2a5c1fc9ccbabfaef4eeaf90093dfb2ac0acfc90
The idea is to delay shooting indirect rays for the SSS sampling and trace them after the main integration loop was finished. This reduces GPU stack usage even further and brings it down to around 652MB (comparing to 722MB before the change and 946MB with previous stable release). This also solves the speed regression happened in the previous commit and now simple SSS scene (SSS suzanne on the floor) renders in 0:50 (comparing to 1:16 with previous commit and 1:03 with official release).
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