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- this takes the .bsp file generated by qbsp and does light casting from all of
- the light objects in the map. Normally, it takes one light sample for each
- lightmap point, but the "-extra" parameter causes it to take four samples (and
- four times as long to run) and average them. The lighting model used has little
- theoretical grounding (it has linear fallof, for instance), it was just tweaked
- until it looked good.
-