Alaska
01ca5dfc7b
When using light linking with the light tree, the root index of a mesh light subtree can be 0. The current code assumed this wasn't possible, and as such it caused rendering issues, specifically the incorrect computation of the PDF of certain mesh lights during forward path tracing. So we adjust the code to allow mesh light subtree root node indices of 0. This was worked on by Alaska, Sergey, and Weizhen Pull Request: https://projects.blender.org/blender/blender/pulls/119770
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