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Quake Radiosity, often just shorted to QRAD, was one of the sets of tools originally shipped with the Half-Life mod tools that compiled radiosity and lightmap data into a map.

This was one of the most bugged tools out of the original sets of tools. ZHLT found that this tool packed the direct lighting data into a map twice resulting in longer compile times. He also found that multiple light_environments were required for lighting an outdoor area which was not normal.