DOTS Physics Raycast not returning some Entities

Unity Engine
1

Hey everyone. I’m running into an issue with raycasts on pure entities. The raycasts work fine on converted game objects but for entities that I generate purely in code I cannot get a hit. Here is the code for creating the entity:

private void CreateStarEntity()
    {
        NativeArray<Entity> entityArray = new NativeArray<Entity>(numSystems, Allocator.Temp);
        entityManager.CreateEntity(starArchetype, entityArray);

        for (int i = 0; i < entityArray.Length; i++)
        {
            //SetSeed();
            UnityEngine.Material mat = SetStarMaterial();
            Entity entity = entityArray[i];
            if (spiralGalaxy)
            {
                int armChance = UnityEngine.Random.Range(0, 100);
                if(armChance > spiralConcentration)
                {
                    entityManager.SetComponentData(entity, new Translation
                    {
                        Value = GetRandomFloat3()
                    });
                }
                else
                {
                    int arm = UnityEngine.Random.Range(0, spiralArms);

                    entityManager.SetComponentData(entity, new Translation
                    {
                        Value = GetRandomSpiralFloat3(arm)
                    });
                }
               
            }
            else
            {
                entityManager.SetComponentData(entity, new Translation
                {
                    Value = GetRandomFloat3()
                });
            }
           
           
            entityManager.SetSharedComponentData(entity, new RenderMesh { mesh = starMesh, material = mat });
            entityManager.SetComponentData(entity, new Scale { Value = SetScale(mat)});
            entityManager.SetName(entity, "Bob");
        }
        entityArray.Dispose();
    }

    private void CreateStarArchetype()
    {
        entityManager = World.DefaultGameObjectInjectionWorld.EntityManager;
        starArchetype = entityManager.CreateArchetype(
            typeof(CelestialObjectComponent),
            typeof(StarComponent),
            typeof(Translation),
            typeof(PhysicsCollider),
            typeof(Scale),
            typeof(Rotation),
            typeof(RenderMesh),
            typeof(RenderBounds),
            typeof(LocalToWorld)
            );
    }

And here is the RayCast:

private Entity Raycast()
    {
        float raydistance = 100000f;
        UnityEngine.Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        float3 fromPosition = ray.origin;
        float3 toPosition = ray.direction * raydistance;
        BuildPhysicsWorld buildPhysicsWorld = World.DefaultGameObjectInjectionWorld.GetExistingSystem<BuildPhysicsWorld>();
        CollisionWorld collisionWorld = buildPhysicsWorld.PhysicsWorld.CollisionWorld;
        RaycastInput raycastInput = new RaycastInput
        {
            Start = fromPosition,
            End = toPosition,
            Filter = new CollisionFilter
            {
                BelongsTo = ~0u,
                CollidesWith = ~0u,
                GroupIndex = 0,
            }
        };
        Unity.Physics.RaycastHit raycastHit = new Unity.Physics.RaycastHit();
        if(collisionWorld.CastRay(raycastInput, out raycastHit))
        {
            Entity hitEntity = buildPhysicsWorld.PhysicsWorld.Bodies[raycastHit.RigidBodyIndex].Entity;
            return hitEntity;
        }
        else
        {
            return Entity.Null;
        }
    }

What am I missing?

2

Please note that this is for classic physics (physx/Box2D). The DOTS physics forum is here.

1 Like
3

Ah, good point, thanks!