Question RayCast Inside IJobEntity

I'm getting error when calling CastRay from within IJobEntity. What is the proper way to call it? When I CastRay from ISystem it works just fine.

Error

Code (CSharp):

1. InvalidOperationException: The previously scheduled job ProjectileControlJob reads from the UNKNOWN_OBJECT_TYPE ProjectileControlJob.JobData.CollisionWorld.EntityBodyIndexMap. You must call JobHandle.Complete() on the job ProjectileControlJob, before you can write to the UNKNOWN_OBJECT_TYPE safely.

Job

Code (CSharp):

1. [BurstCompile]
2.     public partial struct ProjectileControlJob : IJobEntity
3.     {
4.         public float DeltaTime;
5.         public EntityCommandBuffer.ParallelWriter ECB;
6.         [ReadOnly] public CollisionWorld CollisionWorld;
7.  
8.         [BurstCompile]
9.         private void Execute(
10.             [EntityIndexInQuery] int index,
11.             ProjectileAspect projectileData,
12.             RefRW<LocalTransform> localTransform,
13.             RefRO<CollisionFilterData> collisionFilterData,
14.             Entity projectileEntity)
15.         {
16.             /* Calculate position-related values */
17.             ProcessCollisions(position, nextPosition, collisionFilter);
18.             /* Move projectile if not collided */
19.         }
20.  
21.         [BurstCompile]
22.         private bool ProcessCollisions(float3 from, float3 to, CollisionFilter collisionFilter)
23.         {
24.             var input = new RaycastInput
25.             {
26.                 Start = from,
27.                 End = to,
28.                 Filter = collistionFilter
29.             };
30.             if (!CollisionWorld.CastRay(input, out var hit)) return false;
31.             Debug.Log("Collided");
32.             return true;
33.         }
34.     }

System

Code (CSharp):

1. [BurstCompile]
2.         public void OnUpdate(ref SystemState state)
3.         {
4.             var ecb = SystemAPI
5.                 .GetSingleton<BeginInitializationEntityCommandBufferSystem.Singleton>()
6.                 .CreateCommandBuffer(state.WorldUnmanaged)
7.                 .AsParallelWriter();
8.             var dt = SystemAPI.Time.fixedDeltaTime;//DeltaTime;
9.             var builder = new EntityQueryBuilder(Allocator.Temp).WithAll<PhysicsWorldSingleton>();
10.             var singletonQuery = state.EntityManager.CreateEntityQuery(builder);
11.             var collisionWorld = singletonQuery.GetSingleton<PhysicsWorldSingleton>().CollisionWorld;
12.             state.Dependency = new ProjectileControlJob {DeltaTime = dt, ECB = ecb, CollisionWorld = collisionWorld}.ScheduleParallel(state.Dependency);
13.             singletonQuery.Dispose();

 

Make sure to include state.Dependency to the specified ECBSystem via AddJobHandleForProducer.
Also, disabling burst / job safetly should provide better error description.

 

You shouldn’t. Getting ECB Singleton already handle dependencies automatically. You only need AddJobHandleForProducer if you access non-singleton ECB system.

 

You shouldn’t create query and all that burden in OnUpdate. You should just directly call:

SystemAPI.GetSingleton<PhysicsWorldSingleton>()

, because you’re working in ISystem, code I see in OnUpdate for getting physics world seems copy-paste from doc samples, but it’s for calling it from MB land, and comments for that sample specify that in system you don’t need that.

 

That helped, thanks a lot!