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I implemented Catmull-Clark and 4-8 (a.k.a. square root of
2) subdivision schemes. Programming these are not fun at all.
If you use a primative data structure, it's slow. If you use
more complex data structure (ie. split edge), well, it's pointer
nightmare. But once it's working, it's COOL. So, here are some
images from my subdivision program.
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