So I'm trying to do something fairly simple. When a player "clicks" a specific object, a keypad should appear as a UI item which he can then interact with. First thing I tried, was create a Canvas, add a panel (color black, alpha set to 50%) and also added a 3D object of a keypad to the canvas. I set the render mode of the canvas to "Screen Space - Camera" and dragged my main camera to the "Render Camera" field of the canvas. This works but has a few disadvantages. The main disadvantage being that the canvas and its child objects receive lighting from the scene. And I always want it to be fully lit. So instead, I created a second camera. I set my canvas' layer to "UI". I set the Culling Mask of the new camera to UI only, and remove UI from the Culling mask of the main camera. So the new camera sees the UI objects only, and my main camera sees everything but the UI object. According to just about every tutorial I've found on the interwebs, this should work. It doesn't. When I run the scene, I only see the UI. I can change the values of the priority field, but I always get to see either camera, never both.