For a bit of fun, I spent some time trying to work out how SubDs work in Modo, and reproduced that in Unity by writing some Perl in Modo, and a custom DAE importer in C#.

The two most useful information sources were:

Subdivision Surfaces in Character Animation (siggraph 1998):
graphics.pixar.com/library/Geri/

Rory Driscoll's blog:
rorydriscoll.com/2008/08/01/catmull-clark-subdivision-the-basics/

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