3-sided patches

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Old 12 December 2003   #1
Question 3-sided patches

Does anyone know the formulas/algorithm/math to make these work? I understand 4-sided patches, but the damned book doesn't say anything about 3-sided patches....

Help :(
Old 12 December 2003   #2
Oh to be more specific I'm looking into Bezier patches.
Old 12 December 2003   #3
Check out ATI's developers section for information on N-Patches. Essentially what they do is to convert each triangle in a mesh into a bezier triangle, and then tesselate that. IIRC there are a couple of pdfs on their site that outline how to (a) get bezier control points from just a triangle's vertices+normals, and (b) how to render bezier triangles.

Look for the paper "Curved PN Triangles" on this page (links to www.ati.com)

Old 12 December 2003   #4
There's an N-patches article on gamasutra. You'll need to register at gamasutra if you havn't already.
Old 12 December 2003   #5
Thanks a lot!
These'll take some digesting
Old 01 January 2006   #6
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