Fix #30034: bug in multiple importance sampling + transparency, would give slightly wrong lighting behind transparent objects.
Fix #30034: bug in multiple importance sampling + transparency, would
give slightly wrong lighting behind transparent objects.


tangent-opensource/coreBlackbird,pyrochlore/cycles,pyrochlore/cycles,pyrochlore/cycles,tangent-opensource/coreBlackbird,tangent-opensource/coreBlackbird