Article,

Curvature and Creases: A Primer on Paper

.
Computers, IEEE Transactions on, C-25 (10): 1010-1019 (October 1976)
DOI: 10.1109/TC.1976.1674542

Abstract

This paper presents fundamental results about how zero-curvature (paper) surfaces behave near creases and apices of cones. These entities are natural generalizations of the edges and vertices of piecewise-planar surfaces. Consequently, paper surfaces may furnish a richer and yet still tractable class of surfaces for computer-aided design and computer graphics applications than do polyhedral surfaces.

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