Okay, I think I'm getting somewhere now.
Really didn't realize how hard the lighting was going to be on this shot!
In the end, I gave up on "realistic" light coming in the window, and just put the spotlight INSIDE the porthole. Less physically accurate, but it works better -- no weird shadow-layer stuff.
Also, realized that since I added "Emit" to all the toon materials to give them a basic dark color, I need to tone that down in the composite a bit to get the light contrast I was after.
#Blender3D #BlenderInternal #Lighting #NPR3D