#archived-dots | Official Unity Discord | Page 93

rare umbra Nov 13, 2019, 6:30 PM

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Today is the day! (Wishful thinking)

onyx mist Nov 13, 2019, 6:44 PM

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I read the first part of that and got excited lol. I'll join you with wishing

coarse turtle Nov 13, 2019, 7:15 PM

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lol same here

stable fog Nov 13, 2019, 7:24 PM

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is today the day?

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I got a question, I've asked it before but no one responded

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I have a situation where I'm generating a few million raycast commands

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its for analyzing a scenes structure

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and i found that populating the NativeArray<RaycastCommand> too more time than actually executing the Raycasts

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I'm executing the raycasts in a batch, and so its being executed in parallel

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however, I'm populating the NativeArray sequentially in a loop

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is it possible for me to populate that NativeArray in paralell, via jobs or something?

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few million actually meaning about 200 million

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ideally, though it will likely end up being less

safe lintel Nov 13, 2019, 7:35 PM

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yeah you can populate nativearrays in jobs

stable fog Nov 13, 2019, 7:36 PM

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noice

knotty radish Nov 13, 2019, 7:44 PM

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Hey everyone, I'm looking for some info that may or may not exist (I'm asking before making a thread and after searching).
Is there anything saying that we should reduce the number of components on the same entity ?
Also anything about the size of the component itself (let's say all the fields are always used by the system) ?
Thanks!

onyx mist Nov 13, 2019, 7:46 PM

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Iirc the recommended limit for the amount of component fields is 100 bytes. I've heard that It's better to have a lot of components with a few fields than one component with many fields

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For your first question I'm not sure and also interested in an answer

knotty radish Nov 13, 2019, 7:46 PM

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Yeah heard about that too but didn't know about the 100 bytes

onyx mist Nov 13, 2019, 7:47 PM

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I do notice that when I have many components on an entity, chunk utilization goes way down

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Might be me assigning correlation to the wrong thing tho

knotty radish Nov 13, 2019, 8:10 PM

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I will post a thread ~tonight and see if I can have some answers from the unity devs

onyx mist Nov 13, 2019, 8:33 PM

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Ok can you let me know when you do?

knotty radish Nov 13, 2019, 9:31 PM

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Sure!

merry oasis Nov 13, 2019, 9:59 PM

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is there any solution to lack of NativeArray<NativeArray<T>> / NativeList

plain cloak Nov 13, 2019, 10:04 PM

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you could flatten it for array case

merry oasis Nov 13, 2019, 10:04 PM

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nope, this is not for 2d array

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i need a proper jagged array and it looks like implementing it myself is the only way which is really frustrating

plain cloak Nov 13, 2019, 10:05 PM

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would it be possible to use native multi hashmap instead, thats what i do

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i also read somewhere about using entities with buffers like 2d array

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i mean jagged*

merry oasis Nov 13, 2019, 10:07 PM

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i mean my use case is for managing sub-meshes for mesh generation

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ill try multi hashmap, im not making very large meshes yet so performance will probably be fine 🤷

low tangle Nov 13, 2019, 11:48 PM

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It's fast, and yeah that's the tool I use for jagged arrays, works well with the matching job to visit values

onyx mist Nov 14, 2019, 3:50 AM

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is there a way i can extend the math.random class? i want to add a simple method but not sure where i can find it

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📎 unknown.png

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basically a chance method

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so if ( Chance(2) ) {}

merry oasis Nov 14, 2019, 4:12 AM

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ref extension method should work @onyx mist

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    public static class RandomExtensions
    {
        public static int Chance(this ref Random rand, int inp)
        {
            
        }
    }

onyx mist Nov 14, 2019, 4:13 AM

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wouldnt extension methods not work in jobs because they are static?

merry oasis Nov 14, 2019, 4:14 AM

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no they are fine

onyx mist Nov 14, 2019, 4:14 AM

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NICE

merry oasis Nov 14, 2019, 4:14 AM

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you should just avoid accessing static data

onyx mist Nov 14, 2019, 4:14 AM

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oh so even normal static methods would work?

merry oasis Nov 14, 2019, 4:14 AM

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like everything in the Unity.Mathematics.math class is static right? but obviously those are all fine to use

onyx mist Nov 14, 2019, 4:15 AM

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ok thank you!!!

merry oasis Nov 14, 2019, 4:15 AM

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yes methods are totally fine, just make sure to not access any shared static data and you're all set

untold night Nov 14, 2019, 4:16 AM

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you can read static readonly data if it's burst compatiable, but such data will get backed into constants access by bursted functions

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you can't write to static data, as others have pointed out

merry oasis Nov 14, 2019, 4:17 AM

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well static readonly struct fields are immutable by design, but its good to know that Burst/Jobs won't complain about them

onyx mist Nov 14, 2019, 4:18 AM

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"but such data will get backed into constants access by bursted functions" sorry could you elaborate on this?

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im not sure what that means

fathom trout Nov 14, 2019, 4:20 AM

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@stable fog you can probably pass nativeslices of that array and populate in parallel

untold night Nov 14, 2019, 4:29 AM

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@onyx mist - this article explains it in depth: https://jacksondunstan.com/articles/5274#more-5274

JacksonDunstan.com

jackson

JacksonDunstan.com

JacksonDunstan.com covers C# programming for Unity

onyx mist Nov 14, 2019, 4:30 AM

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gotcha!

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ty!

plain cloak Nov 14, 2019, 7:55 AM

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is there a way to disable transform conversion system?

prime cipher Nov 14, 2019, 10:09 AM

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While Rotation component allows to rotate and Translation component allows to move, which component should be used for scaling an entities appearance. Probably the rendered mesh needs to be scaled, as it sounds weird that the entity has a scale itself. But I can't find a property for RenderMesh that reflects a rendered scale. Sry, probably a dumb question.

slow epoch Nov 14, 2019, 10:27 AM

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LocalToWorld component has the scale

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But i don't know how to modify the matrix to scale it

amber flicker Nov 14, 2019, 10:44 AM

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yea Scale or NonUniformScale (IComponentData's) are probably what you're looking for @prime cipher

languid stirrup Nov 14, 2019, 12:13 PM

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Is there any better way of creating an Entry point for coding in the DOTS world instead of a monobehaviour attached to an empty gameobject. I am trying a JobComponentSystem class with a EndSimulationEntityCommandBufferSystem var in it. Is there a better way?

prime cipher Nov 14, 2019, 12:24 PM

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@digital scarab @amber flicker THX, works like a charm.

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[BurstCompile]
    [RequireComponentTag(typeof(SpaceObject))]
    struct OrbitingJob : IJobForEachWithEntity<Orbit, Translation>
    {
        public float DeltaTime;
        [ReadOnly] public ComponentDataFromEntity<Translation> Translations;

        public void Execute(Entity entity, int index, [ReadOnly] ref Orbit orbit, ref Translation translation)
        {
            Translation pivot = Translations[orbit.Focus];

            float3 dir = translation.Value - pivot.Value; // get point direction relative to pivot
            dir = Quaternion.Euler(0f, orbit.Speed * DeltaTime, 0f) * dir; // rotate it
            translation.Value = dir + pivot.Value; // calculate rotated point
        }
    }

    protected override JobHandle OnUpdate(JobHandle inputDependencies)
    {
        Debug.Log("SpaceObjectOrbitingSystem::OnUpdate()");

        var job = new OrbitingJob()
        {
            DeltaTime = Time.deltaTime,
            Translations = GetComponentDataFromEntity<Translation>(true)
        }.Schedule(this, inputDependencies);

        return job;
    }

shouldnt that work for the ComponentDataFromEntity? I get a weird exception: "InvalidOperationException: The writable NativeArray OrbitingJob.Iterator is the same NativeArray as OrbitingJob.Data.Translations, two NativeArrays may not be the same (aliasing)"

amber flicker Nov 14, 2019, 12:40 PM

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you can't have a CDFE take the same type (Translation) as the Job itself

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you can remove Translation from the IJobForEach and use the entity passed into execute to get it from the CDFE instead

prime cipher Nov 14, 2019, 12:51 PM

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@amber flicker Oh I C, I thought it would be the combination of refs, so that Translation is different than Orbit+Translation

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However, as I have the Entity also, I can simply get the Translation from the CDFE too

amber flicker Nov 14, 2019, 12:52 PM

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I think it's because there's nothing to stop you getting the same Translation (from the CDFE) as the one that would be passed as ref into the job so guaranteeing safety for writing is why that restriction exists I'd guess

prime cipher Nov 14, 2019, 12:54 PM

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Yes, but now I need to declare the CDFE to be writable 😦

amber flicker Nov 14, 2019, 12:54 PM

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yes

pliant pike Nov 14, 2019, 3:11 PM

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ironic I'm trying to do something similar to the example above but I need to iterate through all the CDFE in a for loop

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I dont think I can do that though, I'm guessing I need to use an EntityQuery instead

amber flicker Nov 14, 2019, 3:35 PM

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Accessing components via CDFE is all rand access so it can be vastly better to iterate over a query if possible (which it should be)

glad grail Nov 14, 2019, 3:37 PM

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hi all, can anyone advise how to change which Material an entity is being rendered with? I can't seem to use RenderMesh in ForEach like I can with the Translation component...

pliant pike Nov 14, 2019, 3:38 PM

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for each entity I need to iterate over all other entities and check the distances between them so EQ converted to nativearray I guess would be best

amber flicker Nov 14, 2019, 3:39 PM

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@glad grail the reason you can't iterate over them is because every RenderMesh is a SharedComponentData which puts each entity with a different mesh into a separate chunk.

glad grail Nov 14, 2019, 3:40 PM

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oh so all entities instantiated from the same Prefab share the same SharedComponentData

amber flicker Nov 14, 2019, 3:40 PM

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@pliant pike not sure the best way to do that - you can't avoid rand access - nativearray method probably works as good as any - only thing that occurs to me is you may not want to calculate the distance from A to D as well as from D to A

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@glad grail if the prefab has a RenderMesh, then basically yea, they'll all be entities with a SharedComponentData (RenderMesh) with the same value/hash - you can actually iterate over the entites, just not using foreach<RenderMesh>

glad grail Nov 14, 2019, 3:44 PM

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Thanks @amber flicker can you recommend a good way to change material (to show unit selected in RTS)? Or maybe show/hide a second child mesh?

amber flicker Nov 14, 2019, 3:51 PM

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I haven't done anything with materials and it's quite implementation specific but in case it helps point you in the right direction, you could e.g. add a 'Selected' tag to your unit and then do something like (psuedo code)myQuery = GetEntityQuery( ComponentType.ReadOnly<Selected>()); entityManager.SetSharedComponentData(myQuery, new RenderMesh(){ //your new values e.g. mesh = unitMesh, material = highlightMaterial .. }) This is a batch method. Otherwise you could iterate the query in a system and do e.g. var renderMesh = entityManager.GetSharedComponentData<RenderMesh>(entity); renderMesh.material = highlightMaterial; entityManager.SetSharedComponentData(entity, renderMesh); @glad grail

glad grail Nov 14, 2019, 3:58 PM

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that's really useful I'll look into that thanks @amber flicker

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For the second snippet, is renderMesh an object? i.e. if I change it will it affect all entities using that RenderMesh, or will it assign a new one just to the selectected entity?

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tbh the first approach looks like it will fit better anyway, just interested really.

amber flicker Nov 14, 2019, 4:07 PM

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so the first approach relies on you setting e.g. all the query results to have the same mesh (useful when you do want to change all in a bulk way but maybe not what you want a lot of the time). The second does assign to just one entity after getting the current values. You could mix them and e.g. get the RenderMesh from entity 1 then use a query to set the shared mesh for a bunch of entities at once. Not sure if that helps/makes sense.

glad grail Nov 14, 2019, 4:09 PM

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Yep that answers my question, SetSharedComponentData will assign a new data to just the one entity in the second code snippet.

civic bay Nov 14, 2019, 5:24 PM

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How can I change the scale of an Entity using the new ECS?

dry dune Nov 14, 2019, 5:27 PM

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EntityManager.SetComponentData(entity, new Scale(){Value=1.0f});

civic bay Nov 14, 2019, 5:29 PM

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I tried that but I just get this error: ArgumentException: A component with type:Scale has not been added to the entity.

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@dry dune

amber flicker Nov 14, 2019, 5:31 PM

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I'm not a big fan of the way it works - there's two things that could be going on here - both visible via the entity debugger. I would guess your entity doesn't have a 'Scale' component. It likely either has a) no Scale component or b) a NonUniformScale component. If a) then add a Scale component. If b) change the NonUniformScale instead.

dry dune Nov 14, 2019, 5:31 PM

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then replace set with add

civic bay Nov 14, 2019, 5:32 PM

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📎 unknown.png

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I have this set up though

amber flicker Nov 14, 2019, 5:32 PM

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how does it look in the entity debugger?

civic bay Nov 14, 2019, 5:32 PM

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And then when I spawn the entity I call

                m_entityManager.SetComponentData(glitter, new Scale { Value = Random.Range(0.1f, 10.0f) });

safe lintel Nov 14, 2019, 5:33 PM

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are you trying to set the scale of a hybrid entity or a pure ecs entity?

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because scale wont have any effect if you are using the old transform

amber flicker Nov 14, 2019, 5:34 PM

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also.. adding a Transform component? does that do anything useful?

civic bay Nov 14, 2019, 5:36 PM

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Yeah I believe hybrid @safe lintel

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Also @amber flicker

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Removed Transform

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Didn't do anything, no

safe lintel Nov 14, 2019, 5:41 PM

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well if you continued using the transform, it would be most optimal to change scale via a ComponentSystem
like

            Entities.With(m_GlitterQuery).ForEach((Entity entity, Glitter glitter, Transform transform) =>
            {
                   transform.localScale = newScaleVariable;
            });

civic bay Nov 14, 2019, 5:45 PM

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I got rid of the transform

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So should I not be able to just add the NonUniformScale component?

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Sorry, very new to this way of programming so it's confusing me haha

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📎 unknown.png

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That's the entity debugger

safe lintel Nov 14, 2019, 5:48 PM

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the pinned message has good info, also the docs especially relating to the transform system shows in depth how it all works, its a bit much on first glance but just read it slowly and it will begin to make sense https://docs.unity3d.com/Packages/com.unity.entities@0.1/manual/transform_system.html

civic bay Nov 14, 2019, 6:16 PM

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Thanks for the help @amber flicker @dry dune @safe lintel I got it sorted in the end. I used CompositeScale and setting the matrix manually. Probably not the best way to do it but it works haha

mystic mountain Nov 14, 2019, 9:31 PM

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We're moving to the end of the week, and still nothing :' (

tawdry tree Nov 14, 2019, 9:33 PM

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Such is development life, or at least the ones waiting on releases.
I'm they're all working as hard as is reasonable (possibly even more than that) to get it out as soon as they can.

safe lintel Nov 14, 2019, 11:06 PM

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hopefully friday's the day

onyx mist Nov 15, 2019, 1:02 AM

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Is it good practice to have a dynamic buffer on entities with a lot of fields in order to save on memory in the chunk? Only a single buffer so an entity wouldn't have more than one of these

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Example: a bufferelement of personality with int fields like greed, kindness, pride, extroversion, etc

safe lintel Nov 15, 2019, 4:16 AM

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are you actually running out of memory on the chunk?

onyx mist Nov 15, 2019, 4:44 AM

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i currently have a lot of components on my entities so any reduction on that would be great

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the ability to clump all the personality traits into one buffer that stores its mem on the heap sounds lovely

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https://puu.sh/EEJTy/f559c810b6.png

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basically i wanna know if what i did for personality here is ok

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and also if i can add more fields or if thats already too many

safe lintel Nov 15, 2019, 4:47 AM

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dont see any reason that there would be anything wrong with doing that, more curious how many components and fields in total you have?

onyx mist Nov 15, 2019, 4:51 AM

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ill send a pic in a sec

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https://puu.sh/EEK5u/f5680b1bd9.png

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https://puu.sh/EEK4X/31c3fe6513.png

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still trying to find ways to minimize the amount but a lot of it are tags

safe lintel Nov 15, 2019, 4:58 AM

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did you set the internal buffer size to something low? ive never personally tried it with zero

onyx mist Nov 15, 2019, 4:59 AM

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i didnt set the buffer size at all since i assumed it would make it so it would push all of it onto the heap

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and i read buffers could be gigabytes in size if need be so hey why not lol

safe lintel Nov 15, 2019, 5:00 AM

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well my understanding is the internal size is whats stored in the chunk, and above that it goes to the heap

onyx mist Nov 15, 2019, 5:00 AM

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exactly

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i dont want any of the buffers stored in the chunk ideally

safe lintel Nov 15, 2019, 5:01 AM

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oh right i get what you mean, wasnt sure if there was some hidden default if you dont happen to specify

onyx mist Nov 15, 2019, 5:02 AM

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hm im not sure 🤔

safe lintel Nov 15, 2019, 5:03 AM

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but all in all, id personally just store it as regular components until i ran into a problem, unless theres a particular reason you are trying to have the chunk store as many as possible?

