Unity ECS Physics how to use CollisionFilter , RaycastHit [RESLVED]

hi everyone.
1) is there a way to set a detailed CollisionFilter layers for a RaycastInput ?
eg : belongsto Projectile , Collides with Players,Environment, Destructables ...

Code (CSharp):

1.  
2.                 // RayCast Input
3.                 RaycastInput input = new RaycastInput()
4.                 {
5.                      Start = projectileData.lastFramePosition,
6.                      End = translation.Value,
7.                      Filter = CollisionFilter.Default // Standard Filter
8.                 };
9.  

2) how can i get The Collider Layer from a RaycastHit ?

 

What's stopping you setting the filter layer?

Code (CSharp):

1. Filter = new CollisionFilter
2. {
3.     BelongsTo = 0xffffffff,
4.     CollidesWith = this.settings.ObserverLayer,
5.     GroupIndex = 0,
6. },
7.  

You can get the layer of the objects you hit from the Collider

Code (CSharp):

1.             for (var i = 0; i < hits.Length; i++)
2.             {
3.                 var body = bodies[hits[i]];
4.                 var filter = body.Collider->Filter

(this requires unsafe context)

 

how can i set muliple layers for the CollidesWith field?
eg i want to specify that my projectile can collide with multiple layers.

where di you find these api ?
the official documentation is outdated.

 

I don't really read documentation so I can't say if it exists there. I just read the source code.

As for your question about layers, CollidesWith is a mask field. 0xffffffff is just the hex code for everything.

If you only want layer 1 or 2 (and not layer 0) for example you could just use

Code (CSharp):

1. CollidesWith = 1u << 1 | 1u << 2,

It's very similar to regular LayerMasks

https://docs.unity3d.com/ScriptReference/Physics.Raycast.html

Except it's a uint

Code (CSharp):

1.         // Bit shift the index of the layer (8) to get a bit mask
2.         int layerMask = 1 << 8;
3.  
4.         // This would cast rays only against colliders in layer 8.
5.         // But instead we want to collide against everything except layer 8. The ~ operator does this, it inverts a bitmask.
6.         layerMask = ~layerMask;

 

Thanks a lot @tertle !!!

 

Or just use something like this https://jacksondunstan.com/articles/5126 that makes setting complex masks easy.

I map Unity layers to Unity.Physics layers a lot.

Code (csharp):

1.  
2. public static CollisionFilter LayerMaskToFilter(LayerMask mask)
3.         {
4.             CollisionFilter filter = new CollisionFilter()
5.             {
6.                 BelongsTo = (uint)mask.value,
7.                 CollidesWith = (uint)mask.value
8.             };
9.             return filter;
10.         }
11.  
12.         public static CollisionFilter LayerToFilter(int layer)
13.         {
14.             if (layer == -1)
15.             {
16.                 return CollisionFilter.Zero;
17.             }
18.  
19.             BitArray32 mask = new BitArray32();
20.             mask[layer] = true;
21.  
22.             CollisionFilter filter = new CollisionFilter()
23.             {
24.                 BelongsTo = mask.Bits,
25.                 CollidesWith = mask.Bits
26.             };
27.             return filter;
28.         }
29.  

 

thank you!
it's easy of use ^^