupAfterPhysicsSimulationSystemGroup

😄

[hollow sorrel]

yea that's true

btw AfterBuildPhysicsButBeforeExport i know this was just example but i don't think there is a reason to ever actually do this

buildphysicsworld = read componentdata and convert to internal simulation format
stepphysicsworld = update simulationdata
exportphysicsworld = write simulationdata back to componentdata

so generally you'd either want before build or after export

[spark glade]

hm true

But that's just physics. I see this getting cancerous and hard to debug.

So a simple System that just sets fetches a bunch of systems with GetOrCreateSystem in OnCreate and sets .Enabled whenever I want feels easier.

Btw, just confirmed that a [UpdateBefore(typeof(BuildPhysicsWorld))] on GameSetupSimulationSystemGroup is the one liner stop gap fix 🙃

[urban remnant]

Hey. Is DOTS visual scripting (https://forum.unity.com/threads/dots-visual-scripting-6th-experimental-drop.795807/) dropped? I can't find it package manager

[deft stump]

nope. it's still l very much in alpha that's why you can't find it in PM.

[urban remnant]

@deft stump so it was there and then removed? Because I see some dudes in YouTube creating tutorials with it?

[deft stump]

it was never there in the first place as of yet.
they manually installed it by modifying the manifest.json file

[urban remnant]

@deft stump OK, so whatever. I do need production ready tech, so this is not relevant anyway

[deft stump]

¯_(ツ)_/¯

[urban remnant]

But it's damn promising > https://www.youtube.com/watch?v=nqt3p1n342A

ECS + Visual Scripting = Bomb

[willow plaza]

Damn. Trying to understand navmesh pathfinding dots implementation drives me crazy ><

[urban remnant]

DOTS is being in development now for an eternity, can they just nail it with all the resources they have

Lazy devs 😄

[gusty comet]

as far as I understand, navmesh with dots is basically doing it yourself

pretty odd to see that after 2 years of ecs development tbh

makes me wonder if we would have a stable ecs if unity had developed games instead of demos

2 years is a pretty significant amount of time imho

[willow plaza]

as far as I understand, navmesh with dots is basically doing it yourself
@gusty comet wdym?

[gusty comet]

iirc existing navmesh solution(s) doesn't work for dots since they are single threaded, not jobified

can't remember if navmesh generation is jobified, but pathfinding certainly wasn't

[north bay]

Didn't they expose the low level navmesh stuff?

[gusty comet]

all of the dots examples use low level pathfinding, some aren't even pathfinding at all

its there, but if you want to find a path with a system, you are on your own

there are community projects though, but they all have their own caveats

[willow plaza]

They have exposed the jobified part and there are a few implementations on github

[gusty comet]

those implementations are super basic, thats what I'm saying

[willow plaza]

I'm currenly trying out this one: https://github.com/reeseschultz/ReeseUnityDemos

[gusty comet]

their nordeous demo can't even be called pathfinding

thats community stuff, not unity official stuff

[willow plaza]

I've never said anything about official stuff. It builds on the stuff that they exposed though.

It's based on the NavMeshQuery (https://docs.unity3d.com/ScriptReference/Experimental.AI.NavMeshQuery.html).

[gusty comet]

I'm not even sure what you are saying at this point, all I said was, if you want dots + navmesh, you have to do it yourself, which is basically what you are doing by having trouble understanding the community solutions since there is no proper solution by the unity devs

anyway, thats all I'm gonna say

[willow plaza]

Well, that's what I was saying myself as well 😄

[tight blade]

any tips for logging / inspecting intermediate values from jobs/ non main thread code?

[opaque ledge]

temporarily disable burst and run on main thread

and use Debug.Log

[tight blade]

oh nice! let me go look into that

huh... onUpdate supposedly runs on the main thread but I'm not even seeing this go to the console

query is stored in onCreate. maybe ill print in there..

okay, log statements in the onCreate run, but log statements in the onUpdate do not

okay weird. The system doesnt even show up in the entity debugger, even though the statement in the onCreate is being logged

ah hah! you can check "show inactive systems"

[willow plaza]

can someone explain me what's the point of:

Dependency = JobHandle.CombineDependencies( Dependency, buildPhysicsWorld.GetOutputDependency() );

if the system is set to update after physics systems (I think):

[UpdateAfter(typeof(BuildPhysicsWorld))]

is it because some job is not guaranteed to be complete when the system has finished updating?

[stiff skiff]

Correct

[willow plaza]

Alright! I feel like I'm getting smarter. 😄

[balmy horizon]

I'm trying to install all the necessary packages for ECS, but the Hybrid Renderer package is throwing me errors

[willow plaza]

@balmy horizon are trying to set up project tiny?

[balmy horizon]

Yes, but I don't intend to build for mobile platforms, I'm just installing it because I think I'm supposed to

Is tiny necessary?

[willow plaza]

no, tiny is a separate package that is built upon ecs.

[balmy horizon]

So I don't have to use tiny at all if I'm just making something for desktop?

[willow plaza]

If you only need ecs you need to import the Entities package and it will download most of the dependencies automatically.

[balmy horizon]

Now I have 53 errors

[willow plaza]

try to start a new project and import only the Entities package.

[balmy horizon]

No errors this time, just 2 warnings. Thank you

[rough arch]

https://issuetracker.unity3d.com/issues/high-cpu-usage-when-entity-debugger-window-is-open

HIGH CPU USAGE WHEN ENTITY DEBUGGER WINDOW IS OPEN

Please vote

[mighty whale]

Ok it's really dumb but for some reason I can't find it: how do i round a float3 ?

