LayerMask.value

public int value ;

Description

Converts a layer mask value to an integer value.

using UnityEngine;

public class Example : MonoBehaviour
{
    // Casts a ray using the layer mask,
    // which can be modified in the inspector.

    LayerMask mask = -1;
    void Update()
    {
        if (Physics.Raycast(transform.position, transform.forward, 100, mask.value))
        {
            Debug.Log("Hit something");
        }
    }
}