On the Degree of Vertices in a Shadow Volume Silhouette
Journal article, 2003

In shadow volume rendering, the shadow volume silhouette edges are used to create primitives that model the shadow volume. A common misconception is that the vertices on such silhouettes can only be connected to two silhouette edges, i.e., have degree two. Furthermore, some believe that such a vertex can have any degree. In this short note, we present a geometric proof that shows that the degree of a silhouette vertex must be even, and not necessarily two.


Tomas Akenine-Möller

Ulf Assarsson

Chalmers, Department of Computer Engineering

Journal of Graphics Tools

1086-7651 (ISSN)

Vol. 8 4 21-24

Subject Categories

Computer Engineering



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