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if you are regularly iterating on them arent you giving up all the benefits of linear memory layout?

onyx mist Nov 15, 2019, 5:05 AM

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isnt that the ideal? all i know is i saw my chunk utilization go from 803 at the start of the project to 34 now and i got worried

safe lintel Nov 15, 2019, 5:05 AM

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premature optimization isnt ideal 🙂

onyx mist Nov 15, 2019, 5:05 AM

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true

safe lintel Nov 15, 2019, 5:05 AM

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and it might not be an optimization at all in your case

onyx mist Nov 15, 2019, 5:07 AM

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yeah i think you're right! ill do more testing

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in fact no you are right

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thanks!

safe lintel Nov 15, 2019, 5:09 AM

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i dont know if theres a way to view cache usage, but the megacity project has a really high usage of chunks and i personally dont have any problems with it

onyx mist Nov 15, 2019, 5:17 AM

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i gotchu

languid stirrup Nov 15, 2019, 7:08 AM

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guys, I have been following the ECS unity tutorial on youtube. and it uses IJobProcessComponentData to filter which entities to work on. But i am trying it in code right now, and it doesnt seem to have IJobProcessComponentData anymore. Am i mistaken? if not, whats the best other subsitute for it? IJobParralelForFilter?

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that tutorial video also mentions the [computejoboptimization] tag which my editor doesnt seem to recognize.

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here precisely https://youtu.be/j2z5KRWZTDA?t=326

YouTube

Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.

magic frigate Nov 15, 2019, 7:16 AM

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That is a very old tutorial

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Changed to [BurstCompile]

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https://forum.unity.com/threads/where-is-computejoboptimization-attribute.686311/

Unity Forum

Where is [ComputeJobOptimization] attribute?

Recently I watched official videos about ECS: https://unity3d.com/ru/learn/tutorials/topics/scripting/introduction-ecs
In videos there are...

solar spire Nov 15, 2019, 7:21 AM

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https://www.youtube.com/watch?v=BNMrevfB6Q0&list=PLX2vGYjWbI0S1wHRTyDiPtKLEPTWFi4cd is a generally good place to start with up to date video tutorials around DOTS

languid stirrup Nov 15, 2019, 7:21 AM

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ah, thnx @magic frigate and @solar spire

magic frigate Nov 15, 2019, 7:22 AM

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Jeez, even that video might be partially out of date in a matter of days

languid stirrup Nov 15, 2019, 7:22 AM

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oh wait, no.. I am not converting from gameobjects, I am making everything new from code

magic frigate Nov 15, 2019, 7:23 AM

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I think the title means more to convert the way the game is written rather than just the conversion workflow

languid stirrup Nov 15, 2019, 7:23 AM

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oh ok

solar spire Nov 15, 2019, 7:23 AM

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It's a whole playlist of all of the DOTS content from Unite Copenhagen

languid stirrup Nov 15, 2019, 7:23 AM

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gotcha, so weekend full for 43 minutes videos each :p

solar spire Nov 15, 2019, 7:23 AM

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Pretty much 😛 I have all of them in my watch later list

languid stirrup Nov 15, 2019, 7:25 AM

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lol

solar spire Nov 15, 2019, 7:34 AM

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Website
https://unity.com/dots
Megacity: https://unity.com/megacity
Project Tiny: https://unity.com/solutions/instant-games

DOTS Best Practices
https://learn.unity.com/course/dots-best-practices

Forums
https://forum.unity.com/forums/data-oriented-technology-stack.147/
Physics: https://forum.unity.com/forums/dots-physics.422/
Netcode: https://forum.unity.com/forums/dots-netcode.425/
Graphics: https://forum.unity.com/forums/dots-graphics.641/

ECS 1.0
https://forum.unity.com/threads/experimental-entities-1-0-is-available.1341065/

Videos • GDC 2022
Authoring and debugging workflows https://www.youtube.com/watch?v=p4ct4vHWYt0
Path to leveraging DOTS in production https://www.youtube.com/watch?v=KJOhIhOv2EI

• Unite Copenhagen 2019
https://www.youtube.com/watch?v=BNMrevfB6Q0&list=PLX2vGYjWbI0S1wHRTyDiPtKLEPTWFi4cd

Roadmap
https://unity.com/roadmap/unity-platform/dots

#

Guide
https://github.com/Unity-Technologies/EntityComponentSystemSamples/tree/master/DOTS_Guide

DOTS Samples (Entities & Physics): https://github.com/Unity-Technologies/EntityComponentSystemSamples

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@dull copper your legacy will always be remembered o7

dull copper Nov 15, 2019, 7:36 AM

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for those wondering about this, the old pinned message couldn't fit all the info on single message anymore, so had to be repinned (with extra message to reserve more space)

solar ridge Nov 15, 2019, 7:58 AM

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@solar spire I saw that post and was like YES AN UPDATE! soarynHappy ... then was saddened to just see it is book keeping with having all the latest links available soarynSad why do you play with my heart so?

solar spire Nov 15, 2019, 8:01 AM

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If Discord allowed me to reorder pins or post messages larger than 2000 characters I wouldn't be here relishing in your pain

solar ridge Nov 15, 2019, 8:01 AM

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Loool

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No worries

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Im on standby development wise until they release the next update

solar spire Nov 15, 2019, 8:02 AM

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Everyone's waiting on that networking sample!

solar ridge Nov 15, 2019, 8:02 AM

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Networking will be fantastic! Though Im assuming they dont have a TCP handle at all

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which in my case wont assist if they dont but wont be surprised if that is skipped over 😛

twin raven Nov 15, 2019, 9:31 AM

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I read Soaryns message "YES AN UPDATE" and got excited 😭

prime cipher Nov 15, 2019, 9:33 AM

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If I choose Convert and Inject Game Object with Convert To Entity, can I access the injected game object having the entity at hand?

worn stag Nov 15, 2019, 2:37 PM

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can we have fps sample release today please🥺

frank knoll Nov 15, 2019, 3:17 PM

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Does anyone have ideas how to draw gizmos for component systems and entities without using monobehavior?

tawdry tree Nov 15, 2019, 3:20 PM

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In-editor you use mono for just about everything, so I'd assume you can't.
Though, all you'd need mono for would be the drawing itself; you could make some system basically output the exact inputs the gizmo drawing system uses. I suspect it might be easier to just have a mono class that reads entitycomponents and draws from that directly, though.

coarse turtle Nov 15, 2019, 4:11 PM

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@prime cipher yes you can

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You can grab the component object via entity manager or using the query builder

low tangle Nov 15, 2019, 4:13 PM

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There's also some good stuff in EntityManager.Debug

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Forgot the exact name

gusty comet Nov 15, 2019, 4:38 PM

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@frank knoll For that I use a Singleton, which allows to add Actions. The MonoB iterates over the Actions in OnDrawGizmos and invokes them. In my Systems I can then call the add method with anonymous body using the Gizmos.Draw* methods.

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But yes at least for drawing you need the one MB to hook onto OnDrawGizmos

civic bay Nov 15, 2019, 5:18 PM

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I'm creating pure entities, not instantiating gameobjects and converting them

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But how can I add Physics Body to it?

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And Physics Shape Authoring

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And to set values, i.e. dynamic and mass = 10

craggy orbit Nov 15, 2019, 5:24 PM

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the Physics Body is a simplification of the actual components that go into creating a rigidbody equivalent. here are the ECS components that go into it (plus a link on creating it through code, for good measure: https://docs.unity3d.com/Packages/com.unity.physics@0.2/manual/getting_started.html )

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📎 Screen_Shot_2019-11-15_at_10.23.46_AM.png

civic bay Nov 15, 2019, 5:28 PM

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Ah brilliant, so I can add those components separately

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like a normal component

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and set the values that way?

craggy orbit Nov 15, 2019, 5:28 PM

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yep. exactly

civic bay Nov 15, 2019, 5:28 PM

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Thanks for your help 🙂

craggy orbit Nov 15, 2019, 5:28 PM

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just to make sure we're on the same page, it's an ECS component, not monobehaviour

civic bay Nov 15, 2019, 5:29 PM

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Yeah, extending from IComponentData, right?

craggy orbit Nov 15, 2019, 5:29 PM

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yeah (im 90% sure)

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might extend from something else but it is an ECS component

civic bay Nov 15, 2019, 5:36 PM

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Brilliant, cheers

languid stirrup Nov 15, 2019, 6:09 PM

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so, i have added a "toGenData" component to my entities and im just using it as a tag to generate some data for the entity. In the relevant JobComponentSystem I have a IJobForEachWithEntity<> job setup. At the end of this job's execute function I want to remove the toGenData component from this entity. I see i need a EntityCommandBuffer. and most examples i see, they are attaching it to a EndFrameBarrier. Is this appropriate/best way of doing it in my case?

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mind you, this data only needs to be be generated the first time for every entity, even newer ones. hence using this tag

onyx mist Nov 15, 2019, 6:27 PM

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By endframebarrier do you mean like end[insert-system-group-here]barrier? Or postupdatecommands?

languid stirrup Nov 15, 2019, 6:35 PM

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like World.GetOrCreateSystem<EndFrameBarrier>(); and m_EndFrameBarrier.CreateCommandBuffer(), and the link from where i got it https://docs.unity3d.com/Packages/com.unity.entities@0.0/manual/entity_iteration_job.html its the last code snippet on the page

onyx mist Nov 15, 2019, 6:37 PM

#

Ahh I didn't know that was a thing. I usually just use the system group ECBs

languid stirrup Nov 15, 2019, 6:39 PM

#

will that help me in my case?

#

and you mean the entitycomponentbuffers?

onyx mist Nov 15, 2019, 6:47 PM

#

Yes

#

I have a similar system to yours with a "toBeUpdated" tag. I usually do that in the beginsim ECB and haven't had any issues so far with it

languid stirrup Nov 15, 2019, 6:51 PM

#

are u using JobComponentSystem class with IJobForEachWithEntity job to perform logic on your entities?

onyx mist Nov 15, 2019, 6:52 PM

#

Yes

#

Tho remember to take my words with a grain of salt since I didn't know about endframebarrier 🤔 no idea how that differs from the group ECBs

languid stirrup Nov 15, 2019, 6:53 PM

#

hmmmm, what do you mean groups's ECB's?

onyx mist Nov 15, 2019, 6:53 PM

#

But as I said even iteration over tens of thousands of entities I haven't had an issue with my datagen tag

#

📎 image0.png

#

These ECBs

#

Keep in mind I'm abysmal at terminology

languid stirrup Nov 15, 2019, 6:54 PM

#

oh.. i didnt know about these ECBS

onyx mist Nov 15, 2019, 6:54 PM

#

Wish I was home so I could just show you the code for my system 😔

#

Ah

#

Looks like we learned something new about command buffers from each other

languid stirrup Nov 15, 2019, 6:55 PM

#

please do when you do get home! lol, I could use all the insights i can get specially if you are doing simialr code

#

endframebuffer is supposedly the postupdate command buffer thingy for JobComponentSystems

#

as you dont get a postupdate command buffer for the JCS

onyx mist Nov 15, 2019, 6:55 PM

#

Ah I assumed so since they sound like synonyms

#

That's interesting

languid stirrup Nov 15, 2019, 6:56 PM

#

but in my Execute, i cant seem to get anything about of the EntityCommandBuffer 😦

onyx mist Nov 15, 2019, 6:56 PM

#

Maybe the group ECBs are for more specific frame timings

#

📎 image0.jpg

#

Here's how I got my command buffer in a different system

languid stirrup Nov 15, 2019, 7:00 PM

#

lol, I just check for group ECB in the code and wow... there are so many of them!!!!

#

how i paste code? cant seem to paste code here lol

onyx mist Nov 15, 2019, 7:02 PM

#

Usually I just screencap it

craggy orbit Nov 15, 2019, 7:03 PM

#

it's best to use 3 backticks (`) around block of code

#

you can put "cs" after the first set of 3 for basic syntax coloring

languid stirrup Nov 15, 2019, 7:08 PM

#

EndInitializationEntityCommandBufferSystem endinti = new 
EndInitializationEntityCommandBufferSystem();
            EntityCommandBuffer ecb = endinti.CreateCommandBuffer();
            ecb.RemoveComponent<nodeToGenTag>(et);

#

ok thnx @craggy orbit but i think i got the cs part wrong hehe

raven badger Nov 15, 2019, 7:10 PM

#

cs has to be on the same line as the 3 backticks I believe

#

bool test = true

languid stirrup Nov 15, 2019, 7:12 PM

#

there you go, you are correct, the first line just needs to be the backticks and cs and the code starts from the next line

north bay Nov 15, 2019, 7:48 PM

#

Is there a way to make sure that a job component system gets the job of another system as it's dependency?

tawdry tree Nov 15, 2019, 7:50 PM

#

Why would you want to do that?
not to be rude or anything, but attempting to do so sounds like you might be doing a bad pattern

safe lintel Nov 15, 2019, 7:54 PM

#

kinda have to do it for some of the physics system queries so its already a thing

#

if you search the physics code for FinalJobHandle you can see how they implemented it

north bay Nov 15, 2019, 7:55 PM

#

I have a job which serializes the messages of a connection and another one who send the messages.

#

I can probably just put them into one system and schedule them with the other one as a dependency.

gusty comet Nov 16, 2019, 7:52 AM

#

Depends how you want to separate your code. You can also have two systems and use the UpdateBefore or UpdateAfter class attributes.

dusty scarab Nov 16, 2019, 2:35 PM

#

Is the update here?

dull copper Nov 16, 2019, 3:15 PM

#

no

dull copper Nov 16, 2019, 3:31 PM

#

I'm super curious if they finally fixed the unity physics timestepping

#

because they did use it on the upcoming shooter sample

#

and they definitely can't make networked shooter's physics dependent on rendering speed

mystic mountain Nov 16, 2019, 3:39 PM

#

@dull copper what do you mean fix physics tinestepping? Are you talking about dots physics?

