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QRAD (short for Quake RADiosity) was one of the sets of tools originally shipped with the Half-Life mod tools to compile 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 every PVS required a light_environment (can be only seen in decomplied map files from some games) for lighting an outdoor area, which could be tedious for mappers.

See also