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Sergey Sharybin 0e47e0cc9e Cycles: Use dedicated BVH for subsurface ray casting ...

This commit makes it so casting subsurface rays will totally ignore all
the BVH nodes and primitives which do not belong to a current object,
making it much simpler traversal code and reduces number of intersection
tests.

Reviewers: brecht, juicyfruit, dingto, lukasstockner97

Differential Revision: https://developer.blender.org/D1823

2016-03-25 13:42:13 +01:00

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