Question Raycast child collider does not hit

Hello, I have a game where the player moves around a limited zone. The floor is divided into grids (Empty GameObject with box colliders with "is trigger" activated) and I need to throw a ray from my player to the floor so I know the grid where he is but the ray is not hitting any collider.
These grids are child of an empty GameObject (even no collider) only to move them together but all have the same layer ("Region").
Here is my code where I throw the ray:

Code (CSharp):

1.  
2. int region = -1;
3. RaycastHit hit;
4. LayerMask regionLayer = LayerMask.NameToLayer("Region");
5. Vector3 raycastOrigin = new Vector3(player.transform.position.x, player.transform.position.y + 2.0f, player.transform.position.z);
6.  
7. if (Physics.Raycast(raycastOrigin, -player.transform.up , out hit, Mathf.Infinity, regionLayer))
8. {
9.           region = int.Parse(hit.collider.gameObject.name);
10. }

Any ideas of what is happening?

Note 1: My physics configuration allow rays to interact with trigger colliders
Note 2: I cant use OnTriggerEnter to know where the user is, thats why I use Raycast to the floor.

 

UPDATE:
If I use:

Code (CSharp):

1. RaycastHit[] hits =  Physics.RaycastAll(raycastOrigin, -player.transform.up, Mathf.Infinity);

with no layermask, it returns the collider, but I need to filter by the layermask and the layer is well asigned.

 

That was de solution! Thanks!