Resolved Broadphase:PrepareStaticBodyDataJob as a dependency

Hi,
I starting with raycasts using the example from https://docs.unity3d.com/Packages/com.unity.physics@1.0/manual/collision-queries.html

New to DOTS/ECS/Physics I never worked with older versions so my knowledge/experience is only entities 1.0 and physivs 1.0

Implementing the raycast example in an ISYSTEM system I came to the following.

Code (CSharp):

1. [BurstCompile]
2. public struct RaycastJob : IJobParallelFor
3. {
4.     [ReadOnly] public CollisionWorld world;
5.     [ReadOnly] public NativeArray<RaycastInput> inputs;
6.     public NativeArray<RaycastHit> results;
7.     [BurstCompile]
8.     public unsafe void Execute(int index)
9.     {
10.         RaycastHit hit;
11.         world.CastRay(inputs[index], out hit);
12.         results[index] = hit;
13.     }
14. }
15. [UpdateInGroup(typeof(AfterPhysicsSystemGroup))]    // <=== Don't know if this is correct
16. [BurstCompile]
17. partial struct RayCastSystem : ISystem
18. {
19.     private CollisionWorld world;
20.     private NativeArray<RaycastInput> inputs;
21.     private NativeArray<RaycastHit> results;
22.     [BurstCompile]
23.     public void OnCreate(ref SystemState state)
24.     {
25.     }
26.     [BurstCompile]
27.     public void OnDestroy(ref SystemState state)
28.     {
29.     }
30.     [BurstCompile]
31.     public void OnUpdate(ref SystemState state)
32.     {
33.         world = SystemAPI.GetSingleton<PhysicsWorldSingleton>().CollisionWorld;
34.         inputs = new NativeArray<RaycastInput>(1, Allocator.TempJob);
35.         results = new NativeArray<RaycastHit>(1, Allocator.TempJob);
36.         inputs[0] = new RaycastInput()
37.         {
38.             Start = float3.zero,
39.             End = new float3(1f, 1f, 1f),
40.             Filter = new CollisionFilter()
41.             {
42.                 BelongsTo = ~0u,
43.                 CollidesWith = ~0u, // all 1s, so all layers, collide with everything
44.                 GroupIndex = 0
45.             }
46.         };
47.         JobHandle rcj = new RaycastJob
48.         {
49.             inputs = inputs,
50.             results = results,
51.             world = world
52.         }.Schedule(inputs.Length, 4);
53.         rcj.Complete();
54.     }
55. }

Running with this system I get the error :

Code (CSharp):

1. InvalidOperationException: The previously scheduled job Broadphase:PrepareStaticBodyDataJob writes to the UNKNOWN_OBJECT_TYPE PrepareStaticBodyDataJob.FiltersOut. You are trying to schedule a new job RaycastJob, which reads from the same UNKNOWN_OBJECT_TYPE (via RaycastJob.world.Broadphase.m_StaticTree.BodyFilters). To guarantee safety, you must include Broadphase:PrepareStaticBodyDataJob as a dependency of the newly scheduled job.

I have seen a thread on this but that is on older versions and the solutions from that I cannot get working in the 1.0 versions.


Anyone had the same/similar issue and know a solution ?

 

Hi,

Try putting this as your first line in OnUpdate

Code (CSharp):

1. state.EntityManager.CompleteDependencyBeforeRO<PhysicsWorldSingleton>();

 

Yes, That works, thanks.

A I also found that starting the job with :

Code (CSharp):

1.         state.Dependency = new RaycastJob
2.         {
3.             inputs = inputs,
4.             results = results,
5.             world = world
6.  
7.         }.Schedule(inputs.Length, 4, state.Dependency);

Checking actual cast results now.

(And learning more on dependencies between systems )