dba072ef93
We have a set of corners around some vertex. They have arbitrary connectivity between each other and form a set of linked lists through shared smooth edges. We have to linearly traverse each of these lists to mix the normals. And as a way to iterate over all these lists mixed in some index space we use a mask of already visited corners. So we take the first non-checked corner by mask lookup. And this lookup starts from the beginning every time even if we know there is no way to find any elements before current one. In a synthetic example with 20k fan fill of circle this gives a 8x speed up. Pull Request: https://projects.blender.org/blender/blender/pulls/144649
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