Is it possible to make something (perhaps a plane) block the sun? as in, say the render is looking up at the atmo/clouds and I want half of it to not receive sunlight and the other half do, with the sunlight being about elevation 3. any way to create something ( perhaps a plane) that is in the middle of the atmo and cast shadows on half the atmo/clouds and yet remain invisible to the render camera? or am I thinking of going about this the wrong way?