POV-Ray: Transparency using fade_color

[Roland Melkert]

I like the results of this method a lot, the parts do look more realistic and seem to have more depth. It's just that I'm not happy with the results in all circumstances.

What about transparent rubber and stacked transparent parts.

Also I don't understand the fade_distance of 1, if I do that instead of 20 I end up with black white transparent plates in the below scene.