Question How to run ICollisionEventsJob on only certain collision layers

I'm trying to write a system which updates a unit when it touches the ground. I have a huge number of entities in my scene that I do not want to check, but I don't know a way to not iterate over them in an ICollisionEventJob.

Here is my job:

Code (CSharp):

1. public struct UpdateGroundedTagJob : ICollisionEventsJob {
2.     public ComponentDataFromEntity<TerrainTag> terrainTags;
3.     public ComponentDataFromEntity<MovableComponent> movableComponents;
4.     public ComponentDataFromEntity<GroundedTag> groundedTags;
5.     public EntityCommandBuffer ECB;
6.  
7.     public void Execute(CollisionEvent collisionEvent) {
8.         var entityA = collisionEvent.EntityA;
9.         var entityB = collisionEvent.EntityB;
10.  
11.         var isBodyAGrounded = groundedTags.HasComponent(entityA);
12.         var isBodyBGrounded = groundedTags.HasComponent(entityB);
13.  
14.         var isBodyATerrain = terrainTags.HasComponent(entityA);
15.         var isBodyBTerrain = terrainTags.HasComponent(entityB);
16.  
17.         if (isBodyATerrain && isBodyBTerrain) {
18.             return;
19.         }
20.  
21.         var isBodyAMovable = movableComponents.HasComponent(entityA);
22.         var isBodyBMovable = movableComponents.HasComponent(entityB);
23.  
24.         if ((isBodyATerrain && !isBodyBMovable) || (isBodyBTerrain && !isBodyAMovable)) {
25.             return;
26.         }
27.  
28.         var selectedUnit = isBodyATerrain ? entityB : entityA;
29.         MovableComponent movableComponent = movableComponents[selectedUnit];
30.         movableComponent.framesSinceGrounded = 0;
31.         movableComponents[selectedUnit] = movableComponent;
32.  
33.         if (isBodyAGrounded || isBodyBGrounded) {
34.             return;
35.         }
36.  
37.         ECB.AddComponent<GroundedThisFrameTag>(selectedUnit);
38.         ECB.AddComponent<GroundedTag>(selectedUnit);
39.     }
40. }

And my code which runs the job:

Code (CSharp):

1. protected override void OnUpdate() {
2.         var ecb = endFixedECBSystem.CreateCommandBuffer();
3.        
4.         var job1 = new UpdateGroundedTagJob {
5.             terrainTags = GetComponentDataFromEntity<TerrainTag>(),
6.             movableComponents = GetComponentDataFromEntity<MovableComponent>(),
7.             groundedTags = GetComponentDataFromEntity<GroundedTag>(),
8.             ECB = ecb,
9.         };
10.        
11.         //Figure out if we can do this in parallel.
12.         var job1Dep = job1.Schedule(stepPhysicsWorld.Simulation, JobHandle.CombineDependencies(this.Dependency, stepPhysicsWorld.FinalSimulationJobHandle));
13.         job1Dep.Complete();
14.  
15.         endFixedECBSystem.AddJobHandleForProducer(job1Dep);
16.         this.Dependency = JobHandle.CombineDependencies(job1Dep, stepPhysicsWorld.FinalSimulationJobHandle);
17.     }

Is there a way to make this job only iterate over entities which belong to a specific collision layer?
Thanks!

 

I don't think this is possible. But this part of the physics system really makes you write some horrible looking code. All trigger/collision response pairs will have to be iterated over to find/process the ones you are interested in.

Someone from unity gave an example and I have not encountered anyway to do this more cleanly.

https://forum.unity.com/threads/how-do-i-detect-collisions.1257156/