#

The net sample uses simulation and render loop already.

dull copper Nov 16, 2019, 3:45 PM

#

dots physics yes

#

I think they use simulation group for it but it's ran on each update

mystic mountain Nov 16, 2019, 3:55 PM

#

You can check line 111 and forward. https://github.com/Unity-Technologies/multiplayer/blob/master/sampleproject/Assets/NetCode/ClientServerWorld.cs

dull copper Nov 16, 2019, 4:15 PM

#

I'm getting nightmares of this if endif stuff here 😄

#

there has to be cleaner way to do this

fair condor Nov 16, 2019, 5:17 PM

#

Anyone know how to get the length / byte array from a BlobBuilder or BlobAssetReference<t>?

I want to store it manually, outside of any subscene, and manually create a BlobAssetReference from its bytes:
BlobAssetReference<BlobData>.Create(bytes);

The data is in there, and the unsafe ptr is exposed, but not its length: "BlobAssetReference.m_data.header->Length" that is internal.

#

[FieldOffset(8)]
public int Length;

I could just grab it manually I guess

fair condor Nov 16, 2019, 5:53 PM

#

Current solution:

public unsafe static class BlobAssetExtensions
{
    public static Type BlobAssetHeaderType = typeof(BlobAssetReference<>).Assembly.GetType("Unity.Entities.BlobAssetHeader");
    public static FieldInfo LengthFieldInfo = BlobAssetHeaderType.GetField("Length");
    public static int LengthFieldOffset = LengthFieldInfo.GetCustomAttribute<FieldOffsetAttribute>().Value;
    public static int SizeOfHeader = Marshal.SizeOf(BlobAssetHeaderType);

    public static int GetLength<T>(this BlobAssetReference<T> reference)
        where T : struct
    {
        var ptr = IntPtr.Add(new IntPtr(reference.GetUnsafePtr()), -SizeOfHeader + LengthFieldOffset);
        return *(int*)ptr;
    }

    public static byte[] ToManagedByteArray<T>(this BlobAssetReference<T> reference)
        where T : struct
    {
        var ptr = new IntPtr(reference.GetUnsafePtr());
        var length = reference.GetLength();
        var managedArray = new byte[length];
        Marshal.Copy(ptr, managedArray, 0, length);
        return managedArray;
    }
}

plain cloak Nov 16, 2019, 6:18 PM

#

is there anyway to disable transform components getting added to entities?

safe lintel Nov 16, 2019, 8:15 PM

#

you can make a conversion system to handle it after the fact, its a little clumsy but it works

stuck hatch Nov 16, 2019, 8:18 PM

#

Hello, what can I do if my system is not visible in entity debugger?

safe lintel Nov 16, 2019, 8:18 PM

#

@plain cloak

    [UpdateAfter(typeof(LegacyBoxColliderConversionSystem))]
    [UpdateAfter(typeof(LegacyCapsuleColliderConversionSystem))]
    [UpdateAfter(typeof(LegacySphereColliderConversionSystem))]
    [UpdateAfter(typeof(LegacyMeshColliderConversionSystem))]
    [UpdateAfter(typeof(PhysicsShapeConversionSystem))]
    [UpdateAfter(typeof(LegacyRigidbodyConversionSystem))]
    public class PhysicsAdditionalConversionSystem : GameObjectConversionSystem
    {
        protected override void OnUpdate()
        {
                Entities.ForEach((RemoveVelocity removeVelocity) =>
                {
                    var entity = GetPrimaryEntity(removeVelocity.gameObject);
                    DstEntityManager.RemoveComponent<PhysicsVelocity>(entity);
                }
            );
        }
    }

RemoveVelocity is just an empty monobehaviour. someone mentioned a better way which was I think to set the entity to an archetype but I never tried it personally

#

@stuck hatch does your system not have entities to process? it wont show up if so

stuck hatch Nov 16, 2019, 8:19 PM

#

I have disabled one and an entity query which includes disabled

#

I also use World CreateSystem and I see the debugger runs into OnCreate but no OnUpdate

plain cloak Nov 16, 2019, 8:21 PM

#

@safe lintel i see, it would have been better if i could just disable it but i guess this works too. thanks

stuck hatch Nov 16, 2019, 8:32 PM

#

if I use GetEntityQuery in a system, is it correct that this defines a scope for the system?

safe lintel Nov 16, 2019, 8:40 PM

#

i think its also tied to whatever job that system also schedules

stuck hatch Nov 16, 2019, 8:54 PM

#

For some reason EntityQueryOptions.IncludeDisabled does not work, I tried with entityMgr.SetEnabled(entity, false) and entityMgr.AddComponentData(entity, new Disabled()); not both together, the query could not find the entity, now I am using EntityQueryOptions.IncludePrefab, with Prefab Component, that works

rare umbra Nov 17, 2019, 3:01 AM

#

hey guys, I posted this the other day but I'm still not able to figure out what's up.

I have 2 systems:

Vendor Transaction - Finds transactions, deducts currency from wallet component for the transaction then adds a Dead Entity component
Dead Entity Cleanup - Finds Dead Entity component entities and deletes them

When I run the code with 2 entities that have transaction components I get the following happen in sequence:
Add dead entity component to entity 1
Add dead entity component to entity 2
Add dead entity component to entity 1
Add dead entity component to entity 2
Delete entity 1
Delete entity 2

#

followed by exception: DeadComponent has already been added to the entity

#

wondering if anyone can help me? Sounds like the the request to add the component via a buffer is happening twice before the actual buffer runs, perhaps?

#

https://pastebin.com/6t7tSPCA

Pastebin

[C#] using UnityEngine; using Unity.Burst; using Unity.Collectio...

plain cloak Nov 17, 2019, 7:08 AM

#

you should exclude DeadComponent from your PurchaseQuery

#

or

#

run the dead entity cleanup some time after end simulation barrier

#

@rare umbra the problem is when vendor transaction runs you add the entity at end simulation barrier and dead entity system misses the query for the current frame. When next frame comes dead entity system queues destroy command for end simulation barrier again so vendor transaction runs again since vendor transaction component is still there. And you get 2 destroy requests for the same entity which causes the error

#

another solution is not using command buffer for destroying the entities and doing in at initialization system group or something using EntityManager batched operations. This should also be more efficient

rare umbra Nov 17, 2019, 1:11 PM

#

@plain cloak

you should exclude DeadComponent from your PurchaseQuery

I’ll probably do this, sounds pretty straightforward, thanks!

Or run the dead entity cleanup some time after end simulation barrier

Not sure how to do this tbh but I would like to know for the future. I tried having each of those systems run barriers in different steps but didn’t have much luck. Any particular examples you’d recommend trying?

tawdry tree Nov 17, 2019, 1:41 PM

#

[UpdateAfter(EndSimulationBarrier)] Or something like that.
In this case, it sounds like you want to put it on the system that does dead entity cleanup

rare umbra Nov 17, 2019, 1:59 PM

#

I’ll try that too, thanks! Won’t be in front of my PC until tonight but will let you know how it goes

#

I’ll try both but I’d rather the second fix because the frame delay is unwanted

plain cloak Nov 17, 2019, 4:56 PM

#

@rare umbra i had the same problem before and what i do is, I run DestroyDeadEntity system at InitializationSystemGroup and I use entityManager instead of command buffers. You could also use EndInitializationCommandBufferSystem aswell though.

rare umbra Nov 17, 2019, 5:12 PM

#

I think I tried to use entityManager but the compiler didn’t like it. Like it wasn’t in scope or something

#

Does entityManager need to be passed into the job?

safe lintel Nov 17, 2019, 5:30 PM

#

you can only use entitymanager on the mainthread

#

but unlike the commandbuffers, you can pass in nativearrays or queries to create or destroy entities

rare umbra Nov 17, 2019, 8:01 PM

#

I’m finding that systems are a little hard to fathom if you’re not that familiar with threading / jobs

mystic mountain Nov 17, 2019, 9:07 PM

#

I have this "maybe" problem that I have a NativeMap of an ID to entity. This entity will undergo some loading of data, and can be requested to be created by multiple entities same frame, hence I want to add it to the map to be able to check if it's created in a single threaded way. So.. to the problem is that using buffers to delay will not give me the final entityID when used, so I can't add it directly to the map, is there a way to manually remap this to the correct one at the same sync point?

onyx mist Nov 17, 2019, 9:08 PM

#

I'd love to know this too. Deferred entities are killing my brain cells

mystic mountain Nov 17, 2019, 9:12 PM

#

Hmm, I think my specific problem can be solved by simply adding a tag to the created entity to add itself to the map funny enough.

onyx mist Nov 17, 2019, 9:20 PM

#

Yup that's the workaround I ended up going with in mine

onyx mist Nov 18, 2019, 6:54 AM

#

https://puu.sh/EFSQg/98d72cebde.png

#

is there no way to add a dynamic buffer to a deferred entity like how i want to do so here

#

usually id have it so a separate job runs on the children that makes them add themselves onto the parent but this is a special case where doing that would result in a lot more work

safe lintel Nov 18, 2019, 7:07 AM

#

is childrenBuffer meant to be a buffer on the child entity from the command buffer?

#

oh wait never mind read the code again 😛

mystic mountain Nov 18, 2019, 7:11 AM

#

Don't know a way to do that no

safe lintel Nov 18, 2019, 7:12 AM

#

ok so I think to get around this you need to make another entity that acts as an event, with a component that stores the child you are creating and the entity with the buffer you want to add the child to.

#

and then another job or system that processes that event entity

onyx mist Nov 18, 2019, 7:14 AM

#

oh wow i never considered using an event entity

#

thanks baron!

safe lintel Nov 18, 2019, 7:22 AM

#

time for bed, i hope to wake up to a plethora of new dots packages! 😉

mystic mountain Nov 18, 2019, 7:49 AM

#

I don't see how much different an event entity would make over leaving a Component (to add itself) on child though.

stiff skiff Nov 18, 2019, 9:44 AM

#

The component will cause 2+ Archetype changes. The event entity will only cause 1.

mystic mountain Nov 18, 2019, 10:06 AM

#

So how is 1 entity creation and destruction vs 1 additional archetype change?

#

I don't see where the event creates an archetype change though, since you add to existing buffer. Similarly component on entity to add itself would already exist in archetype, only a set required, so only 1 archetype change on removal, which can be done on query.

golden heron Nov 18, 2019, 10:35 AM

#

anyone got experience using unity.physics?

#

im trying to figure out the best procedure for creating complex compound collider bodies that can have their colliders changed.

amber flicker Nov 18, 2019, 11:05 AM

#

Errr.. wow? https://forum.unity.com/threads/are-unity-subscenes-and-lwrp-compatible.717422/#post-5180879 - "the team is focused entirely on making HDRP + Hybrid work well; they're planning to look at URP after that, hopefully in the middle of next year"

slow epoch Nov 18, 2019, 11:10 AM

#

Wow what

#

How is hd more important than universal since universal is more needed

#

I suppose they need to improve hdrp to "sell better" unity

civic bay Nov 18, 2019, 11:32 AM

#

I have a GameObject that I convert into an entity, it has a Physics Shape and Body script attached and I added a NonUniformScale to it when I instantiate the entity, but how can I change the size of the Physics Shape? It's too big for the now scaled down entity

amber flicker Nov 18, 2019, 11:39 AM

#

Afaik physics colliders can’t scale at runtime

golden heron Nov 18, 2019, 11:41 AM

#

@amber flicker you know the best way to create physics bodies at runtime?

amber flicker Nov 18, 2019, 11:41 AM

#

sorry, not actually done anything with Unity.Physics yet - just remember reading some related forum posts

golden heron Nov 18, 2019, 11:42 AM

#

Hehe same, is all kinda contradictory tho

amber flicker Nov 18, 2019, 11:51 AM

#

still v early days.. I'm an early adopter but I think I'll still be avoiding it for the foreseeable..

dull copper Nov 18, 2019, 11:54 AM

#

I totally agree with Unity on focusing first to HDRP on Hybrid Renderer

#

actually wrote a post on that thread too now

#

I mean, I'd agree if they did it first for URP as well

#

but it does make a lot of sense trying to tackle it first for one system rather than trying to solve everything at once

#

this is what they do with DOTS anyway already, build systems iteratively

#

and they are slowly getting dots ecosystem expanded

amber flicker Nov 18, 2019, 11:57 AM

#

just feels a little contradictory to all the talk of perf by default, dots on mobile - megacity on mob etc... like, I get it. They have finite resource. Still.. 'starting to look mid next year' means another year before use. I'm also quite anxious about how divergent hdrp & urp are and when built-in will suffer from not being developed.. but that's a more tangential concern.

dull copper Nov 18, 2019, 11:57 AM

#

well

#

right now

#

if you pick latest versions

#

hybrid renderer doesn't work with anything properly

#

so wanting it to work with everything is bit of a stretch

#

I mean, people can want things, but there are realities to face here

#

they also have their reasons for doing it hdrp first vs urp first, but we wouldn't know it

#

in past they used to do lwrp support first simply because it was simpler to play around with

amber flicker Nov 18, 2019, 12:02 PM

#

As for me, I'm just disappointed that a) the RPs are fundamentally very divergent (not talking full support, just basics working), b) it will consequently take a long time before anyone can use dots on mobile and c) this is the first we're hearing of it.... but disapointment != disagreeing with their decision

slow epoch Nov 18, 2019, 12:03 PM

#

I feel like the current state of Unity is really confusing and frustrating for a lot of devs since they see all of those videos talking about DOTS being the future and all the cool things you can do with it but they end up in a in-between state of not being able of using old stuff because it doesn't work with DOTS but DOTS not working because most of it is not ready yet

dull copper Nov 18, 2019, 12:05 PM

#

yeah I guess they could be more transparent on the future predictions

slow epoch Nov 18, 2019, 12:05 PM

#

And you end up throwing away DOTS, having to implement a lot of basic stuff by yourself or just wait nonexistent release dates for your issue to get fixed

dull copper Nov 18, 2019, 12:05 PM

#

if you follow up the dev more closely, it's pretty clear most of the DOTS ecosystem will not be complete in few years

slow epoch Nov 18, 2019, 12:06 PM

#

Yeah but that's not what they say in all the talks they do

dull copper Nov 18, 2019, 12:06 PM

#

even then, people expected to have fully functional ECS editor by now

#

they do say these things are going to previews when they promo them, so it's not like they lie to users

slow epoch Nov 18, 2019, 12:07 PM

#

Well URP or LWRP is out of preview right now isn't?

dull copper Nov 18, 2019, 12:08 PM

#

LWRP is out of preview, URP isn't released yet officially

#

it's kinda weird setup

#

URP is technically out when 2019.3 releases

slow epoch Nov 18, 2019, 12:09 PM

#

Also ECS is gonna be out of preview technically in 2020.1 but since Physics for example is a different thing, we don't know if that's gonna be out of preview as well

#

Yeah but URP and LWRP is the same

#

Or i'm missing something

dull copper Nov 18, 2019, 12:09 PM

#

a lot has changed

#

like URP now has dedicated post processing

#

of course the core of it is still the same

#

but there are big changes still

slow epoch Nov 18, 2019, 12:10 PM

#

Well that's what i mean about confusing then

dull copper Nov 18, 2019, 12:10 PM

#

Entities "core" is out of preview first

#

it's not same with the whole DOTS ecosystem

#

you should totally expect dots packages still be in preview or experimental state when the entities package releases

#

I wouldn't even expect hybrid renderer to be production ready with hdrp by then

#

more like at the summer earliest

#

also would totally expect them to slip from the last roadmap estimates :p

slow epoch Nov 18, 2019, 12:15 PM

#

Yeah but my main concern is how they prioritize the different packages and the decisions they make, i mean is not wrong to make the decisions they are making since a lot of stuff is still in a very early version but, as i said, they show it to us as "look at this shiny new thing we have that you can use" and people go ahead and try to make real games with something that's not ready yet

#

The problem comes from devs for being missinformed but i feel like unity could express better the fact that all of this is still an early version a lot of can change

