Raycast and collision with entities without rigidbodies

I have a parallel job in which I'd like to detect which Entities I hit. Not all entities will have rigidbodies so the following isn't so useful.

Code (CSharp):

1. Entity e = physicsWorldSystem.PhysicsWorld.Bodies[hit.RigidBodyIndex].Entity

My job looks something like:

Code (CSharp):

1.         [BurstCompile]
2.         struct ProjectilePhysicsRayJob : IJobForEach<Translation, Projectile>
3.         {
4.             public NativeArray<Unity.Physics.RaycastHit> raycastResultsInJob;
5.             [ReadOnly] public Unity.Physics.CollisionWorld collisionWorldInJob;
6.             public float deltaTime;
7.  
8.             public void Execute([ReadOnly] ref Translation position, ref Projectile projectile)
9.             {
10.                 Unity.Physics.RaycastInput raycastInput = new Unity.Physics.RaycastInput
11.                 {
12.                     Start = position.Value,                  
13.                     End = position.Value + (projectile.velocity * deltaTime),
14.                     Filter = Unity.Physics.CollisionFilter.Default
15.                 };
16.  
17.                 if (collisionWorldInJob.CastRay(raycastInput, out Unity.Physics.RaycastHit hit))
18.                 {
19.                     raycastResultsInJob[projectile._tempIdx] = hit;
20.                 }
21.             }
22.         }

How can I determine which Entities and/or meshes where hit?

 

Unity.Physics raycasts can only hit entities which have a PhysicsCollider component (a.k.a. becomes a rigid body). They include an index of that rigid body in the hit. The bodies stores the entity it was created from. So in your example just do:

Code (csharp):

1. Entity hitEntity = collisionWorldInJob.Bodies[hit.RigidBodyIndex].Entity;

 

So, they do have a PhysicsCollider which gets added automatically from the Collider on the parent gameobject when ConvertGameObjectHierarchy(prefab.gameObject, conversionSettings) is called followed by

Code (CSharp):

1.  Entity entity = entityManager.Instantiate(prefabEntity);

If I create a cube in scene attach a ConvertToEntity and PhysicsShape (no rigidbody), Unity.Physics Raycast works fine. Just not when I instantiate in code.

 

This sounds similar to you issues in this post? https://forum.unity.com/threads/con...ting-it-at-runtime-with-unity-physics.787988/
You don't have a sample repro of the problem I could drop into the sample project do you?

 

I'll try to build a repro. Been battling issues on multiple fronts with Unity.Physics and DOTS in general.