Camera.cullingMask

Description

This is used to render parts of the Scene selectively.

If the GameObject's layerMask AND the camera's cullingMask is zero then the game object will be invisible from this camera. See Layers for more information.

See Also: camera component.

using UnityEngine;

public class ExampleClass : MonoBehaviour
{
    Camera cam;

    void Start()
    {
        // Only render objects in the first layer (Default layer)
        cam.cullingMask = 1 << 0;
    }
}