Some times you want to be able to see through a ceiling, floor, or wall but still have the wall bounce light back into the scene. In this Cinema 4D tutorial I show how to set this up by using the "front/back" attribute of the Material tag.
*UPDATE*
It turns out, that having one side invisible will still allow light to pass through it, SO you need to block the light with a solid. BUT you will still be able to see through the wall and have the "solid" side bounce light.
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Matt
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