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Copyright 2013 Pixar
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adding an arbitrary break if vertex valence is > 256
- add a Warning function to Osd error reporting
- minor cleanup /refactor / document of OsdError
fixes#167
- [Feature Adaptive GPU Rendering of Catmull-Clark Surfaces](http://research.microsoft.com/en-us/um/people/cloop/tog2012.pdf).
- New API architecture : we are planning to lock on to this new framework as the basis for backward compatibility, which we will enforce from Release 1.0 onward. Subsequent releases of OpenSubdiv should not break client code.
- DirectX 11 support
- and much more...
