Resolved CastRay in IJobParallelFor Problem (Slice may not be used on a restricted range array)

I was trying to have parallel jobs that use the CastRay function. While doing so I got an error that read "Slice may not be used on a restricted range array".

I'm not sure if I'm using the interface wrong.

Here is the Code that is causing the issue:

Code (CSharp):

1.  
2. using UnityEngine;
3. using Unity.Entities;
4. using Unity.Mathematics;
5. using Unity.Physics;
6. using Unity.Physics.Systems;
7. using Unity.Collections;
8. using Unity.Jobs;
9.  
10. public class RayCastTest : MonoBehaviour
11. {
12.  
13.     static RayCaster rayCaster;
14.  
15.     void Start()
16.     {
17.         rayCaster = new RayCaster();
18.     }
19.  
20.     public struct RayCastJob : IJobParallelFor
21.     {
22.         public float3 from;
23.         public float3 to;
24.         public CollisionWorld collisionWorld;
25.  
26.         public void Execute(int index)
27.         {
28.             rayCaster.Raycast(from, to, collisionWorld);
29.         }
30.     }
31.  
32.     void Update()
33.     {
34.         if (Input.GetMouseButton(0))
35.         {
36.             BuildPhysicsWorld buildPhysicsWorld = World.DefaultGameObjectInjectionWorld.GetExistingSystem<BuildPhysicsWorld>();
37.             CollisionWorld collisionWorld = buildPhysicsWorld.PhysicsWorld.CollisionWorld;
38.  
39.             UnityEngine.Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
40.  
41.             float rayDistance = 10000f;
42.  
43.             RayCastJob job = new RayCastJob();
44.             job.from = ray.origin;
45.             job.to = ray.direction * rayDistance;
46.             job.collisionWorld = collisionWorld;
47.  
48.             JobHandle handle = job.Schedule(2, 1);
49.  
50.             handle.Complete();
51.         }
52.     }
53. }
54.  

Code (CSharp):

1.  
2. using UnityEngine;
3. using Unity.Entities;
4. using Unity.Mathematics;
5. using Unity.Physics;
6.  
7. public class RayCaster : MonoBehaviour
8. {
9.     public void Raycast(float3 fromPosition, float3 toPosition, CollisionWorld collisionWorld)
10.     {
11.         Unity.Physics.RaycastInput input = new Unity.Physics.RaycastInput()
12.         {
13.             Start = fromPosition,
14.             End = toPosition,
15.             Filter = new CollisionFilter()
16.             {
17.                 BelongsTo = ~0u,
18.                 CollidesWith = ~0u,
19.                 GroupIndex = 0,
20.             }
21.         };
22.  
23.         Unity.Physics.RaycastHit hit = new Unity.Physics.RaycastHit();
24.  
25.         bool haveHit = collisionWorld.CastRay(input, out hit);
26.  
27.         if (haveHit)
28.         {
29.             Debug.Log("Something was hit...");
30.         }
31.         else
32.             Debug.Log("Nothing hit...");
33.     }
34. }
35.  

The error is on line

bool haveHit = collisionWorld.CastRay(input, out hit);

The error's call stack is:

Code (CSharp):

1. ArgumentException: Slice may not be used on a restricted range array
2. Parameter name: array
3. Unity.Collections.NativeSlice`1[T]..ctor (Unity.Collections.NativeArray`1[T] array, System.Int32 start, System.Int32 length) (at <82ec470c913149358ad0c83ad628910c>:0)
4. Unity.Collections.NativeSlice`1[T]..ctor (Unity.Collections.NativeArray`1[T] array) (at <82ec470c913149358ad0c83ad628910c>:0)
5. Unity.Collections.NativeSlice`1[T].op_Implicit (Unity.Collections.NativeArray`1[T] array) (at <82ec470c913149358ad0c83ad628910c>:0)
6. Unity.Physics.CollisionWorld.CastRay[T] (Unity.Physics.RaycastInput input, T& collector) (at Library/PackageCache/com.unity.physics@0.3.2-preview/Unity.Physics/Collision/World/CollisionWorld.cs:201)
7. Unity.Physics.QueryWrappers.RayCast[T] (T& target, Unity.Physics.RaycastInput input, Unity.Physics.RaycastHit& closestHit) (at Library/PackageCache/com.unity.physics@0.3.2-preview/Unity.Physics/Collision/Queries/Collidable.cs:105)
8. Unity.Physics.CollisionWorld.CastRay (Unity.Physics.RaycastInput input, Unity.Physics.RaycastHit& closestHit) (at Library/PackageCache/com.unity.physics@0.3.2-preview/Unity.Physics/Collision/World/CollisionWorld.cs:197)
9. RayCaster.Raycast (Unity.Mathematics.float3 fromPosition, Unity.Mathematics.float3 toPosition, Unity.Physics.CollisionWorld collisionWorld) (at Assets/RayCaster.cs:29)
10. RayCastTest+RayCastJob.Execute (System.Int32 index) (at Assets/RayCastTest.cs:29)
11. Unity.Jobs.IJobParallelForExtensions+ParallelForJobStruct`1[T].Execute (T& jobData, System.IntPtr additionalPtr, System.IntPtr bufferRangePatchData, Unity.Jobs.LowLevel.Unsafe.JobRanges& ranges, System.Int32 jobIndex) (at <82ec470c913149358ad0c83ad628910c>:0)

Help would be appreciated. Thanks.

 

Hi @JamesPardue , could you please try adding a [ReadOnly] attribute to the collisionWorld field in RayCastJob?

Here are some threads about casting from DOTS Physics subforum that might help:
https://forum.unity.com/threads/inv...ionworld-castray-and-fixed-time-step.1024702/
https://forum.unity.com/threads/error-when-using-raycast-in-parallelfor.997742/
https://forum.unity.com/threads/restricted-ijobparallelfor-exception-during-raycast-call.1021462/

 

@milos85miki Seems that was what I was missing. I'm no longer getting the error. Thanks for the help.