Sergey Sharybin 8e35a968c5 Subdiv: Use defined order of corner/edge vertices
This switches evaluation of vertices which are on the boundaries
of PTex faces to a single threaded one. While this introduces
some slowdown it fixes ambiguity of PTex index used to evaluate
particular vertex.

Possible alternative solutions would be:
- Do some pre-calculation of index, then do evaluation in threads.
- Try using Gregory patches and see if that makes any affect.

Fix T60235: Flickering of object instances
2019-01-07 17:14:19 +01:00
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