Dynamically change Camera Culling Mask

Anyone know of a way to dynamically change your Camera's culling mask so that it equals 2 layers? As usual the documentation is pretty sparse in this matter https://docs.unity3d.com/ScriptReference/Camera-cullingMask.html
I've created 2 new layers, ActiveView and IdleView and assigned my Scene gameObjects accordingly. When I transition from IdleView to ActiveView I want my Camera to see BOTH layers and then when the transition is complete switch to have only a single layer in the culling mask. Possible?

 

The layer indices are bitshifted when set to the culling mask. Try combining them with bitwise OR:

Code (CSharp):

1. int layer1 = LayerMask.NameToLayer("MyLayer1");
2. int layer2 = LayerMask.NameToLayer("MyLayer2");
3.  
4. cam.cullingMask = (1 << layer1) | (1 << layer2);

 

Code (CSharp):

1. this.camera.cullingMask = LayerMask.GetMask("Default", "TransparentFX", "Ignore Raycast", "Water", "UI", "Rig");

Or event simplier:

Code (CSharp):

1. [SerializeField]
2. private LayerMask openMask;
3. ...
4. this.camera.cullingMask = openMask;

And Some guys has bit of add and disable variant: https://answers.unity.com/questions/348974/edit-camera-culling-mask.html