[tight blade]

@mighty whale math.round(new float3(1.2, 1.5, 6.6))

[mighty whale]

nevermind i finally found it

lol

thanks

for some reason the doc was not loading

and i couldn't ctrl+f it

[tight blade]

I know how it is

[humble mason]

what is a good way to access, say, a textmeshpro from an ECS system?

in order to edit the text

im having a bit of trouble using ui and ecs because im pretty new to the whole thing

[zinc plinth]

same way you would access stuff in a monob

just put it in OnCreate to not nuke your performance

[humble mason]

i was hoping i could declare a public variable in the system where i could dragdrop the textmeshpro object into 😛 @zinc plinth

can you explain about the OnCreate a bit more?

[zinc plinth]

you can't ref it in editor, you have to search for it with normal gameobject code

maybe create a mono with a static field and save it from there ?

[humble mason]

ah and that's what I should put in the oncreate?

[zinc plinth]

you just fetch your go?..

that's not a dots question

[humble mason]

thanks 🙂

im quite inexperienced both on dots and unity itself

[zinc plinth]

you should learn a bit of unity before starting dots

[humble mason]

yea im probably trying to bite more than i can chew 😦

[mighty whale]

so i got a system that calls something that has to create entity, it seems i need to use this https://docs.unity3d.com/Packages/com.unity.entities@0.10/manual/entity_command_buffer.html
however I cannot access the "World" outside my system, is there any way to acquire the entity command buffer properly outside of a system ?

[hollow sorrel]

why can't you access the world outside your system

[mighty whale]

I just mean that an instance of World is an attribute of SystemBase

and i think i need to grab an instance of world but idk maybe i can make a new one

i just want to know if there's any clean way to use entity command buffer outside of a system

[hollow sorrel]

huh

how is your code structured right now

[mighty whale]

uuuh it's complicated

[hollow sorrel]

should be able to use ecb from outside a system but you're still gonna need a reference to it somehow

[mighty whale]

ok imma try to sum it up

yeah ok

mmmmh

ok thank you i'm going to think about changing the structure

[odd ridge]

is there an example of a 2d grid implementation in DOTS? I want to have a 2d spatial grid to organize my entities, each cell can contain any number of entities.

my first thought was, for every entity that is in cell coordinate (0,0), I will give them the tag Cell_0_0, so that I can query my entities for the tag Cell_0_0 to obtain all entities in this cell. but I don't think it's the right solution because I can't generate tag names.

if every entity that is in a same cell share a same tag and archtype, then all entities that belong to a cell should be next to each other in memory. but I can't generate tag names, so how would you do that otherwise

[hollow sorrel]

@odd ridge there's a billion different ways to implement 2d grids but as for your example, if you're looking to do it that way then it sounds like you want ISharedComponentData
for example you could have a GridPosition : ISharedComponentData that holds a int2 Value with its position, then everything with a different value will be grouped and put into its own chunk

all entities in same cell would be next to eachother in memory

[pulsar jay]

My ExecuteInEditMode Scripts are enabled/disabled between playmode changes where the DefaultGameObjectInjectionWorld is null which throws a null reference exception. Anybody has an idea why this happens? Is this intentional? Any way to avoid it?

public class PlayModeTest : MonoBehaviour
{
    public void OnEnable()
    {
        if(!Application.isPlaying) 
            DefaultWorldInitialization.DefaultLazyEditModeInitialize();
        Debug.Log($"OnEnable World:   
            {World.DefaultGameObjectInjectionWorld?.Name}");
    }
    
    public void OnDisable()
    {
        Debug.Log($"OnDisable World: 
            {World.DefaultGameObjectInjectionWorld?.Name}");
    }
}```

The output is this:

The OnEnable/Disable in the middle should not happen imho

[scarlet inlet]

are there examples using NativeBitArray ? I am mostly curious about how it could be used with special SIMD instructions

[odd ridge]

@hollow sorrel how else would you do it? what would be the best way

[stiff skiff]

@pulsar jay You should probably add some brackets to that if statement

[zinc plinth]

@odd ridge do not use shared components for grid coordinates

use a buffer on your primary grid entity and flatten your 2d array into 1d

tho that's only possible for a finite grid

[pliant pike]

I don't suppose anyone knows how a GameObjectConversionSystem works and runs, like does it require something in the scene to be referenced in it for it to run?

[zinc plinth]

why, what's your usecase ? @pliant pike

if you're wanting to use ConvertGameObjectToEntityFields outside IConvertGameObjectToEntity, that's not possible

[pliant pike]

I'm trying to convert some scriptable objects into entity's

[zinc plinth]

then you need to "convert" by hand using your own script

you have EntityManager available inside the main thread

• World.Default.... EntityManager

[pliant pike]

ok, I guess I'll have to use a monobehaviour then?

[zinc plinth]

not necessarily, you can have a method in your so which have all your entity creation logic, and you can call it from whereever you like on the main thread

[pliant pike]

I'm using addresables to load them that part works at least

did you mean you can have a method in the scriptable object that converts it?

[zinc plinth]

there's no conversion from SO to entity, you have to create the entity you want yourself

[pliant pike]

yeah I know I understand that

anyway thanks for the help

[zinc plinth]

np