Resolved How do I raycast in an old state of the world inside a job running for several frames?

I'm still new to Entities and thought the SSCCE below would work:

Code (CSharp):

1. public class MyTestComponent : UnityEngine.MonoBehaviour {
2.  
3.     private MyTest job;
4.     private Unity.Jobs.JobHandle handle;
5.  
6.     void FixedUpdate() {
7.         handle.Complete();
8.         Unity.Physics.Systems.BuildPhysicsWorld buildPhysicsWorld = Unity.Entities.World.DefaultGameObjectInjectionWorld.GetExistingSystem<Unity.Physics.Systems.BuildPhysicsWorld>();
9.         job.cw = buildPhysicsWorld.PhysicsWorld.CollisionWorld;
10.         handle = Unity.Jobs.IJobParallelForExtensions.Schedule<MyTest>(job, 500, 50);
11.     }
12.  
13. }
14.  
15. public struct MyTest : Unity.Jobs.IJobParallelFor {
16.     [Unity.Collections.ReadOnly]
17.     public Unity.Physics.CollisionWorld cw;
18.     public void Execute(int index) {
19.         //do nothing for now, planning to do cw.CastRay()
20.     }
21. }

However I'm getting:

InvalidOperationException: The previously scheduled job MyTest reads from the NativeArray MyTest.cw.m_Bodies. You must call JobHandle.Complete() on the job MyTest, before you can deallocate the NativeArray safely.

If I move

handle.Complete();

to the end of FixedUpdate() everything works but not if have it in the beginning like I need. I want to have units in my game raycast their vision from their predicted future positions next keyframe, then simply apply the vision when the keyframe is reached. That's why I need to raycast an old state of the world for several frames, it can't just finish on the same frame.

How am I supposed to do this?
Do I need to call some kind of "make permanent copy" method instead of using

.PhysicsWorld.CollisionWorld

?

 

I think CollisionWorld.Clone() is what you need in your example. Let me know if it works for you!

 

@petarmHavok: That hit the spot, thank you! Working code below.

Code (CSharp):

1. public class MyTestComponent : UnityEngine.MonoBehaviour {
2.  
3.     private MyTest job;
4.     private Unity.Jobs.JobHandle handle;
5.  
6.     void FixedUpdate() {
7.         OnDestroy();  //modified line
8.         Unity.Physics.Systems.BuildPhysicsWorld buildPhysicsWorld = Unity.Entities.World.DefaultGameObjectInjectionWorld.GetExistingSystem<Unity.Physics.Systems.BuildPhysicsWorld>();
9.         job.cw = buildPhysicsWorld.PhysicsWorld.CollisionWorld.Clone();  //modified line
10.         handle = Unity.Jobs.IJobParallelForExtensions.Schedule<MyTest>(job, 500, 50);
11.     }
12.  
13.     void OnDestroy() {  //new method
14.         handle.Complete();
15.         job.cw.Dispose();
16.     }
17.  
18. }
19.  
20. public struct MyTest : Unity.Jobs.IJobParallelFor {
21.     [Unity.Collections.ReadOnly]
22.     public Unity.Physics.CollisionWorld cw;
23.     public void Execute(int index) {
24.         //do nothing for now, planning to do cw.CastRay()
25.     }
26. }