#

And if you want to make stuff with it you should expect redoing the same thing multiple times because the API has changed or the workflow has been modified

amber flicker Nov 18, 2019, 12:22 PM

#

I mean.. we're all battling with similar things so I hear what you're saying @slow epoch however honestly I think most devs dabbling in this stuff do know it's preview and what that can mean. I think @dull copper may feel that a lot of us are impatient about it all despite that - which I'd agree with. DOTS is clearly a huge undertaking. I also agree that it's pretty confusing right now. Even if you're very up to date with the state of everything in Unity (which is hard), choosing what technologies to use right now is actually very hard. Do I start a new mobile project using URP? Gotta think pretty darn hard I'd say. I guess we can all agree that the direction they're going is quite promising overall but the next few years are likely to be pretty tricky to navigate.

civic bay Nov 18, 2019, 12:24 PM

#

It's crazy how different DOTS is, I feel so dumb asking for help for what sound like extremely basic things, such as how to change the scale of an entity. It's so alien to me. I feel like a beginner all over again

#

Speaking of, how can I set the parent of an entity to a GameObject in the scene so when I move it, the entities move with it? Is that even possible?

hollow scroll Nov 18, 2019, 12:32 PM

#

@civic bay there is the Parent component (if your gameobject already have a child and converttoentity component this parent component is added automatically), but it's basically a parent component with the Entity ID set to the parent

civic bay Nov 18, 2019, 12:34 PM

#

Whenever I add the Parent component my entities just don't even show anymore

#

Even though the entity debugger they're spawning in

#

Nevermind they're under the map

hollow scroll Nov 18, 2019, 12:36 PM

#

if you are creating a prefab with ConvertToEntity you don't need to add the parent component

#

manually adding that is only necessary if you are parenting during runtime

trail burrow Nov 18, 2019, 12:36 PM

#

Using any of the new stuff (ecs, burst, srp, etc) for a game that actually needs a launch date and be economically viable is a huge mistake atm

hollow scroll Nov 18, 2019, 12:37 PM

#

doing that here 😛

dull copper Nov 18, 2019, 12:38 PM

#

I don't feel like SRPs present as big of a risk

#

going all in with DOTS however...

trail burrow Nov 18, 2019, 12:39 PM

#

All my tests of urp/hdrp have ended in "oh so this is still broken, ah well"

#

Every single time

civic bay Nov 18, 2019, 12:39 PM

#

@hollow scroll I'm basically spawning in a bunch of entities from the sky, and when they hit the floor I remove the physics components frmo it so they don't keep updating

#

But I need to parent them to the floor, because the floor moves

#

So I need the entities to move with the floor

hollow scroll Nov 18, 2019, 12:40 PM

#

@civic bay ah ok.. so adding parent component in that case is ok

civic bay Nov 18, 2019, 12:40 PM

#

Am I going about it the right way by adding the parent upon Instantiating the entity, but set the parent after I remove the physics components?

#

Or adding the component and setting it actually

#

At that time

#

Because it doesn't have a parent while it's falling

hollow scroll Nov 18, 2019, 12:41 PM

#

@civic bay you can add the parent component when you remove the the phsycis component that it's when you mention that needs to be parent to the ground

dull copper Nov 18, 2019, 12:41 PM

#

in my experience, if we count hybrid issues out, main things causing people pain with SRPs are just feats that are missing or don't have 3rd party asset to implement something, sure there are still tons of bugs but it's not like the built-in renderer didn't have those too

civic bay Nov 18, 2019, 12:42 PM

#

But how can I get a reference to the Floor Entity in that ComponentSystem?

dull copper Nov 18, 2019, 12:42 PM

#

hdrp is more all around package tho, you shouldn't miss that many feats with it

trail burrow Nov 18, 2019, 12:42 PM

#

@dull copper no, just stuff being broken, crashing, etc.

#

i would not say either urp or hdrp are production ready from my tests, its very easy to brake both of them

hollow scroll Nov 18, 2019, 12:43 PM

#

@civic bay you can have another query in the jobsystem that gets the ground entities, and then get the entity from that query in a job or however you prefer, and use that for the job that adds the parent component to the entities touching the ground

dull copper Nov 18, 2019, 12:43 PM

#

if talking about individual feats, I feel like shader graph itself is most fragile thing

#

then srp batcher comes next

trail burrow Nov 18, 2019, 12:43 PM

#

and thats not even counting platform specific issues i have not even bothered trying to examine, if it doesn't work flawlessly on windows, then im not even gonna attempt to run it on switch/ps4/xbox/android/ios

dull copper Nov 18, 2019, 12:43 PM

#

most things breaking for me has usually been either one

civic bay Nov 18, 2019, 12:44 PM

#

@hollow scroll Thank you for your help, much appreciated 🙂

trail burrow Nov 18, 2019, 12:45 PM

#

@dull copper i mean unity is betting everything on dots, we'll see if it pays of in 2022 😄

dull copper Nov 18, 2019, 12:46 PM

#

or 2025

#

because if they say it's ready in 2022, we all know it will not

trail burrow Nov 18, 2019, 12:46 PM

#

lol

dull copper Nov 18, 2019, 12:46 PM

#

but it's still good to have targets

trail burrow Nov 18, 2019, 12:46 PM

#

getting jaded? 😄

dull copper Nov 18, 2019, 12:47 PM

#

because with 2025 target they'd just slip further away

#

I mean, anyone who's followed Unity's scheduling and estimates know it's true.. but they usually get there eventually

#

I don't think they planned ECS core to take this long either

trail burrow Nov 18, 2019, 12:48 PM

#

my main... woudn't call it worry.. but issue/concern with all this is that the old system (GO/MB) basically seems abandoned internally at Unity, but anyone that wants to build a real game today still has to use it... but they don't seem to be updating anything relating to that anymore at all.... is this gonna go on for 2-3 years now?

dull copper Nov 18, 2019, 12:49 PM

#

anyway, this is why I'm not pissed at all at Unity for not shipping production ready packages next year for all dots feats

#

because it's just not realistic at all

#

well, technically the old system has been there for what, 14 years?

#

like, it's still going to keep working

#

they updated mono, c# and made incremental GC

#

those were the biggest wins for it

#

I don't really see point on trying to implement new stuff for the old setup at this point at all

#

would rather see them putting those resources on dots

#

obviously they will not let the old monobehaviors completely break either before they get dots done

trail burrow Nov 18, 2019, 12:53 PM

#

Yeah but you are not trying to build a game and ship? There's tons of shit that just issues going on get fixed it seems, because dots.

dull copper Nov 18, 2019, 12:53 PM

#

I am but not focusing with dots with it

#

like, there's no realistic hope on getting hybrid rendering done in time for me

#

and frankly, I don't even care about that before you get rest of the dots systems fully functional, maybe for some upcoming projects then...

languid stirrup Nov 18, 2019, 1:31 PM

#

anyone know what does this NativeFixedLengthAttribute class do?

#

Nvm. Got it to work. But still doesn’t make it blittable lol

civic bay Nov 18, 2019, 2:28 PM

#

Is there a way to get the entity ref from ConvertToEntity.ConvertAndInjectOriginal(gameObject);

hollow scroll Nov 18, 2019, 2:54 PM

#

@civic bay you can check how the guy do it here: https://youtu.be/BNMrevfB6Q0 (I think it's around minute 19:30)

civic bay Nov 18, 2019, 4:45 PM

#

Jesus christ, after 3 days of trying to understand ECS, it finally clicked

#

It's like trying to ride an inverse bike

onyx mist Nov 18, 2019, 4:46 PM

#

Congrats!

safe lintel Nov 18, 2019, 4:51 PM

#

and soon the old way will feel like the inverse bike 🙂

slow epoch Nov 18, 2019, 4:53 PM

#

"soon"

main glen Nov 18, 2019, 5:14 PM

#

anyone started a multiplayer project with dots around ?

dull copper Nov 18, 2019, 5:21 PM

#

most are probably waiting for the new packages still 😄

hollow sorrel Nov 18, 2019, 5:24 PM

#

waiting for the bike update

left oak Nov 18, 2019, 5:24 PM

#

i'm just like, trying to make awssdk play nice with dots 😩

safe lintel Nov 18, 2019, 5:44 PM

#

its enough of a struggle just doing singleplayer 😄

mystic mountain Nov 18, 2019, 6:05 PM

#

@main glen yes

winter veldt Nov 18, 2019, 6:16 PM

#

hey all

#

question: is there a specific build recommended to play with a stable(ish) release of DOTS? i know when it was ecs it seemed to break every update.

deft niche Nov 18, 2019, 6:18 PM

#

0.1.1 version of entities package with 2019.2.12f1 is as stable as it can be.

winter veldt Nov 18, 2019, 6:20 PM

#

so sticking to 2019.2? i did install the latest 2020 beta and had menu's and items and stuff i hadn't seen before. is there anywhere with actual documentation you can follow? every tut or article i find on the net seems to be from some obscure build.

deft niche Nov 18, 2019, 6:21 PM

#

2020 is not really stable.. its in alpha. 2019.3 is also in beta. 2019.2 is the latest stable version

#

Should probably wait for the new package to come out if you are just getting started

#

The APIs and workflow is going to change with the new update so its going to mess you up again with the old tutorials! 😄

winter veldt Nov 18, 2019, 6:23 PM

#

that's exactly what's been going on. i figured with the supposed stable release set for what? 2020.1 release? they would at least have solidified their workflow somewhat

deft niche Nov 18, 2019, 6:24 PM

#

Thats a tentative date. nothing is set in stone yet.

#

enjoy the preview packages for now 🙂

winter veldt Nov 18, 2019, 6:26 PM

#

yeah just assuming they'd have an idea what the finishline is looking like when they mention it. but no bother. I was looking at the DOTS-training-samples and giving them a shot, but if i have no real place to start... I don't know enough about ECS to try to blindly work it out

golden heron Nov 18, 2019, 7:08 PM

#

@amber flicker @slow epoch the ecs systems are useable on mobile now. There are a few aspects which require some imagination, but even if you just have gameobject puppets following your entities around, it improves calculation speeds.

#

I .... actually dont need a renderer on my main ecs systems tho hehe

winter veldt Nov 18, 2019, 7:08 PM

#

@golden heron what do you use ecs for? ai stuff? that's the type of thing i'm interested in

golden heron Nov 18, 2019, 7:09 PM

#

Well, first ill show an old video.

#

This is messy, from literally my first few weeks in unity.

#

https://youtu.be/QmYgpzICb5k

YouTube

Nyscersul

Universe generator, in alpha stages

▶ Play video

#

Each of those white dots is a solar system. That will be simulated on a central server, whilst players receive data and react in their own small spaces.

amber flicker Nov 18, 2019, 7:11 PM

#

@golden heron sure, there are lots of things dots can be useful for... just a shame if it doesn't cover rendering. Also unsure if dots animation package will require hybrid renderer? Animators are sometimes the bottleneck for me and would like to be able to use the dots version.

golden heron Nov 18, 2019, 7:11 PM

#

Yeah, everything would be better in dots hehe

#

But, im finding that people have... kinda missed another aspect of how to use ecs.

winter veldt Nov 18, 2019, 7:12 PM

#

yesssss! that's the stuff i like to see! backend simulations are where my mind jumps with ecs.

golden heron Nov 18, 2019, 7:12 PM

#

All the consideration of huge numbers of entities catches attention, when people could be instead creating a smaller number of complex multiple entity objects to make the game with.

winter veldt Nov 18, 2019, 7:12 PM

#

i've always been interested in trying to do world sim in the background while just rendering what's going on in the player's area... stopping the "the world is frozen, unless the player is interacting with it" most games have

golden heron Nov 18, 2019, 7:13 PM

#

Yeah, my game is intended to be a realtime universe simulation which is always ticking over irrelevant of players.

#

It'll respond to players, if trade economy is affected for example, but generally most of the systems will be in a data only mode, updating less frequently with minimal information, whilst the physics and collisions will only be considered in player systems.

#

There is another aspect of large number of entity management people forget - if you update every entity per frame, you hit your limit real quick, but if you only update your entities every other frame, and stagger them, you can almost double your ftotal entity scope.

#

Now, imagine the scope of a game which updates its background entities once every 5 seconds?

winter veldt Nov 18, 2019, 7:16 PM

#

yes! are you finding it plausible to handle that much data? can you essentially do limitless number of entities just by increasing that delay?

golden heron Nov 18, 2019, 7:17 PM

#

Well no, there is still the limit between memory available and a little overhead for the staggering, but you definitely can achieve a similar increase in useage numbers as you get from pooling in standard unity

#

I found i could run a million entities at about 25fps on my old dual core 2.2ghz - old one too, core 2 duo i think

untold night Nov 18, 2019, 7:18 PM

#

Cross-post from the forums:

Hydrogen.Entities update:
After some work and life induced delays, I have made some samples and scene setups outside of the testing environments. These samples are based on the various requests people made and each has it's own readme file that goes over the different parts of the samples:

https://github.com/periodyctom/Hydrogen.Entities/releases/tag/0.2.0-preview.3

Also bug fixes and some optimizations/minor enhancements.

GitHub

periodyctom/Hydrogen.Entities

A collection of helpers for work with Unity's ECS framework, used in our games. - periodyctom/Hydrogen.Entities

#

feedback appreciated

golden heron Nov 18, 2019, 7:19 PM

#

@untold night have you used unity.physics much?

untold night Nov 18, 2019, 7:19 PM

#

Part of my push for getting this done was to play with Physics more

winter veldt Nov 18, 2019, 7:20 PM

#

nice. that's still a lot. i was assuming i'd have to generalize things from individual units to say overall faction status when out of a specific range of the player... but sounds like it could be an increasingly large radius if i lower the update ticks

golden heron Nov 18, 2019, 7:20 PM

#

Hehe well im having trouble getting an adaptable physics body working, i need to add/remove colliders or recalculate compound colliders at runtime and it doesnt seem easy atm.

