e0f2f07d1e
When having multiple materials in a mesh the triangles are sorted based on material index. This sorting is done single threaded, but needs two loops over the data. One to count the bucket size and the second one to add the triangles to the right position in the buckets. This patch will do the counting in a multithreaded approach that would speed up the cache creation. It has been measured that this part is the most blocking part of the cache creation. Reviewed By: mano-wii Differential Revision: https://developer.blender.org/D11615