613055016d
Speeds up building the sculpt BVH tree by over 3x. The total bounds for all the triangles/grids in the current node is recalculated for every iteration of the node splitting algorithm that builds the BVH tree. The first step was parallelized, but since the number of elements is just divided in half every time, many of the subsequent bounds calculations are significantly large to benefit from parallelism too (actually all of them for mesh BVH currently, since the leaf size is about 4000).
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