#

@winter veldt mind if i send a dm? I just finished a mk1 design you might appreciate.

untold night Nov 18, 2019, 7:21 PM

#

I believe they're working on an API for altering colliders at runtime but I don't know what the timeframe for that is

golden heron Nov 18, 2019, 7:21 PM

#

Well i guess its rebuilding afresh for now then hehe

untold night Nov 18, 2019, 7:21 PM

#

with the latest DOTS packages you can at least rebuild in a burst job

golden heron Nov 18, 2019, 7:21 PM

#

fortunately it can be a change which happens instantly

winter veldt Nov 18, 2019, 7:21 PM

#

@golden heron for sure!

golden heron Nov 18, 2019, 7:25 PM

#

@untold night could you outline what kinda helpers are in your "Hydrogen" api?

untold night Nov 18, 2019, 7:29 PM

#

There's a lot in the documentation and now in the samples, but heres a quick run-down:

A pipeline for Converting ScriptableObjects to DOTS Blob Assets, running on the back of the Game Object Conversion pipeline
A pipeline for loading Singleton ECS data components from files or scenes, originally for converting config data to make it usable in jobs/component systems.
A pipeline built on top of the other two that helps you convert ScriptableObject singleton data (as there's quite a few people who use the SO as a manager/singleton pattern) and migrating that data to ECS. Which handles a lot of the memory management and boilerplate for you.
full test coverage of the above.

prime cipher Nov 18, 2019, 7:29 PM

#

If I created a subscene, how would I be able to instantiate it in a script? Using it as a template for creating lots of similar entities, editable as a subscene.

untold night Nov 18, 2019, 7:31 PM

#

@golden heron - Documentation starts here: https://github.com/periodyctom/Hydrogen.Entities/blob/master/Documentation~/index.md

Each sample has it's own Readme:

GitHub

periodyctom/Hydrogen.Entities

A collection of helpers for work with Unity's ECS framework, used in our games. - periodyctom/Hydrogen.Entities

GitHub

periodyctom/Hydrogen.Entities

A collection of helpers for work with Unity's ECS framework, used in our games. - periodyctom/Hydrogen.Entities

GitHub

periodyctom/Hydrogen.Entities

A collection of helpers for work with Unity's ECS framework, used in our games. - periodyctom/Hydrogen.Entities

#

https://github.com/periodyctom/Hydrogen.Entities/blob/master/Samples~/ConfigFileLoading/README.md

GitHub

periodyctom/Hydrogen.Entities

A collection of helpers for work with Unity's ECS framework, used in our games. - periodyctom/Hydrogen.Entities

golden heron Nov 18, 2019, 7:38 PM

#

Nice, thanks dude

#

have you explored multiple worlds?

hollow sorrel Nov 18, 2019, 7:59 PM

#

#nasa

untold night Nov 18, 2019, 8:20 PM

#

I've not messed with multiple worlds since the earlier dots days. This currently works with the default live world and conversion world stuff.

deft niche Nov 19, 2019, 12:53 AM

#

anyone has any idea on the latest update on entities package ?

rare umbra Nov 19, 2019, 3:22 AM

#

dumb question - how do I get the entity from a component? My job is using NativeArray<PurchaseRequestComponent> but because I want to add a component to the same entity I need to grab the entity reference

#

        {
            for (int i = 0; i < PurchaseRequests.Length; i++)
            {
                var purchaseRequest = PurchaseRequests[i];

               //Need to reference the entity that purchaseRequest is attached to ```

untold night Nov 19, 2019, 3:24 AM

#

is this an IJob?

rare umbra Nov 19, 2019, 3:24 AM

#

yup

untold night Nov 19, 2019, 3:24 AM

#

how are you passing the component data to the Job in the first place? Are you using EntityManager or System Queries?

#

or are you operating with Chunks on the System level then passing to IJobs?

rare umbra Nov 19, 2019, 3:26 AM

#

        {
         All = new ComponentType[] { typeof(PurchaseRequestComponent),}
        });```

#

Not sure if this is the best way, just the way I'm currently doing it

untold night Nov 19, 2019, 3:27 AM

#

why aren't you using IJobForeachWithEntity<...> which probably fits your problem better.

Although you can get a copy of the entity array out of a query

rare umbra Nov 19, 2019, 3:27 AM

#

I'm using it in another system, not sure why I'm not here

#

lemme convert it over

#

Would it have any impact on the other data I'm trying to grab?

        public ComponentDataFromEntity<VendorOfferComponent> VendorOfferComponents;```

untold night Nov 19, 2019, 3:31 AM

#

Probably not, as long as you're not writing the same entities you're reading from concurrently with another job.

if you really need to do it in an IJob for some reason, you can use ToEntityArray:

https://docs.unity3d.com/Packages/com.unity.entities@0.0/api/Unity.Entities.EntityQuery.html?q=EntityQuery#Unity_Entities_EntityQuery_ToEntityArray_Allocator_JobHandle__

Which has both a main thread version and a version that collects the entities from the query on a thread you can then pass as a dependency to your job.

rare umbra Nov 19, 2019, 3:43 AM

#

bah, can't seem to fathom what I'm missing in the OnUpdate having switched over to IJobForEachWithEntity

untold night Nov 19, 2019, 3:44 AM

#

can you show your job signature and Execute function?

rare umbra Nov 19, 2019, 3:44 AM

#

sure, 2 secs

#

https://pastebin.com/18BMCB3h

Pastebin

[C#] public class VendorTransaction : JobComponentSystem { ...

#

InvalidOperationException: VendorTransactionJob.Data.WalletComponents is not declared [ReadOnly] in a IJobParallelFor job. The container does not support parallel writing. Please use a more suitable container type.

untold night Nov 19, 2019, 3:47 AM

#

you declare two of the job, assign the fields of one of them, then launch a blank one

#

you also need to add [ReadOnly] before the ref PurchaseRequestComponent purchaseRequest

So it should look like this:

public void Execute(Entity entity, int jobIndex, [ReadOnly] ref PurchaseRequestComponent purchaseRequest)

rare umbra Nov 19, 2019, 3:49 AM

#

so I tried to assign the fields to the second job (first one is legacy) but couldn't find the correct syntax for the assignations within the new VendorTransaction declaration

untold night Nov 19, 2019, 3:50 AM

#

as an additional optimization/change, you can schedule the Job by passing the PurchaseQuery as the parameter to the schedule instead of the system this, it will then use a hotpath to operate on the query data

#

make sure you're using the [ReadOnly] attribute from Unity.Collections and not the one from one of the System namespaces

#

https://docs.unity3d.com/ScriptReference/Unity.Collections.ReadOnlyAttribute.html

#

did that help?

rare umbra Nov 19, 2019, 3:54 AM

#

2 secs

#

it's looking better but still the same issues https://pastebin.com/FJ6RKAKB

Pastebin

[C#] public class VendorTransaction : JobComponentSystem { ...

untold night Nov 19, 2019, 4:00 AM

#

I see what the problem is

WalletComponents needs to have the attribute [DisableParalellForRestriction] assuming no other threads can access it at the same time, since you're writing to it.

You can also mark VenderOfferComponents as [ReadOnly] as well

#

you don't need to mark CommandBuffer.Concurrent as [WriteOnly] either

rare umbra Nov 19, 2019, 4:03 AM

#

I can only use
[NativeDisableParallelForRestriction]
Is that the one? the other one is throwing a compile error

#

well that works now, yay

#

can I get rid of the PurchaseQuery now that the component type is specified in the IJobForEachWithEntity?

untold night Nov 19, 2019, 4:08 AM

#

you can if you don't need the query for any other filtering, such as excluding components or the any/none fields.

What will happen is the query will get created in the background the first time you schedule the job with the system and will then use the cached Query when you schedule it every time after

rare umbra Nov 19, 2019, 4:11 AM

#

cool thanks!

#

seems to be working nicely

#

thanks for the help @untold night

orchid yoke Nov 19, 2019, 8:59 AM

#

Is it possible to access entities in a JobComponentSystem, im trying to loop through a set before starting the job but cant seem to access the entities in the OnUpdate? I tried creating a new EntityQueryBuilder but that caused a null reference.

#

        new EntityQueryBuilder().WithAll<Comp>().ForEach((Entity entity, ref Comp comp) => {
            data.Add(comp.Value);
        });

hollow sorrel Nov 19, 2019, 9:11 AM

#

i dunno about the entityquery way but you can use IJobForEachWithEntity instead of IJobForEach and pass in Entity as first param to the Execute

orchid yoke Nov 19, 2019, 9:21 AM

#

I got the Job the way I want it, I just want to populate a readonly list prior to the job executing.

prime cipher Nov 19, 2019, 9:28 AM

#

What would be the way to create shaders for a material used in RenderMesh component? From the default URP shaders, some work, some show just a flat pink. I created a simple shader (basically only color to albedo on master node) in shader graph, which results also in flat pink

orchid yoke Nov 19, 2019, 9:45 AM

#

Figured it out, IJobComponent has GetEntityQuery so when I used that it worked better!

craggy orbit Nov 19, 2019, 10:00 AM

#

@prime cipher i recently found out that PBR materials don't work with DOTS yet. you have to use Unlit shaders for now.

prime cipher Nov 19, 2019, 10:03 AM

#

@craggy orbit yes, creating an unlit shader graph asset works. Thx. So no lit shaders, no particles -> no real effects in DOTS 😦

craggy orbit Nov 19, 2019, 10:04 AM

#

yeah. definitely a bummer. but we're anticipating the next DOTS release sometime this month, or so i've heard. that might bring support

magic frigate Nov 19, 2019, 10:04 AM

#

Is .2 coming with the DOTS fps sample? I forget

mystic mountain Nov 19, 2019, 10:06 AM

#

Ugh, why is InitializationGroup not bound on same loop as Simulation x)

stiff skiff Nov 19, 2019, 10:28 AM

#

Same loop?

mystic mountain Nov 19, 2019, 10:42 AM

#

Yeah. It's run 1:1 with PresentationGroup.

remote coyote Nov 19, 2019, 11:42 AM

#

That's good to know

dull copper Nov 19, 2019, 12:23 PM

#

@magic frigate you mean the 0.2 entities or 2019.2?

#

all in all, would expect next packages to launch along with the fps sample as they've only given estimate for the fps sample and it relies on all these packages

#

and it'll be 2019.3 compatible

civic bay Nov 19, 2019, 2:47 PM

#

Is it possible to instantiate an entity inside a Job?

trail burrow Nov 19, 2019, 2:48 PM

#

only indirectly

#

via entity command buffer

civic bay Nov 19, 2019, 2:51 PM

#

@trail burrow How can I go about that?

mystic mountain Nov 19, 2019, 3:24 PM

#

@civic bay Create a commandBuffer from a CommandBufferSystem which acts as a barrier/sync point at different points in your gameloop. The usual way is to use this system as a private varaible in your system, note the system and not the commandBuffer - it needs to be created each "frame" it's used. Use in in the system "as" you would use EntityManager. If using paralell jobs, you want to use EntityCommandBuffer.Concurrent, simply .ToConcurrent(), on your buffer when passed into Job. After you've scheduled your job you have to add a dependency of the job to the commandBufferSystem (so it knows it is completed) do calling AddJobHandleForProducer.

slow epoch Nov 19, 2019, 3:32 PM

#

At which point in the gameloop are all the jobs completed?

#

At certain points like CommandBuffers, at the end of the frame?

mystic mountain Nov 19, 2019, 3:58 PM

#

Executing the commands in an EntityCommandBuffer invokes the corresponding functions of the EntityManager. Any structural change, such as adding or removing entities, adding or removing components from entities, or changing shared component values, creates a sync-point in your application. At a sync point, all Jobs accessing entity components must complete before new Jobs can start. Such sync points make it difficult for the Job scheduler to fully utilize available computing power. To avoid sync points, you should use as few entity command buffer systems as possible.

safe lintel Nov 19, 2019, 4:04 PM

#

@slow epoch a job finishes when it completes its work or if you call .Complete();, theres not a hard set time compared to barriers

mystic mountain Nov 19, 2019, 4:04 PM

#

But if you have a Destro/Create/AddComponent/RemoveComponent in your barrier all jobs will complete?

slow epoch Nov 19, 2019, 4:05 PM

#

Then a job can end up completed 2 o 3 frames after scheduling it if nobody told it to be completed?

safe lintel Nov 19, 2019, 4:05 PM

#

you know thats a good question

slow epoch Nov 19, 2019, 4:05 PM

#

Or whatever times it takes

#

I'm talking here in ECS

#

If you use JobComponentSystem

mystic mountain Nov 19, 2019, 4:06 PM

#

And if it doesn't require a Complete if it only uses SetComponent, then how does it know the dependency between jobs using that component so it have to wait for them to complete until it can set component.. hmmpf.

slow epoch Nov 19, 2019, 4:09 PM

#

I though there was some kind of point where all jobs were completed because certain jobs that don't have any kind of dependencies but can take a huge amount of time don't have a determined end point

safe lintel Nov 19, 2019, 4:10 PM

#

maybe the commandbuffer is skipped a frame if the job takes a particularly long amount of time? this would be good to test out

mystic mountain Nov 19, 2019, 4:11 PM

#

I would imagine there is a Complete at the start/end of each gameloop to start next for the JobComponentSystem jobs.

safe lintel Nov 19, 2019, 4:12 PM

#

i think multiframe jobs should be supported, i do recall reading that there were issues a long time ago regarding them(leak issues) but this was back during times of using Inject to get queries so assuming thats not the case now

slow epoch Nov 19, 2019, 4:13 PM

#

Would it be at the end or the start of each frame/gameloop?

mystic mountain Nov 19, 2019, 4:13 PM

#

Yeah, I don't know. At some point the main thread is used for jobs as well? I've no idea where that is either 😛

slow epoch Nov 19, 2019, 4:14 PM

#

I'm curious about the approach to this since i've stumbled with similar problems in the past working with only jobs

#

Not having a clear idea if they need to be completed at the end or at the beginning of the frame

#

Well, it's more like "what is the best" but i suppose as always it depends

calm dock Nov 19, 2019, 4:24 PM

#

📎 Calculate.mp4

mystic mountain Nov 19, 2019, 4:24 PM

#

I usually don't think about it, since data/entities that are dependent on each-other will sort itself out.

calm dock Nov 19, 2019, 4:25 PM

#

Can ECS can save me from that latence ?

#

When NavMeshAgent

#

try to go to other side

#

They have path one by one

#

I want them all react fast like at start of video

slow epoch Nov 19, 2019, 4:26 PM

#

That's because the pathfinding is async

#

You can use CalculatePath so it's calculated in the same frame

calm dock Nov 19, 2019, 4:26 PM

#

same mate

slow epoch Nov 19, 2019, 4:27 PM

#

CalculatePath + setting the resulting path is the same?

#

Right now there are not a lot of options for pathfinding with ecs besides NavMeshQueries which are incomplete at the moment

#

Unity said pathfinding will come for the next year

calm dock Nov 19, 2019, 4:28 PM

#

I think you are right...

#

Do you think using simple job can make it faster ?

slow epoch Nov 19, 2019, 4:29 PM

#

You can't use the current NavMesh inside jobs

#

Also you can change NavMesh.pathfindingIterationsPerFrame to your needs

#

I think is maxed at 500

safe lintel Nov 19, 2019, 4:31 PM

#

minor correction in that they said they would start work on navigation next year, who knows when a useable package will be released

calm dock Nov 19, 2019, 4:32 PM

#

Ty @slow epoch I will try

mystic mountain Nov 19, 2019, 6:10 PM

#

If I have multiple GetEntityQuery calls in my OnCreate of JobComponentSystem, what decides if the System runs it's update or not? Do the queries && , || or always update when multiple?

trail burrow Nov 19, 2019, 6:10 PM

#

|| afaik

mystic mountain Nov 19, 2019, 6:12 PM

#

Hmm, so I'll have to manually check IsEmptyIgnoreFilter or is it better to let the systems setup "empty"?

#

that looks like &&

#

Oh, so it doesn't add to the m_RequiredEntityQueries

#

Ok, but still use GetEntityQuery to create them I guess?

safe lintel Nov 19, 2019, 6:46 PM

#

how do jobs complete in relation to command buffers? if a job takes x frames to finish, I assume it can potentially skip the barrier x times too?

trail burrow Nov 19, 2019, 6:52 PM

#

@safe lintel the barrier will call .Complete() on the job handle afaik

mystic mountain Nov 19, 2019, 6:59 PM

#

It calls Complete on all handles you've added to the AddJobHandleForProducer at least.

hollow sorrel Nov 19, 2019, 6:59 PM

#

i think jobs from componentsystems will always be completed next frame, only jobs that are started outside ecs can run multiple frames

worldly pulsar Nov 19, 2019, 7:02 PM

#

@safe lintel depends on how you .Complete() the job. If you added its handle to the return value of a JobComponentSystem.Update() the job will be Completed by the next sync point (either barrier or mainthread ComponentSystem, or EntityManager operation).
If you want to have a job run over multiple frames you have to manage its handle on your own so it finishes when you Complete() it manually, barriers have nothing to say in this case (but the safety system will kick in if you do something icky)

mystic mountain Nov 19, 2019, 7:05 PM

#

@worldly pulsar Do you know where the handle is passed to the Barrier then from the JobComponentSystem?

