Module darkplaces: Change committed

[havoc at icculus.org]

Commiter   : havoc
CVSROOT    : /cvs/cvsroot/twilight
Module     : darkplaces
Commit time: 2007-03-08 23:50:38 UTC

Log message:

implemented shadow caster culling by creating a frustum plane set that includes the light origin, any object that is not within this frustum (which encloses the screen and a triangular-shaped volume extending to the light origin) can not possibly cast a shadow onto the visible geometry, this reduces cpu work in a few cases (off-screen explosion with several entities further off-screen)

Modified files:
     client.h gl_rmain.c gl_rsurf.c r_shadow.c r_shadow.h render.h
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