Question Problem with creating PhysicsCollider and adding it to entity

Hi, I got a problem with using PhysicsCollider with entity.
I created PhysicsCollider by mesh info and Added the PhysicsCollider Component to entity.
When I debug it, collider was sucessfully created , no errors, but I can't find PhysicsCollider component
at EntityDebugger. Here's my Code & EntityDebugger window.

Code (CSharp):

1. public NativeArray<float3> meshPoints_list;
2. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3. private void MakeBrick()
4. {
5. meshPoints_list = new NativeArray<float3>(cursorMesh.vertices.Length, Allocator.TempJob);
6.             CreateColliderJob createColliderJob = new CreateColliderJob()
7.             {
8.                 Id = cursorBrickInfo._id,
9.                 e = entity,
10.                 points = meshPoints_list
11.             };
12.             JobHandle jobHandle = createColliderJob.Schedule();
13.             jobHandle.Complete();
14.             meshPoints_list.Dispose();
15. }
16. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
17. struct CreateColliderJob : IJob
18.         {
19.             public int Id;
20.             public Entity e;
21.             public NativeArray<float3> points;
22.             public void Execute()
23.             {
24.                 EntityCommandBuffer commandBuffer = new EntityCommandBuffer(Allocator.Temp);
25.                
26.                 BlobAssetReference<Unity.Physics.Collider> collider = Unity.Physics.ConvexCollider.Create(points, default, Unity.Physics.CollisionFilter.Default);
27.                 Unity.Physics.PhysicsCollider physicsCollider = new Unity.Physics.PhysicsCollider { Value = collider };
28.                 if (collider.IsCreated)
29.                 {
30.                     Debug.Log($"physics collider validity {physicsCollider.IsValid}");
31.                     commandBuffer.SetComponent(e, physicsCollider);
32.                 }
33.                 commandBuffer.Dispose();
34.             }
35.         }

Appreciate!

 

Hey, I think that the commandBuffer's actions haven't executed before you deleted it, you basically just stored commands in a buffer which should be executed at a later point in time, but deleted the buffer before they got the chance to execute properly.
To fix this, initialize a command buffer before the job, fill it with commands inside a job, and finally call

commandBuffer.Playback(EntityManager)

after the job completed.

 

Thanks my hero. it works!
btw, I have another problem with displaying collider of entities!




It was just fine to add PhyscisDebugDisplayData component to entity at first, but the error occurred from 2nd entity.
Do you happen to know why i can't display collider on editor??

 

That component serves as a global setting that enables drawing of various physics related information, meaning that it is expected to be a singleton, and you shouldn't have 2 of them in the scene. You also shouldn't attach that component to a physics entity, since if the entity gets destroyed, it's component also goes away, and you will lose drawing functionality.
What you should do is create a empty object in the editor, attach

PhysicsDebugDisplayAuthoring

component to it, and select what you want to be drawn. In order to see what is being drawn, turn on Gizmos, either in Scene or Game tabs.
It's worth noting that functionality that draws physics information related to a single entity doesn't exist, meaning if you tick 'Draw Collider Edges', they will be drawn for all colliders that are attached to entities.
Hope this helps!

 

You're so professional! Thank you so much!

 

Wish there would have been a note in the docs for the PhysicsDebugDisplayAuthoring component and the Physics manual about that. Took me hours to find out why nothing was drawn.

 

For anyone discovering this thread and not understanding why their physics collider isn't being created - you need to also add a

PhysicsWorldIndex

shared component.

Seems the best way to debug these sorts of things is by going through the sample code