LayerMask

1. // Turn on the bit using an OR operation:
2. private void Show() {
3. camera.cullingMask |= 1 << LayerMask.NameToLayer("SomeLayer");
4. }
5. 

6. // Turn off the bit using an AND operation with the complement of the shifted int:
7. private void Hide() {
8. camera.cullingMask &= ~(1 << LayerMask.NameToLayer("SomeLayer"));
9. }
11. // Toggle the bit using a XOR operation:
12. private void Toggle() {
13. camera.cullingMask ^= 1 << LayerMask.NameToLayer("SomeLayer");
14. }

출처 : http://answers.unity3d.com/questions/348974/edit-camera-culling-mask.html