#

    public abstract class JobComponentSystem : ComponentSystemBase
    {
        JobHandle m_PreviousFrameDependency;

        JobHandle BeforeOnUpdate()
        {
            BeforeUpdateVersioning();

            // We need to wait on all previous frame dependencies, otherwise it is possible that we create infinitely long dependency chains
            // without anyone ever waiting on it
            m_PreviousFrameDependency.Complete();

            return GetDependency();
        }

interesting...

#

So basically each system loops around it's dependency to be completed next frame.

hollow sorrel Nov 19, 2019, 7:09 PM

#

oh? does that mean that if your jobcomponentsystem runs late in the frame, it'll complete() late in the next frame as well?
thought it might complete all running jobs at the start of a frame somewhere

mystic mountain Nov 19, 2019, 7:12 PM

#

I don't fully get it though, shouldn't all systems be dependent on previous barrier since it can change the structure etc?

worldly pulsar Nov 19, 2019, 7:13 PM

#

@mystic mountain pretty sure this is just a failsafe, there is a "complete all JobComponentSystem handles" method somewhere, but I don't remember where

#

for EntityManager operations this would be EntityManager.CompleteAllJobs() (which is called from BeforeStructuralChange() )

mystic mountain Nov 19, 2019, 7:16 PM

#

But what is the point of AddJobHandleForProducer, if we still need to complete all jobs?
(edit) nvm, ofc we need to know we got all buffers..

#

But then again, we could still complete all..

worldly pulsar Nov 19, 2019, 7:20 PM

#

I'm a bit rusty on this part of the code, but if I remember correctly the CompleteAllJobs() only completes jobs returned from JobComponentSystem.Update(), so if you schedule something and don't return it from Update() (like, you have a job writing to an ECB and you want that ECB to complete at some specific barrier) you need to AddJobHandleForProducer

#

I need to read what exactly happens to the handle returned from Update(), it was always a bit magical for me to be honest

mystic mountain Nov 19, 2019, 7:31 PM

#

The only thing I can find is that it does this after it's update with the handle

        unsafe void AddDependencyInternal(JobHandle dependency)
        {
            m_PreviousFrameDependency = m_SafetyManager->AddDependency(m_JobDependencyForReadingSystems.Ptr, m_JobDependencyForReadingSystems.Length, m_JobDependencyForWritingSystems.Ptr, m_JobDependencyForWritingSystems.Length, dependency);
        }

worldly pulsar Nov 19, 2019, 7:42 PM

#

and that AddDependency inserts the jobhandle into all the related type Read/WriteFences. EntityManager.CompleteAllJobs (which is called by the EntityCommandBuffer.Playback()) goes through all Read/WriteFences and completes them

rare umbra Nov 19, 2019, 10:20 PM

#

Any news on the release @digital scarab ?

stiff skiff Nov 19, 2019, 10:24 PM

#

My safe bet now is 13th of december >_< The 2018.3 release date from last year

onyx mist Nov 19, 2019, 10:31 PM

#

no

#

I veto this idea

raven badger Nov 19, 2019, 10:34 PM

#

Seconded

onyx mist Nov 20, 2019, 3:46 AM

#

how do i set the component of a value within an icomp within an icomp? ala
commandBuffer.SetComponent(index, baby2, new Parents { Mother = entity });
https://puu.sh/EGARd/bb6af459ee.png

#

https://puu.sh/EGARv/292c1882f0.png

#

i get this error upon attempting this

#

📎 unknown.png

#

https://puu.sh/EGAYk/f1a8ddc86f.png

#

managed to get around it by doing this!

#

not sure if its optimal but hey

#

ok new question regarding the same "Family" compdata. While parents is a compdata, the others are buffers. How do I access these internal buffers? https://puu.sh/EGBdV/a6358d1c04.png Using this creates an error on the first line.
ArgumentException: A component with type:Children [B] has not been added to the entity.

#

all relevant entities definitely have the family component

#

[NativeDisableParallelForRestriction] public BufferFromEntity<Children> childrenBuffer;

#

and heres the declaration

onyx mist Nov 20, 2019, 4:44 AM

#

https://puu.sh/EGBNv/c429281a7f.png

#

thought i could be slick with this...

languid stirrup Nov 20, 2019, 4:45 AM

#

so If Entity A and Entity B. and I have A.neighboutEntity = B. Now does my system have 2 entities or a total of 3 entities?

onyx mist Nov 20, 2019, 4:46 AM

#

if a.[x] is an entity variable than you'd be passing around a reference so the system would be 2 entities

languid stirrup Nov 20, 2019, 4:48 AM

#

awesome! thnx 🙂

onyx mist Nov 20, 2019, 4:51 AM

#

np!

hollow jolt Nov 20, 2019, 6:34 AM

#

Hi i'm trying to learn ecs ( again ) looking at this sample code now:
https://github.com/Destrayon/Unity-DOTs-and-Physics-Example/blob/master/Assets/TestJob.cs

Why is he using Jobs here ? What are the benefits over the standard component system ?

GitHub

Destrayon/Unity-DOTs-and-Physics-Example

Unity Physics and DOTs implementation example. Contribute to Destrayon/Unity-DOTs-and-Physics-Example development by creating an account on GitHub.

hollow sorrel Nov 20, 2019, 6:46 AM

#

jobs are multithreaded and can use burstcompile

#

= zoomyfast

hollow jolt Nov 20, 2019, 7:20 AM

#

is there a benefit for using a job for a single entity ? Like for example there will only be one player that will have one component, system and entity ?

#

@hollow sorrel

magic frigate Nov 20, 2019, 7:22 AM

#

I guess in that case the issue would be the job overhead vs potential burst savings?

hollow jolt Nov 20, 2019, 7:24 AM

#

well yes, i wonder were to draw the line

#

like what if i have 10 unique entities

#

would they benefit using the job system ?

#

or rather should i just keep those 10 unique "things" in a classical Mono-Behaviour way ?

magic frigate Nov 20, 2019, 7:27 AM

#

I have no informed opinion but my best guess is that it depends if they have a nontrivial performance cost or not

hollow jolt Nov 20, 2019, 7:32 AM

#

@magic frigate how do you organize your scripts ? I was going for something like this.
PlayerFolder:

Player_Spawner.cs -- ( entityManager init and set data )
Player_Data.cs -- ( ECS : Component )
Player_System.cs -- ( ECS : Job Execute )

magic frigate Nov 20, 2019, 7:33 AM

#

I've mainly been reading sample stuff and trying to learn. Haven't made anything substantial enough to merit organization yet

hollow sorrel Nov 20, 2019, 8:14 AM

#

@hollow jolt yea there is a cost to scheduling a job, but no idea how much
docs state use non-job systems when The amount of work the system performs is less than the small overhead of creating and scheduling a Job.
but that doesn't give any numbers

rule of thumb i've been following is if something is so insignificant it barely even shows up on profiler (like 0.05ms), i'd put it in a regular componentsystem
simple systems with one entity usually fall under that

summer latch Nov 20, 2019, 8:43 AM

#

i've been waiting patiently for the dots multiplayer sample to drop, but then i built this over the weekend 🙂 https://github.com/gamedolphin/dots-multiplayer-sample

GitHub

gamedolphin/dots-multiplayer-sample

Contribute to gamedolphin/dots-multiplayer-sample development by creating an account on GitHub.

prime cipher Nov 20, 2019, 8:52 AM

#

What would be the best practice, if I need to run the same system for different combinations of components, inject the EntityQuery as parameter for the job or create a wrapper system per combo? This is needed, as the same system calculation needs to be parametrized per combo additionally

summer latch Nov 20, 2019, 8:54 AM

#

create separate systems. 2. create separate jobs that chain @prime cipher

remote coyote Nov 20, 2019, 9:43 AM

#

Nice nambiar!

#

thanks for sharing

hollow sorrel Nov 20, 2019, 2:25 PM

#

i feel like i'm i'm missing something

#

can someone tell me why this is causing 136 bytes of GC.Alloc (with leak detection turned off)? deep profile isn't helping either

https://hatebin.com/htimrqdcqd

#

oh and Player here is just an empty component

#

maybe it's normal and i just didn't notice it before, but other systems don't seem to have this

mint iron Nov 20, 2019, 2:47 PM

#

@hollow sorrel it might be because you're capturing an external variable within the lamda; if memory serves that causes the function to be compiled/handled differently which is probably the GC you're seeing. More info: https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/statements-expressions-operators/lambda-expressions#capture-of-outer-variables-and-variable-scope-in-lambda-expressions

Lambda expressions - C# Programming Guide

languid stirrup Nov 20, 2019, 2:55 PM

#

Guys. What’s the best way to have a linear fixed length array in an entity. Don’t want a ishared one. Cuz this array might be changing every frame. Also this array will be unique to every entity. I think dynamic buffeted array. But mine will be fixed size so still use dynamic buffer or something better is available?

hollow sorrel Nov 20, 2019, 3:00 PM

#

ah, putting the float2 in the lambda reduces it to 112 bytes

#

hmm

trail burrow Nov 20, 2019, 3:03 PM

#

@languid stirrup https://github.com/fholm/unsafecollections

GitHub

fholm/UnsafeCollections

A collection of collections for 'unsafe' C# code. Contribute to fholm/UnsafeCollections development by creating an account on GitHub.

#

specifically https://github.com/fholm/UnsafeCollections/blob/master/UnsafeCollections/Assets/UnsafeCollections/Collections/UnsafeArray.cs

GitHub

fholm/UnsafeCollections

A collection of collections for 'unsafe' C# code. Contribute to fholm/UnsafeCollections development by creating an account on GitHub.

#

you can stick an public UnsafeArray* MyArray; in a component

#

yes they are done in a C-style API, take it or leave it 😄

languid stirrup Nov 20, 2019, 3:06 PM

#

But but it’s unsafe! It says I need unsafe switch to compile it. What are the implications of this unsafe? I will have about 10k if these entities with about 800 array size.

trail burrow Nov 20, 2019, 3:07 PM

#

implications of unsafe is nothing really

languid stirrup Nov 20, 2019, 3:07 PM

#

Of int btw.

hollow sorrel Nov 20, 2019, 3:07 PM

#

@mint iron do you know if there's a way to get rid of the lambda altogether? seems entityquerybuilder isn't usable in regular componentsystems

languid stirrup Nov 20, 2019, 3:07 PM

#

Really? Will I still get detailed stacktraces for debugging?

hollow sorrel Nov 20, 2019, 3:07 PM

#

and passing a method to ForEach doesn't seem to work

trail burrow Nov 20, 2019, 3:07 PM

#

@languid stirrup lol yes

#

i mean if you try to de-reference a null pointer

#

your game will crash ofc

#

especially in burst

#

but yeah if you dont wanna use dynamic buffer

#

u dont have a choice

#

atm

mystic mountain Nov 20, 2019, 3:09 PM

#

You can also just use unsafe context and fixed array in components e.g.

unsafe struct MyData : IComponentData
{
    public fixed int data[100];
}

languid stirrup Nov 20, 2019, 3:10 PM

#

Hmmm. Either the whole entity will be disposed. But the array won’t be reassigned it anything. It wil always be accessed via its elements. And burst is cool with unsafe stuff? Does it burst still boost speeds? @trail burrow

trail burrow Nov 20, 2019, 3:10 PM

#

@mystic mountain the runtime tends to buck and choke quite hard when putting really really large structs on the stack

#

it's the one reason i tend to not use it

#

@languid stirrup the array needs to be free:ed manually

#

yes burst supports unsafe stuff

languid stirrup Nov 20, 2019, 3:11 PM

#

I don’t have a prob with dynamic buffered if they are fast and burst friendly.

trail burrow Nov 20, 2019, 3:11 PM

#

@mystic mountain you can for example make mono corrupt the stack if you push enough stuff on the stack

#

making all kinds of fun stuff happen 😄

mystic mountain Nov 20, 2019, 3:11 PM

#

I've been there x)

languid stirrup Nov 20, 2019, 3:13 PM

#

So @trail burrow buffer array good too? I want a suggestion of what is faster with burst. If it’s buffered array I’ll gladly use them.

trail burrow Nov 20, 2019, 3:13 PM

#

what's a buffered array?

#

you mean dynamic buffer?

languid stirrup Nov 20, 2019, 3:13 PM

#

Dynamic buffet array. Yes

trail burrow Nov 20, 2019, 3:14 PM

#

use whatever you want, i have never benchmarked any of them against each other

#

if you need absolute speed just do a public int* MyArray; and public int MyArrayLength; and allocate the memory by hand

#

and burst can work with that yes

languid stirrup Nov 20, 2019, 3:14 PM

#

Oh. Hmm ok. I might benchmark them then.

#

Yea but pointers are unsafe again. Lol. Thnx for the discussion @trail burrow

trail burrow Nov 20, 2019, 3:15 PM

#

yes it's 'unsafe', it's completely fine

languid stirrup Nov 20, 2019, 3:15 PM

#

I will bench and see

trail burrow Nov 20, 2019, 3:15 PM

#

all of the ECS uses unsafe code internally

languid stirrup Nov 20, 2019, 3:16 PM

#

Lol ofc. Without pointers u can’t have any proper software :p

mint iron Nov 20, 2019, 3:19 PM

#

@hollow sorrel modern c# versions should be compiling a lambda that doesn't have external references to a straight method call, they're not as nasty as they used to be. That said, Unity is doing a whole lot of stuff behind the scenes there - https://hatebin.com/akgdzsiujs. You could consider converting your code into a job.

hollow sorrel Nov 20, 2019, 3:21 PM

#

yea but docs say it's better to put things in ComponentSystem if it's smaller than scheduling job overhead

#

which i imagine would be the case for a 1-entity with just assigning a value

#

also kinda weird if gc alloc in non-job systems is by design

mint iron Nov 20, 2019, 3:23 PM

#

i vaguely recall i read an official post about in on the forums a while back that they were aware of it and intended to get rid of it before the final version.

#

i've been away for a few weeks, have they released the new entities version from Copenhagen? cause they were supposed to be changing Entities.ForEach to be compiled as a job behind the scenes.

#

also, the ToEntityArray() inside ForEach is already running a job 😄

coarse turtle Nov 20, 2019, 3:28 PM

#

Hmm I've no idea if they did

hollow sorrel Nov 20, 2019, 3:28 PM

#

whaaat

coarse turtle Nov 20, 2019, 3:28 PM

#

Been gone for a week too

hollow sorrel Nov 20, 2019, 3:28 PM

#

also no new releases no

#

at this point i wouldn't be surprised if new version is released with 2019.3 stable release

slow epoch Nov 20, 2019, 3:32 PM

#

This topic made me think, how do you translate an Attribute to an authoring class?

