4a328b5a63
Several small speedups for Voronoi node (no behavior change). This affects Cycles and CPU execution of Voronoi node e.g. in Compositor. - F1 mode: when evaluating distance for Voronoi cells, use a faster distance estimation, and only do final distance calculation on the resulting closest cell. This is only really relevant for the default Euclidian distance, where this saves a square root per evaluated cell (in 3D Voronoi case saves 26 square roots; in 4D case saves 80 square roots). - N-Sphere Radius mode: speedup by doing squared distance calculations. We only need to find the closest one, so again doing the square root per cell is not needed here. Something like 5%-10% speedup for F1 3D Voronoi; more performance details in the PR. Pull Request: https://projects.blender.org/blender/blender/pulls/139490
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