I've got a project running on school in a group 3 and were trying to combine flash with 3d. So we've decided cellshade rendering. This is the first time i work with this kind of rendering and i've encountered a very annoying problem.

For example, when i place a rock in a envoirement and i let it hit the ground it shows double lined objects. The rock has its own lining and the floor aswell. Now i dont wanne remove both the lines but i want to avoid the double lines.

O and if your wondering what i'm creating. Its advertisement for kids to make diving look attractive for them .
These are jpegs of what i'm talking about.





If anyone knows how to refine the lines and how to avoid the ugly double lined objects when they hit eachother i would be very happy!