#

How do you compile that?

hollow sorrel Nov 20, 2019, 3:36 PM

#

@mint iron ComponentSystems run jobs too? dunno why they mentioned using it to avoid job overhead then

mint iron Nov 20, 2019, 3:36 PM

#

@hollow sorrel one option is to decompose the process used inside ToEntityArray() to have an early out when runnign the job is not nessesary, and copy the data to a persistent array rather than using temp storage. (this is older code that i think needs to be updated but shows the basic idea: https://hatebin.com/mwevdqczdp)

hollow sorrel Nov 20, 2019, 3:38 PM

#

corgothonk

coarse turtle Nov 20, 2019, 3:39 PM

#

Oo I've been wondering about creating a template that can do that

manic elbow Nov 20, 2019, 3:40 PM

#

any good ECS physics tutorials? I sorted navigation fine (for space game), but rather have actual physics for collision detection then my crazy math that I try to optimize more and more

languid stirrup Nov 20, 2019, 3:49 PM

#

So wait. For smaller tasks like shifting elements of an array or simple logic on an entity is better to be implemented in ComponentSystem and only stuff on larger array of an entity should be implemented in IJobComponentSystem?

hollow sorrel Nov 20, 2019, 3:50 PM

#

i caved and turned it into a jobsystem btw, seems no more garbage now

mint iron Nov 20, 2019, 3:51 PM

#

my interpretation of what they've been suggesting is to start out with Entities.ForEach and focus on getting your game to work; because ForEach mirrors IJobForEach it should be relatively easy to convert to jobs for performance later.

hollow sorrel Nov 20, 2019, 3:51 PM

#

also went from 0.05ms to 0.03ms which implies it's better even for small stuff but dunno how much of that is editor overhead and profiler accuraccy

onyx mist Nov 20, 2019, 3:57 PM

#

@trail burrow do those unsafe collections have an option to be stored on the heap like dynamic buffers do? My buffers can get really big and I don't want the stack to explode or anything

trail burrow Nov 20, 2019, 3:57 PM

#

@onyx mist they are all stored on the heap

#

they work like the regular .NET collections

onyx mist Nov 20, 2019, 3:58 PM

#

Oh wow that's great!

trail burrow Nov 20, 2019, 3:58 PM

#

except, only deal with structs/pointers/native mem etc. ofc

onyx mist Nov 20, 2019, 3:58 PM

#

And they show up in the debugger?

trail burrow Nov 20, 2019, 3:58 PM

#

debugger?

onyx mist Nov 20, 2019, 3:58 PM

#

The entity debugger

trail burrow Nov 20, 2019, 3:59 PM

#

no i doubt they do that

onyx mist Nov 20, 2019, 3:59 PM

#

Ah oki

glad grail Nov 20, 2019, 5:11 PM

#

hi, I have a component which has a unique identifier. Something like struct Foo { int uid; } which I use to link DOTS with another system.
Is there a quick way of finding an entity which has a specific uid in the Foo component?

Currently I have this:

protected override void OnUpdate() {
    Entities.WithAllReadOnly<Selectable>().ForEach((Entity e, ref Foo f) => {
        if (f.uid == targetUid) {
            // do stuff

Seems like there might be a better way?

#

Maybe I should keep an external dictionary of uid->Entity ?

left oak Nov 20, 2019, 5:20 PM

#

if you're finding them one at a time, a nativehashmap would do, @glad grail

pliant pike Nov 20, 2019, 6:13 PM

#

what's the best way to compare a float3 to another float3 in a job?

worldly pulsar Nov 20, 2019, 6:45 PM

#

f1.Equals(f2) or math.all(f1 == f2). Burst should produce the same code for both.

pliant pike Nov 20, 2019, 6:50 PM

#

thanks @worldly pulsar finding this stuff in the docs is kind of difficult

worldly pulsar Nov 20, 2019, 6:54 PM

#

at this point source code is better than docs tbh

pliant pike Nov 20, 2019, 6:55 PM

#

yeah except I'm no good at reading the source code

languid stirrup Nov 20, 2019, 7:01 PM

#

@worldly pulsar what about float3 == float3 ?

#

Or do I have to do math.all?

pliant pike Nov 20, 2019, 7:02 PM

#

yeah that does not work, well it doesn't work in a if, it returns a bool3

languid stirrup Nov 20, 2019, 7:02 PM

#

Oh.......

#

That somehow makes sense

dusty scarab Nov 20, 2019, 7:03 PM

#

Quick question. I understood the CodeMonkey tutorials on ECS. Can someone give me a basic idea of a project I should try and develop using ECS?

tawdry tree Nov 20, 2019, 7:07 PM

#

Counterquestion: Do you want to develop a project in ECS?

#

If so, I'd suggest something mechanically simple, like tower defense or simpler. Most arcade games (asteroids and such) would fit, too

dusty scarab Nov 20, 2019, 7:08 PM

#

Yes! I'm trying to familiarise myself with this, so i assume learning it on a basic poject would be the best way to go

safe lintel Nov 20, 2019, 7:10 PM

#

could recreate a demo unity project, so its less about coming up with new ideas and more about translating work to using ecs+jobs

worldly pulsar Nov 20, 2019, 7:10 PM

#

have a look at https://github.com/Unity-Technologies/DOTS-training-samples

GitHub

Unity-Technologies/DOTS-training-samples

Samples designed as exercises to be ported from Unity GameObjects/MonoBehaviours to Unity DOTS. - Unity-Technologies/DOTS-training-samples

tawdry tree Nov 20, 2019, 7:10 PM

#

Then my suggestion above is what I'd go for. Aside from that, you should try to make a hello world (hello cube/cubes) project if you haven't

languid stirrup Nov 20, 2019, 7:12 PM

#

Any Pure ECS handling mesh manipulation examples Apart from boids example?

dusty scarab Nov 20, 2019, 7:12 PM

#

okay thanks! I did the hello world thing initially. I'll have a look at the training samples and try some

languid stirrup Nov 20, 2019, 7:14 PM

#

Also search for Unity ECS sample and you’ll get a link to git repo of projects and it’s docs

dusty scarab Nov 20, 2019, 7:16 PM

#

Currently breaking down the ESC Physics sample

rare umbra Nov 21, 2019, 12:31 AM

#

Doh can’t find the Unite 2019 talk that has the new less boilerplate stuff. Is it ‘converting scene data to DOTS’?

safe lintel Nov 21, 2019, 12:47 AM

#

do you mean what was shown in the keynote?

rare umbra Nov 21, 2019, 1:25 AM

#

Ah yes I think it was in the keynote yes

magic frigate Nov 21, 2019, 1:26 AM

#

https://youtu.be/gyqIZP_zLtU?t=1811 Timestamp to the beginning of keynote's DOTS talk

YouTube

Unity

Unite Copenhagen 2019 Keynote

Exciting updates including Data-Oriented Tech Stack (DOTS), Unity Simulation, Scriptable Render Pipelines, multiplayer services, our new 2D tools, and much m...

▶ Play video

rare umbra Nov 21, 2019, 2:18 AM

#

Thanks!

winter veldt Nov 21, 2019, 3:15 AM

#

hey guys, quick question.. is there a way to pass LocalToWorld back to a GameObject?

coarse turtle Nov 21, 2019, 3:44 AM

#

The transformsystemgroup should have systems which copy the LocalToWorld or (TRS) matrix back to the hybridized gameObjects

#

as long as the gameObjects are converted the entities should be set up properly to sync entity data to transform gameobject data

left oak Nov 21, 2019, 3:52 AM

#

I think you want CopyTransformToGameObject

coarse turtle Nov 21, 2019, 3:53 AM

#

yep that was the system 👍

winter veldt Nov 21, 2019, 6:03 AM

#

copytransformtogameobject seems to be obsolete, it auto-adds GameObjectEntity script, which uses Transform instead of LocalToWorld, and transform no longer exists

safe lintel Nov 21, 2019, 6:21 AM

#

you need to use the actual component with conversion instead of the proxy component

mystic mountain Nov 21, 2019, 7:46 AM

#

I had a dream last night that 2019.3 was released with new updates on all dots packages... 😢

untold night Nov 21, 2019, 7:46 AM

#

I dreamed about driving a submersible.

That dream sounds better

silver dragon Nov 21, 2019, 9:34 AM

#

multiplayer repo got an update... nothing really new, just CONTRIBUTING.md, but maybe it begins 😉

#

btw. first commit from joeante...

slow epoch Nov 21, 2019, 9:49 AM

#

At this point they are teasing us

hollow sorrel Nov 21, 2019, 10:15 AM

#

it's a sign

#

time to invest in unity stock

#

i know this isn't a meme channel but it's hard to resist

#

📎 3h2bjc.png

flat talon Nov 21, 2019, 10:35 AM

#

as stoked as I am about DOTS and the road ahead, I think it will take some time to get all current devs onboard that train 🙂

#

quite a lot of devs are not too happy about the focus on dots. So hard to say what will happen to stock 😉 and they haven't gone public yet have they?

craggy finch Nov 21, 2019, 10:36 AM

#

I need help

flat talon Nov 21, 2019, 10:37 AM

#

can you be more specific? 😄

craggy finch Nov 21, 2019, 10:37 AM

#

umm

flat talon Nov 21, 2019, 10:41 AM

#

@mystic mountain Hereapplesy? 😄 (j/k)

mystic mountain Nov 21, 2019, 10:42 AM

#

#solved

flat talon Nov 21, 2019, 10:44 AM

#

What have people been using to pass on a collection of native arrays to a job? I got a case where I want to run a parallel job that each processes a native array of floats. My current plan is to copy all the arrays into one big array and have a native array of structs with offset+length data in them.. but it just feels so.. unnecessary? (and no nativearray<nativearray<float>> doesnt work)

#

With that I can use NativeDisableParallelForRestriction to allow writing at the same time into the same array since I guarantee the jobs wont alias.

mystic mountain Nov 21, 2019, 10:46 AM

#

Maybe the unsafecollections fholm posted yesterday solves your problems?

flat talon Nov 21, 2019, 10:46 AM

#

ohh I must have missed that

#

I know Unity is adding some unsafe collections too

languid stirrup Nov 21, 2019, 10:47 AM

#

@flat talon also, try using WriteOnly tag on your output array, that way burst will not have a problem multiple threads writing to the same array

flat talon Nov 21, 2019, 10:47 AM

#

unfortunately in this case I need read/write :/ since I'm adding to existing values in the array

languid stirrup Nov 21, 2019, 10:48 AM

#

and do other threads need to read from this array?

flat talon Nov 21, 2019, 10:48 AM

#

I guess I can have a separate input and output though

hollow sorrel Nov 21, 2019, 10:48 AM

#

reposting so you don't have to scroll https://github.com/fholm/UnsafeCollections

languid stirrup Nov 21, 2019, 10:48 AM

#

if not... then i suggest breaking the arrays into input array and output array

flat talon Nov 21, 2019, 10:49 AM

#

they do need to read and write, but not in the same sections.. ie one job doesnt need to read the output of another thread. So it makes sense to have two arrays for input and output

#

each job has its own section in the array that others wont touch.

I was just wondering if this is the only way to do this? Currently I need to do a bunch of copies from multiple native arrays to combine them, and after the job the same to split the big array into smaller ones. Seems.. not great 🙂

languid stirrup Nov 21, 2019, 10:50 AM

#

there are always better ways of doing things, thats why we ask others hehhe

#

are all your float array same size?

civic bay Nov 21, 2019, 10:51 AM

#

Is it possible to use GameObjectConversionUtility.ConvertGameObjectHierarchy(prefab, World.Active)); with EntityManager.CreateEntity();

languid stirrup Nov 21, 2019, 10:52 AM

#

@flat talon also another thing that makes it faster, when allocating memory to output nativearray pass it the the option of NativeOption.UninializeMemory

civic bay Nov 21, 2019, 10:52 AM

#

Like I convert the prefab on Start() but I need to create thousands of these entities

languid stirrup Nov 21, 2019, 10:52 AM

#

that way, allocation doesnt require time

civic bay Nov 21, 2019, 10:52 AM

#

If I use Instantiate it seems to take a performance hit?

#

But the prefab has the physics shape / body set up on it

#

So I need to convert it

languid stirrup Nov 21, 2019, 10:53 AM

#

well... once you have converted to Entity, then using instantiate defeats the prupose of ECS

flat talon Nov 21, 2019, 10:53 AM

#

unfortunately not all are the same size no :/

languid stirrup Nov 21, 2019, 10:53 AM

#

@civic bay you will need to add new compoents to your ocnverted object, using ECS components

civic bay Nov 21, 2019, 10:54 AM

#

But ConvertGameObjectHierarchy only converts the prefab to an entity one time

#

How do I make thousands of them?

languid stirrup Nov 21, 2019, 10:54 AM

#

and never instantiate, cuz instantiate cannot benefit from ECS

#

for loop 😄

#

best to be done in a Job i think

flat talon Nov 21, 2019, 10:54 AM

#

you can use a conversion system. There is also a way to "mass instantiate" with an array iirc

civic bay Nov 21, 2019, 10:55 AM

#

Yeah I tried to set up a job haha, didn't work well

languid stirrup Nov 21, 2019, 10:55 AM

#

and yea, there is a way to mass entitize a prefab in an array, i dont rem what syntax tho

civic bay Nov 21, 2019, 10:55 AM

#

But is using EntityManager.Instantiate not ECS?

#

Surely I shouldn't be converting 1000's of GameObjects to Entities?

hollow sorrel Nov 21, 2019, 10:56 AM

#

i think you should convert once and then you can mass instantiate a bunch of copies of that entity with a nativearray method in entitymanager

languid stirrup Nov 21, 2019, 10:56 AM

#

@civic bay read about this i think

📎 unknown.png

flat talon Nov 21, 2019, 10:57 AM

#

If you do the conversion inside of a subscene, the conversion is just run once and the result is saved in the subscene

languid stirrup Nov 21, 2019, 10:57 AM

#

yea, you only convert from a prefab ONCE, then just make an archetype of it and create an array of those entities

civic bay Nov 21, 2019, 10:58 AM

#

How do you create an archetype out of it though?

flat talon Nov 21, 2019, 10:58 AM

#

use the GetPrimaryEntity method thing.. whats it called again

mystic mountain Nov 21, 2019, 10:58 AM

#

That's what he did? I think you're confusing him with mixing archetype and prefab entity x)

civic bay Nov 21, 2019, 10:59 AM

#

So I convert the prefab on Start()

#

And then on Update I spawn 10000 entities by using EntityManager.Instantiate(ConvertedPrefabEntity)

flat talon Nov 21, 2019, 11:00 AM

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why not use a conversion system or the interface?

civic bay Nov 21, 2019, 11:00 AM

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How so?

flat talon Nov 21, 2019, 11:01 AM

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I really recommend you watch this talk :)
https://www.youtube.com/watch?v=BNMrevfB6Q0

YouTube

Unity

Converting your game to DOTS - Unite Copenhagen

In this video, learn about what's involved in migrating existing game code to the new Data-Oriented Technology Stack (DOTS), which comprises the C# Job Syste...

▶ Play video

civic bay Nov 21, 2019, 11:01 AM

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Yeah I did but he uses instantiate too?

flat talon Nov 21, 2019, 11:02 AM

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he's using the Convert() function and conversion systems, not start/update

mystic mountain Nov 21, 2019, 11:02 AM

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x)

📎 unknown.png

civic bay Nov 21, 2019, 11:03 AM

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That's what I'm doing though, doesn't he remove the Convert script later on?

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📎 unknown.png

mystic mountain Nov 21, 2019, 11:05 AM

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Would it even matter where the conversion is called from? Doing it with some ConversionSystem to add it to your Component or in Create of System, wouldn't the result be same in the end?

flat talon Nov 21, 2019, 11:05 AM

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the Convert method (from the interface) is useful when converting GO->entity one object at a time. In the case you want to do 1/n->1/n a system is generally more useful.

Btw regarding prefabs, the conversion basically creates an entity that is used as a template to create further entities of that prefab. And as above there's a way to create a ton of entities at once.

Or am I missing where you are stuck?

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@mystic mountain afaik the result is different if you use a subscene.. I dont think it would save the conversion result there if you just use start

mystic mountain Nov 21, 2019, 11:07 AM

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So instantiating a prefab from a subscene lives in the subscene as well then?

flat talon Nov 21, 2019, 11:07 AM

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Also in the Convert interface you should declare references to prefab objects, perhaps you are missing that step?

