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I have a plane. On that plane is a cube. That cube has a brown texture, but the object itself is set to the "Color [1 0 0]"(red). I have a strong light shining on the side of the box but it's not touching the plane. How do I get the brown texture to bleed onto the plane underneath? I'm already trying right now, but I'm just getting red color bleeding.
Hmm, I need to know a little more on how you're rendering.
Typically, for global illumination you need 3 passes:
Pass1: Use the photon shader to construct a photon map
Pass2 (optional): Use irradiance caching to perform final gather and save the result to a pointcloud (using the indirectdiffuse function).
Pass3: Use the point cloud you generated in the previous step to beauty rendering (using the indirectdiffuse function again).
There are only several built-in materials for photon mapping, so choose them carefully.