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Matt Ebb d6808c2b4b * Raytraced shadow casting for volumes ...

This is a first version and still has a couple of things undefined or
unimplemented, such as external objects casting shadows on or within volumes, 
however volume->solid shadows are going ok.

http://mke3.net/blender/devel/rendering/volumetrics/shadows_test_02.mov
http://mke3.net/blender/devel/rendering/volumetrics/vol_test_shad3.blend

As with other transparent raytraced shadows in Blender ,in order to make it work,
you must enable 'TraShad' on the material *receiving* the shadow. It would be 
nice to make this a bit easier to use, since there's not much chance you want a
volume material to be casting solid shadows, but that's a bigger issue in the 
renderer outside this scope.

The volume shadows are working from the same physical basis of absorption, and 
support coloured absorption:

http://mke3.net/blender/devel/rendering/volumetrics/vol_shad_absorption.png

They also work properly with multi-sampled (i.e. QMC) soft shadows:

http://mke3.net/blender/devel/rendering/volumetrics/vol_shad_sharp.png
http://mke3.net/blender/devel/rendering/volumetrics/vol_shad_soft.png

And by popular request the test file:
http://mke3.net/blender/devel/rendering/volumetrics/vol_test_shad_clouds.blend

2008-10-13 05:22:31 +00:00

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