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@mystic mountain if you do it as part of the conversion flow, then yes the resulting entity is saved in the subscene asset

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This confused me a while ago, since I expected the conversion to run every time you start the game

mystic mountain Nov 21, 2019, 11:08 AM

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But if I have a spawner in my subscene that references a prefab. Will the spawned entities belong to the subscene in runtime?

flat talon Nov 21, 2019, 11:09 AM

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if the spawner isnt using the conversion flow to instantiate the prefabs then no

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however the original (converted) prefab entity will 🙂

civic bay Nov 21, 2019, 11:20 AM

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So my set up is:

Prefab Spawner -> On Start() ConvertGameObject(prefabToConvert)
prefabToConvert -> is a gameobject that has PhysicsBodyAuthoring and PhysicsShapeAuthoring scripts on it

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PrefabSpawner -> Update() -> m_entityManager.Instantiate(ConvertedPrefab)

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Is this not correct?

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I don't need to have the Convert to Entity script if I do it manually, right?

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The Prefab Spawner is just a gameobject in my scene

flat talon Nov 21, 2019, 11:21 AM

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I would use the Convert method in the Prefab Spawner, rest sounds fine

civic bay Nov 21, 2019, 11:22 AM

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and the prefabToConvert is just in my project view

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But how do I get a reference to the Entity via PrefabSpawner

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If the Prefab converts itself

flat talon Nov 21, 2019, 11:22 AM

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you could store it in an entity singleton for example

civic bay Nov 21, 2019, 11:22 AM

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But the GameObject doesn't exist in the scene

flat talon Nov 21, 2019, 11:23 AM

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some people use static fields

civic bay Nov 21, 2019, 11:23 AM

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It's just in the project folder

flat talon Nov 21, 2019, 11:23 AM

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yeah that is fine, an entity is still created that is the "template"

civic bay Nov 21, 2019, 11:24 AM

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But the prefab won't be created?

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if it doesn't exist in the scene

flat talon Nov 21, 2019, 11:24 AM

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not as a GO no

civic bay Nov 21, 2019, 11:24 AM

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So if I make a prefab and put the Convert script on

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It will convert to an entity regardless if it exists in the scene?

flat talon Nov 21, 2019, 11:25 AM

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uh no, then nothing will trigger the Convert script.. hence why that is on the PrefabSpawner GO? or is that not in the scene?

civic bay Nov 21, 2019, 11:25 AM

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That's what I mean though

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PrefabSpawner GO is on the scene

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Which just has a ref to the prefab in the folder

flat talon Nov 21, 2019, 11:25 AM

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yes that is all fine

civic bay Nov 21, 2019, 11:26 AM

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So do I still call ConvertGameObjectHierarchy?

flat talon Nov 21, 2019, 11:26 AM

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ah

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no

civic bay Nov 21, 2019, 11:26 AM

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Just put the Convert script on the entity prefab?

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And it'll somehow convert it and instantiate it as an entity?

flat talon Nov 21, 2019, 11:26 AM

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conversionSystem.GetPrimaryEntity(prefab)

civic bay Nov 21, 2019, 11:26 AM

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ooooh

flat talon Nov 21, 2019, 11:26 AM

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ok here is what you do

civic bay Nov 21, 2019, 11:26 AM

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You mean to extend from IConvert thingy

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And override Convert

flat talon Nov 21, 2019, 11:27 AM

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Implement IConvertGameObjectToEntity and IDeclareReferencedPrefabs on the PrefabSpawner monobehavior

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yes

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in the Convert() method (from the interface) you use:
conversionSystem.GetPrimaryEntity(prefabFieldFromYourBehavior)

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Then in DeclareReferencedPrefabs() you declare the reference to a prefab, so it can track it correctly

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one sec, see if I can find an example for you

civic bay Nov 21, 2019, 11:28 AM

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Thanks

flat talon Nov 21, 2019, 11:29 AM

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btw even though the prefab doesnt exist in your scene, you are still referencing it (from a folder) in your script as a GameObject type yeah?

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ie the field

civic bay Nov 21, 2019, 11:29 AM

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Yeah

flat talon Nov 21, 2019, 11:29 AM

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perfect

languid stirrup Nov 21, 2019, 11:30 AM

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anyone know how do i give a fixed lenght for dynamic buffers in the IComponent struct? or do i give it a fixed length somewhere when i initalize it?

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the entity contains this ICompoentData btw with the dynamic buffer

flat talon Nov 21, 2019, 11:31 AM

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@civic bay see the first code example in this thread, it does more or less what I mean and it saves the converted prefab entity into a component
https://forum.unity.com/threads/instantiating-prefab-entity-on-input.713846/

Unity Forum

Instantiating Prefab Entity On Input

I've had a look at the Unity ECS samples, and they show how to create an Entity from a Prefab when the scene is started, using a spawner Entity.

I'm...

civic bay Nov 21, 2019, 11:31 AM

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Thank you

flat talon Nov 21, 2019, 11:31 AM

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@languid stirrup I've never used a dynamic buffer inside an IComponent, is that even supported?

languid stirrup Nov 21, 2019, 11:32 AM

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IComponentData* and i guess so, i think lol, lemme see

flat talon Nov 21, 2019, 11:32 AM

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@civic bay Here's a blog with loads of more information if you are interested. Please not its from March so might have some outdated info
https://gametorrahod.com/gameobject-conversion-ecosystem-code-tour/

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@languid stirrup Normally a dynamic buffer is added directly to the entity (like a component), but that ofc means you can only have one of each type of buffer on entity

civic bay Nov 21, 2019, 11:33 AM

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Awesome, thanks for your help. Will have a look at them both now

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Sorry if I seem dull, I thought I got the hang of ECS, turned out I hadn't

flat talon Nov 21, 2019, 11:33 AM

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np and good luck! Also the upcoming 0.2 release will make some of this a bit easier 🙂

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no worries, Im still getting the hang of it and the damn thing keeps changing constantly!

civic bay Nov 21, 2019, 11:34 AM

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Haha, all the best buddy! 🙂

craggy finch Nov 21, 2019, 11:40 AM

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I need help in #💻┃code-beginner

hollow sorrel Nov 21, 2019, 11:41 AM

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weren't you told not to crosspost, your question has nothing to do with DOTS

languid stirrup Nov 21, 2019, 12:01 PM

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@flat talon oohhh. Yea I need one type of array. Cool. I’ll try that.

flat talon Nov 21, 2019, 12:02 PM

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you can even read buffers from other entities in a similar way you read components, getting it as an array you pass to the job

civic bay Nov 21, 2019, 12:08 PM

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Hey @flat talon quick question

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I set up the component system like in that forum and I got it spawning in my prefabs

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Should OnUpdate on my SpawnSystem : ComponentSystem be called every frame?

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At the minute it only spawns 1 prefab, I can make a for loop to spawn 100, but I want it to keep spawning forever

flat talon Nov 21, 2019, 12:09 PM

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depends on your needs? keep in mind that if you want to spawn more than 1 in a frame, instead of a loop there's a way to do that all in one call and you get back an array of entity IDs you can use to set position on etc

civic bay Nov 21, 2019, 12:10 PM

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Yeah I wanna do the 2nd option I think

flat talon Nov 21, 2019, 12:10 PM

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someone posted that command here above earlier

civic bay Nov 21, 2019, 12:11 PM

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How can I set up the component system to always update?

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Just to see how this looks first

flat talon Nov 21, 2019, 12:11 PM

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var entities = new NativeArray<Entity>(spawner.count, Allocator.Temp);
EntityManager.Instantiate(spawner.prefab, entities);

civic bay Nov 21, 2019, 12:12 PM

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but if I put 1000 in there, won't it just spawn 1000 straight away?

flat talon Nov 21, 2019, 12:12 PM

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it will update if there are entities in the query

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yes it will

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hence I asked if you need to spawn more than 1 in the same frame 😉

civic bay Nov 21, 2019, 12:12 PM

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ahh

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OKay so what I'm doing is making a pourer

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like salt

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So I need like 5 per frame

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Like every update, spawn 5 entities

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If I have

EntityManager.Instantiate(spawner.prefab, entities);```
Won't that just spawn 5 and then stop?

slow epoch Nov 21, 2019, 12:15 PM

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As far as i know, OnUpdate should be called every frame unless you modify the query from the system

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In which case it'll only be executed when there are entities matching the query

civic bay Nov 21, 2019, 12:16 PM

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That's what I was thinking, but it seems to stop after I do it

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Don't have any queries

slow epoch Nov 21, 2019, 12:16 PM

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Is the system active in the Entity Debugger?

civic bay Nov 21, 2019, 12:16 PM

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This is just for instantiating stuff

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I think it works now

slow epoch Nov 21, 2019, 12:24 PM

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What was the issue?

flat talon Nov 21, 2019, 12:25 PM

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How are you defining your system, do you even have a query set?

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btw.. since you are doing a "pourer", I've fiddled with similar system when I was doing a particle emitter. It can get a bit.. interesting where you want a consistent flow/sec but the delta time can differ 🙂 so you need to figure out how many to spawn on every update/tick based on how many are left to spawn in that time slot so to speak

plain cloak Nov 21, 2019, 12:38 PM

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does [WriteOnly] have any benefit? or is it the same as no attribute?

flat talon Nov 21, 2019, 12:39 PM

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afaik it does help the system figure out potential memory aliasing, so it can allow multiple threads writing to the same array at once

plain cloak Nov 21, 2019, 12:40 PM

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i see, thanks

civic bay Nov 21, 2019, 12:46 PM

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@slow epoch I was doing the component system inside the spawner GO

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I split everything up

flat talon Nov 21, 2019, 12:49 PM

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can you post your system? Are you setting up a query in OnCreate() or using a foreach query to run it?

civic bay Nov 21, 2019, 1:50 PM

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public class ParticleSpawnSystem : ComponentSystem
{
    int spawncount = 1000;
    int spawned = 0;

    protected override void OnUpdate()
    {
        if (EntityPrefabSingleton.Instance.Entities.Count > 0 && spawned < spawncount)
        {
            int amtToSpawn = 5;
            Entity entity = EntityPrefabSingleton.Instance.Entities[UnityEngine.Random.Range(0, EntityPrefabSingleton.Instance.Entities.Count)];
            NativeArray<Entity> entities = new NativeArray<Entity>(amtToSpawn, Allocator.Temp);

            EntityManager.Instantiate(entity, entities);

            for (int i = 0; i < entities.Length; i++)
            {
                EntityManager.AddComponent(entities[i], typeof(ParticleTag));
                EntityManager.AddComponent(entities[i], typeof(PhysicsStatus));
                EntityManager.AddComponent(entities[i], typeof(LocalToWorld));
                EntityManager.AddComponent(entities[i], typeof(RenderMesh));

                float3 spawnPositon = new float3(0, 10, 0);
                EntityManager.SetComponentData(entities[i], new Translation { Value = spawnPositon });

                EntityManager.SetComponentData(entities[i], new Rotation { Value = Quaternion.Euler(UnityEngine.Random.Range(0.0f, 360.0f), UnityEngine.Random.Range(0.0f, 360.0f), UnityEngine.Random.Range(0.0f, 360.0f)) });
                spawned++;
            }

            entities.Dispose();
        }
    }
}

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@flat talon

flat talon Nov 21, 2019, 1:51 PM

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that is a component system with no entity query, so not surprising it doesnt call Update every frame 🙂

civic bay Nov 21, 2019, 1:51 PM

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It is called every frame 😛

flat talon Nov 21, 2019, 1:52 PM

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then Im confused, and I thought you said somewhere above it wasnt?

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anyways, you got things working then? 🙂

civic bay Nov 21, 2019, 1:53 PM

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Oh yeah it wasn't working because I got lazy and put everything was inside my MonoBehavior script that converted the prefabs

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So because I had the Convert to Entity script on, it was destroying the GO and the Glitter Spawn would only run once before it was destroyed

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But now I've split it out into separated .cs files, it's working now haha

flat talon Nov 21, 2019, 1:54 PM

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generally a component system is supposed to process a set of components, and not be "open ended" like that one. For example you could create it to query for Spawner entities in your world, and for each one you would spawn new entities

civic bay Nov 21, 2019, 1:55 PM

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Well when I convert my prefabs, I do dstManager.AddComponentData(entity, new ParticleTag)

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So should I have an Entity Query in my component system (the spawner) that just contains Particle Tag?

flat talon Nov 21, 2019, 1:56 PM

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that is the particle, the system you pasted here is really the spawning logic.. so it would query for and process each emitter/spawner

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The ParticleTag is on the entities you are spawning "from the emitter"

civic bay Nov 21, 2019, 1:57 PM

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Ah so I should add a component to my spawner entity?

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Or did I read that wrong

flat talon Nov 21, 2019, 1:57 PM

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What is the spawner entity at the moment?

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I assume you are tracking that in EntityPrefabSingleton.Instance.Entities.Count ?

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By having a component on it and making the system respond to a query for that component, you can remove the usage of "EntityPrefabSingleton.Instance.Entities.Count"

civic bay Nov 21, 2019, 1:58 PM

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No, that's just a singleton to keep a reference to the converted prefabs to entities

flat talon Nov 21, 2019, 1:58 PM

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ah ok

civic bay Nov 21, 2019, 1:58 PM

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I have 3 particle prefabs that I emit from this spawner

flat talon Nov 21, 2019, 1:58 PM

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So your "prefab spawner" is just a gameobject holding a reference to the prefab, but is never converted into an entity?

civic bay Nov 21, 2019, 1:59 PM

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The spawner has the Convert to Entity script on it, but set to Inject GameObject

flat talon Nov 21, 2019, 1:59 PM

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If you change that into what I suggested above, then you can support multiple spawners at once

civic bay Nov 21, 2019, 1:59 PM

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Only need 1

flat talon Nov 21, 2019, 1:59 PM

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ok then place a component (with relevant info like spawnrate) on the spawner entity, or a tag if you dont need any data

civic bay Nov 21, 2019, 2:00 PM

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And then on the spawn system, add that tag to the entity query?

flat talon Nov 21, 2019, 2:00 PM

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yes

civic bay Nov 21, 2019, 2:00 PM

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Brilliant, I'll do that now

flat talon Nov 21, 2019, 2:01 PM

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it would result in about the same as what you have now, but with a bit more flexibility. But can be more easily extended, ie support more than 1 and you can have data on it like spawnrate and even keep what prefab to spawn on that component instead of the singleton

civic bay Nov 21, 2019, 2:01 PM

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Ahh i understand it now!

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Thank you so much for this btw

flat talon Nov 21, 2019, 2:02 PM

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np

winter veldt Nov 21, 2019, 2:16 PM

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alright, still not sure how to pass localtoworld back to transform. all copytransformtogameobject gets me is a Transform component attached instead of localtoworld, which i can't find anywhere

flat talon Nov 21, 2019, 2:24 PM

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I think it depends on whether the object being converted has a parent or not? I think I remember reading that somewhere

winter veldt Nov 21, 2019, 2:25 PM

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no parent, just trying to have a go move around so i can attach a camera to it

flat talon Nov 21, 2019, 2:33 PM

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oh you're writing data from entities back to GOs? I think Joa recently commented on that on the forums, that the conversion workflow wasnt really meant for that

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I believe they are even going to remove some of the old stuff there to support that

winter veldt Nov 21, 2019, 2:34 PM

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i see. well i'm just at a loss of how to set up a camera in pure ecs then. i was hoping to not have to write my own thing.

flat talon Nov 21, 2019, 2:35 PM

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I've seen ECS code manipulating the camera

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I believe it was on the main thread though, not in a job

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lets see what 0.2 will offer, their plan is to be able to convert all object types into entities

winter veldt Nov 21, 2019, 2:37 PM

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oh if i don't make it a job i can just edit GO's directly? i.. didn't think that was supposed to happen.

slow epoch Nov 21, 2019, 2:37 PM

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There wasn't back in the old days something like IJobTransform?

flat talon Nov 21, 2019, 2:37 PM

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actually yeah

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Jobs can use TransformAccessArray