Cg17_2013

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Unformatted text preview: n n-sided polygon for each n-valence vertex (Valence being the number of edges that touch the vertex). Doo-Sabin Subdivision (3) The new mesh will be composed of – quadrilaterals for each edge in the old mesh, – a smaller n-sided polygon for each n-sided polygon in the old mesh, and – an n-sided polygon for each n-valence vertex (Valence being the number of edges that touch the vertex). Doo-Sabin Subdivision • Proposed by Doo and Sabin in 1978 • An extension of Chaiken’s algorithm to 3D mesh surfaces http://www.rose-hulman.edu/~finn/CCLI/Applets/DooSabinApplet.html Catmull-Clark Subdivision • A face with n edges are subdivided into n quadrilaterals • Quads are better than triangles at capturing the symmetries of natural and man-made objects. Catmull-Clark Subdivision FACE EDGE VERTEX http://www.rose-hulman. edu/~finn/CCLI/Applets/CatmullClarkApplet. html Modeling with Catmull-Clark • Subdivision produces smooth continuous surfaces. • How can “sharpness” and creases be controlled in a mode...
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This document was uploaded on 03/26/2014.

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