Can't get raycasts to work (solved)

I have pure ECS physics world created from converted default boxes. Everything collides as it should but raycasts never hit anything.

The ray is correct and should collide.

Lets start with RaycastInput. The CollisionFilter.Default should work for the raycast, right?

Code (CSharp):

1.  
2.             var raycast = new RaycastInput
3.             {
4.                 Ray = new Unity.Physics.Ray(new float3(1, 10, 1), new float3(0, -1, 0)),
5.                 Filter = CollisionFilter.Default,
6.             };
7.             Debug.Log("this executes");
8.             if (RaycastService.Raycast(raycast, ref hit, ref entity))
9.             {
10.                 Debug.Log("this never executes");
11.                 Entities.ForEach((ref PointerCollision c) =>
12.                 {
13.                     c.Position = hit.Position;
14.                 });
15.             }

Raycast itself:

Code (CSharp):

1.  
2.     [BurstCompile]
3.     public struct RaycastJob : IJobParallelFor
4.     {
5.         [ReadOnly] public CollisionWorld world;
6.         [ReadOnly] public NativeArray<RaycastInput> inputs;
7.         public NativeArray<RaycastHit> results;
8.  
9.         public unsafe void Execute(int index)
10.         {
11.             RaycastHit hit;
12.             world.CastRay(inputs[index], out hit);
13.             results[index] = hit;
14.         }
15.     }
16.  
17.     public static JobHandle ScheduleBatchRayCast(CollisionWorld world, NativeArray<RaycastInput> inputs, NativeArray<RaycastHit> results)
18.     {
19.         JobHandle rcj = new RaycastJob
20.         {
21.             inputs = inputs,
22.             results = results,
23.             world = world
24.         }.Schedule(inputs.Length, 5);
25.         return rcj;
26.     }
27.  
28.     public static bool Raycast(RaycastInput input, ref RaycastHit hit, ref Entity e)
29.     {
30.         var world = World.Active.GetExistingSystem<Unity.Physics.Systems.BuildPhysicsWorld>().PhysicsWorld.CollisionWorld;
31.         var raycasts = new NativeArray<RaycastInput>(1, Allocator.TempJob);
32.         var hits = new NativeArray<RaycastHit>(1, Allocator.TempJob);
33.         raycasts[0] = input;
34.         var handle = ScheduleBatchRayCast(world, raycasts, hits);
35.         handle.Complete();
36.         hit = hits[0];
37.         raycasts.Dispose();
38.         hits.Dispose();
39.         if (world.NumBodies > 0 && hit.Fraction > 0 && hit.RigidBodyIndex != 0)
40.         {
41.             e = world.Bodies[hit.RigidBodyIndex].Entity;
42.             return true;
43.         }
44.         return false;
45.     }

I don't know how to check if raycast had hit anything so instead I just bet on the fact that

hit.Fraction == 0

will pretty much only happen when there was no hit.

 

Hi, In Unity Physics, second parameter of Ray is not actually "direction" but "offset". So you should create Ray like this:

Ray(startPosition, endPosition - startPosition)

See https://forum.unity.com/threads/unity-physics-discussion.646486/page-2#post-4341355

 

as @Kichang-Kim says you aren't including any distance so your rays are only travelling 1 unit

Code (CSharp):

1. Ray = new Unity.Physics.Ray(new float3(1, 10, 1), new float3(0, -1, 0) * distance)

If you read the documentation

Also the documentation sample snippet

Code (CSharp):

1.            Ray = new Ray()
2.            {
3.                Origin = RayFrom,
4.                Direction = RayTo - RayFrom
5.            },

 

Thank you so much, guys, that was the issue.

 

The ray in the latest package uses the term Displacement instead of Direction, which is less ambiguous. https://docs.unity3d.com/Packages/com.unity.physics@0.6/api/Unity.Physics.Ray.html .