Create a collider from a mesh in ECS/DOTS?

Does anyone know how to create a collider from a mesh in ECS/DOTS?
I want to create a 2Dmap collider from a mesh
Here what I've got so far but I didn't get it working at the moment

Code (CSharp):

1. EntityManager entityManager = World.DefaultGameObjectInjectionWorld.EntityManager;
2.         EntityArchetype entityArchetype = entityManager.CreateArchetype(
3.             typeof(Translation),
4.             typeof(Rotation),
5.    
6.             typeof(PhysicsCollider),
7.             typeof(PhysicsMass),
8.             typeof(PhysicsVelocity),  
9.             typeof(PhysicsDamping),
10.             typeof(PhysicsGravityFactor)
11.         );
12.    
13.         Entity entity = entityManager.CreateEntity(entityArchetype);
14.    

Then I got a mesh from my geometry and convert to vertices and triangles to NativeArray

Code (CSharp):

1.  
2.         NativeArray<float3> vertexBuffer = new NativeArray<float3>(mesh.vertices.Length,Allocator.Temp);
3.         NativeArray<int3> trianglesBuffer = new NativeArray<int3>(mesh.triangles.Length,Allocator.Temp);
4.         for(int i = 0; i<mesh.vertices.Length;i++)
5.         {
6.             vertexBuffer[i] = new float3(mesh.vertices[i].x,mesh.vertices[i].y,mesh.vertices[i].z);
7.         }
8.         for(int i = 0; i<mesh.triangles.Length;i++)
9.         {
10.             trianglesBuffer[i] = mesh.triangles[i];
11.         }
12.         var vertices = new NativeArray<float3>(vertexBuffer, Allocator.Temp);
13.         var triangles = new NativeArray<int3>(trianglesBuffer, Allocator.Temp);
14.        
15.         //Position
16.         entityManager.SetComponentData(entity,
17.             new Translation
18.             {
19.                 Value = new float3(0,0,0)
20.             });
21.  
22.         BlobAssetReference<Unity.Physics.Collider> colliderReference =                        Unity.Physics.MeshCollider.Create(vertices,triangles,CollisionFilter.Default);
23.         //Physics
24.         entityManager.SetComponentData(entity, new PhysicsCollider { Value = colliderReference });
25.    
26.         var mass = PhysicsMass.CreateKinematic(MassProperties.UnitSphere);
27.         entityManager.SetComponentData(entity, mass);
28.    
29.         entityManager.SetComponentData(entity, new PhysicsVelocity()
30.         {
31.             Linear = float3.zero,
32.             Angular = float3.zero
33.         });
34.         entityManager.SetComponentData(entity, new PhysicsDamping()
35.         {
36.             Linear = 1.0f,
37.             Angular = 0.05f
38.         });
39.         entityManager.SetComponentData(entity, new PhysicsGravityFactor()
40.         {
41.             Value = 0f
42.         });
43.  
44.  

Please help

 

Anyone find any solution or documentation for this?

 

Can you try this? @VrTechEx

Code (CSharp):

1. vertices = new NativeArray<float3>(mesh.vertices.Length, Allocator.TempJob);
2. for (int i = 0; i < mesh.vertices.Length; i++)
3. {
4.     vertices[i] = mesh.vertices[i];
5. }
6.  
7. triangles = new NativeArray<int3>(mesh.triangles.Length / 3, Allocator.TempJob);
8. for (int i = 0; i < mesh.triangles.Length / 3; i += 3)
9. {
10.     int3 tmp = new int3
11.     {
12.         x = mesh.triangles[i],
13.         y = mesh.triangles[i + 1],
14.         z = mesh.triangles[i + 2]
15.     };
16.     triangles[i / 3] = tmp;
17. }

 

Here is my system for slapping a PhysicsCollider on anything with a RenderMesh.

Code (CSharp):

1. Entities
2.             .WithStructuralChanges()
3.             .WithAll<ApplyMeshCollider>()
4.             .ForEach((Entity E, in RenderMesh RM) => {
5.  
6.                 NativeArray<BlobAssetReference<Unity.Physics.Collider>> BlobCollider = new NativeArray<BlobAssetReference<Unity.Physics.Collider>>(1, Allocator.TempJob);
7.                 NativeArray<float3> NVerts = new NativeArray<Vector3>(RM.mesh.vertices, Allocator.TempJob).Reinterpret<float3>();
8.                 NativeArray<int> NTris = new NativeArray<int>(RM.mesh.triangles, Allocator.TempJob);
9.  
10.                 CreateMeshColliderJob CMCJ = new CreateMeshColliderJob{ MeshVerts = NVerts, MeshTris = NTris, BlobCollider = BlobCollider };
11.                 CMCJ.Run();
12.  
13.                 EntityManager.AddComponentData(E, new PhysicsCollider { Value = BlobCollider[0] });
14.                 NVerts.Dispose();
15.                 NTris.Dispose();
16.                 BlobCollider.Dispose();
17.  
18.                 EntityManager.RemoveComponent<ApplyMeshCollider>(E);
19.  
20.             }).Run();

And here is the job it uses.

Code (CSharp):

1.     [BurstCompile]
2.     public struct CreateMeshColliderJob : IJob {
3.  
4.         [ReadOnly] public NativeArray<float3> MeshVerts;
5.         [ReadOnly] public NativeArray<int> MeshTris;
6.         public NativeArray<BlobAssetReference<Unity.Physics.Collider>> BlobCollider;
7.  
8.         public void Execute() {
9.  
10.             NativeArray<float3> CVerts = new NativeArray<float3>(MeshVerts.Length, Allocator.Temp);
11.             NativeArray<int3> CTris = new NativeArray<int3>(MeshTris.Length / 3, Allocator.Temp);
12.  
13.             for (int i = 0; i < MeshVerts.Length; i++) { CVerts[i] = MeshVerts[i]; }
14.             int ii = 0;
15.             for (int j = 0; j < MeshTris.Length; j += 3) {
16.                 CTris[ii++] = new int3(MeshTris[j], MeshTris[j + 1], MeshTris[j + 2]);
17.             }
18.  
19.             CollisionFilter Filter = new CollisionFilter { BelongsTo = 1, CollidesWith = 1 << 1, GroupIndex = 0 };
20.  
21.             BlobCollider[0] = Unity.Physics.MeshCollider.Create(CVerts, CTris, Filter);
22.             CVerts.Dispose();
23.             CTris.Dispose();
24.  
25.         }
26.     }

It isn't optimized, but hopefully this will be helpful.