I have noticed that when using the mask brush 3D with the camera that when I rotate the camera around 360 the objects dont actually pass over one another. They always remain facing the camera and they always remain in the same position in 3D space ie. the rear ones stay at the rear and the front ones stay at the front. Its kind of an illusion of 3D but not really 3D. If it was really 3d then they would pass over one another in space but they never do so the illusion is ruined. Please correct if Im wrong here. Am I missing something or perhaps its a setting?