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Is there any working C++ source code for a lightmap generation algorithm using Radiosity or any other GI system? I've found technical papers only, but I can't really find any implementation.

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http://zhlt.info/download-zhlt.html - you might find the source code of "hlrad" (Half-Life RADiosity lightmap compiler) useful.

It's not "true C++" but it shouldn't be hard to make sense of it.

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