[Bf-cycles] Volumetric patch update (now with new shiny bidirectional integrator)

storm kartochka22 at yandex.ru
Tue Apr 2 04:16:24 CEST 2013

Rebased after SSS addition, quick tested on 3 scenes, almost work as
before, but SSS change a lot, maybe rebasing have some bugs. No other
changes, few commented out lines as attempt to better handle asymmetric
BSDF (smooth normals). "Volume BSDF" node ID bumped again, old saved
scenes with that material will have glitches.

Congratilations all who wait real SSS. That random triangle sample is
interesting, maybe i can reuse it for other patch needs. Maybe i will
try to replace that sample by my core volume sample, just for fun, but
not now, have many other things to do.

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