I am not sure if this is possible in Corona, but I would like to hide an object from the camera so that it does not render, but is part of the rendering calculations and lighting. The rendering is a 3d view of an apartment unit. I want to hide the roof from the camera so that you can see the interior, but I want it lit like the roof was there.
I have used Maxwell Render, there is an option for this called "hide from camera." It is useful for objects such as invisible light planes, etc...