Physics queries writes to collisionWorld.m_Bodies and Entities.ForEach => 0.5

This is a follow up to https://forum.unity.com/threads/invalidoperationexception-the-previously-scheduled-job.682744/. I decided to start a new thread with a better description and a slightly updated focus.

If i need physics queries i usually add these dependencies to run the queries after the physics world is completed:

Code (CSharp):

1. [UpdateAfter(typeof(BuildPhysicsWorld))]
2.  
3. JobHandle.CombineDependencies(inputDeps, _buildPhysicsWorld.FinalJobHandle)

This part works fine.

Though the queries (e.g. collisionWorld.CastRay) write to collisionWorld.m_Bodies and so start my problems, like this:

Code (CSharp):

1. InvalidOperationException: The previously scheduled job PlayerSpawnSystem:Job reads from the NativeArray Job.Data.collisionWorld.m_Bodies. You are trying to schedule a new job BipedCharacterMovementSystem:<>c__DisplayClass_Move_LambdaJob0, which writes to the same NativeArray (via <>c__DisplayClass_Move_LambdaJob0.Data.collisionWorld.m_Bodies). To guarantee safety, you must include PlayerSpawnSystem:Job as a dependency of the newly scheduled job.

With the old IJobForEach i could add [ReadOnly] (Old code still in PlayerSpawnSystem:Job):

Code (CSharp):

1. [ReadOnly] public CollisionWorld collisionWorld;

With the new Entities.ForEach() < 0.5 i did this:

Code (CSharp):

1. .WithReadOnly(collisionWorld)

The entities >= 0.5 prevents this due to

Code (CSharp):

1. error DC0034: Entities.WithReadOnly is called with an argument collisionWorld of unsupported type Unity.Physics.CollisionWorld. It can only be called with an argument that is marked with [NativeContainerAttribute].

My questions:

1. Why does a query writes to the m_Bodies container?
2. How can i use queries in Entities.ForEach() >= 0.5 with collisionWorld set to readonly?

 

As a workaround for CollisionWorld as a readonly I'm using this:

Code (CSharp):

1.  
2. class TestSystem : ... {
3.     struct CollisionWorldRO {
4.         [ReadOnly]
5.         public CollisionWorld CollisionWorld;
6.     }
7.  
8.     ... OnUpdate(...) {
9.         var collisionWorldRO = new CollisionWorldRO {
10.             CollisionWorld = ...
11.         };
12.         ... Entities
13.             .ForEach((...) => {
14.                     collisionWorldRO.CollisionWorld
15.             })
16.             ...;
17. }
18.  

I'm on mobile so sorry to not be more precise with the code.

Edit: accidentally hit publish before finishing typing

[]'s

 

Uh nice, that works Thanks!