I am trying to create a specific effect, and I'm not even sure if its possible. What I would like to do is trace the edges of a "hole" in a mesh (or more specifically, the edges of meshes arranged in a sphere)
As you see here (in this horrible illustration) the sphere is made of sub objects. You can remove these sub objects to reveal a new layer underneath. I would like to outline the hole to create a distinction between the layers. Can I create a post effect to handle this?