Question Physics.CheckSphere does not detect any objects on the layer.

Code (CSharp):

1. public Vector2 GridSize;
2.     public float CellSize;
3.     public LayerMask CollisionLayer;
4.  
5.     Vector2 ZeroPosition;
6.  
7.     void Start()
8.     {
9.         ZeroPosition = new Vector2((transform.position.x - GridSize.x), (transform.position.x - GridSize.y));
10.     }
11.  
12.     void OnDrawGizmos()
13.     {
14.         Gizmos.color = Color.green;
15.         Gizmos.DrawWireCube(transform.position, new Vector3(GridSize.x, GridSize.y, 0));
16.         Gizmos.color = Color.red;
17.         for (float i = 0; i < GridSize.x; i+=0.75f)
18.         {
19.             for (float j = 0; j < GridSize.y; j+=0.75f)
20.             {
21.                 if(Physics.CheckSphere(new Vector3((ZeroPosition.x + 0.375f) + i, (ZeroPosition.y - 0.375f) - j, 0), CellSize, CollisionLayer))
22.                 {
23.                     Gizmos.DrawWireCube(new Vector3((ZeroPosition.x + 0.375f) + i, (ZeroPosition.y - 0.375f) - j, 0), new Vector3(CellSize, CellSize, 0));
24.                 }
25.             }
26.         }
27.     }

The layer "CollisionLayer" has objects in it, but the Physics.CheckSphere does not detect them. What is the problem? (Box Collider is placed on objects)

 

Ok, I found a solution. Use when facing a problem.

Code (CSharp):

1.     public Vector2 GridSize;
2.     public float CellSize;
3.     public LayerMask CollisionLayer;
4.  
5.     Vector2 ZeroPosition;
6.  
7.     void Start()
8.     {
9.         ZeroPosition = new Vector2((transform.position.x - GridSize.x), (transform.position.x - GridSize.y));
10.     }
11.  
12.     void OnDrawGizmos()
13.     {
14.         Gizmos.color = Color.green;
15.         Gizmos.DrawWireCube(transform.position, new Vector3(GridSize.x, GridSize.y, 0));
16.         Gizmos.color = Color.red;
17.         for (float i = 0; i < GridSize.x; i+=0.75f)
18.         {
19.             for (float j = 0; j < GridSize.y; j+=0.75f)
20.             {
21.                 RaycastHit2D Hit;
22.                 Hit = Physics2D.Raycast(new Vector2((ZeroPosition.x + 0.375f) + i, (ZeroPosition.y - 0.375f) - j), transform.up, 0.2f, CollisionLayer);
23.                 if (Hit.collider != null)
24.                 {
25.                     Gizmos.DrawWireCube(new Vector3((ZeroPosition.x + 0.375f) + i, (ZeroPosition.y - 0.375f) - j, 0), new Vector3(CellSize, CellSize, 0));
26.                 }
27.             }
28.         }
29.     }

 

Your original problem was using Physics.CheckSphere instead of Physics2D.OverlapCircle. The two physics engines are completely separate.