How to combine two or more layers in Physics2D.OverlapCircle

Unity Engine
1

I’m using Physics2D.OverlapCircle to know if the player is grounded or not. If “isGrounded” it’s true, the animations plays, the player can jump, etc. However, I need to have more layers in the layerMask (the ground and platform layers), but I don’t know how to combine them so that the program knows that I want “isGrounded” to be true when the player it’s stepping on the ground or a platform layer. Here is my code:

[Space]
[Header("Ground check variables")]
public Transform groundCheck;
public LayerMask groundLayer;
public LayerMask platformLayer;
public bool isGrounded;
public float groundCheckRadius;

void Grounded()
    {
        var groundCollider = Physics2D.OverlapCircle(groundCheck.position, groundCheckRadius, groundLayer); // groundLayer is where I need to combine more layers
        isGrounded = groundCollider != null;
    }

Any hint in the right direction or documentation is really appreciated!

2

You can just select multiple layers in the inspector.

1 Like
3

Maybe use LayerMask.GetMask?

Physics2D.OverlapCircle(groundCheck.position, groundCheckRadius, LayerMask.GetMask("Ground", "Platform"));

Btw, here 's an extension for excluding layers.

        public static int GetMaskWithout(params string[] layerNames)
        {
            var excludeMask = LayerMask.GetMask(layerNames);
            return GetMaskWithout(excludeMask);
        }

        public static int GetMaskWithout(int excludeMask)
        {
            var everyLayer = ~0;
            return (everyLayer &= (~excludeMask));
        }
1 Like
4

As above, you only need a single LayerMask. A layer mask is a mask where each bit is a single layer so it is already set-up to select multiple layers. Presumably you selected the ground-layer in the inspector, just select the platform layer too.

1 Like
5

Thanks!