View-Dependent Geometry |
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by Paul Rademacher
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In Proceedings of SIGGRAPH 99
Abstract
When constructing 3D geometry for use in cel animation, the reference
drawings of the object or character often contain various
view-specific distortions, which cannot be captured with conventional
3D models. In this work we present a technique called View-Dependent
Geometry, wherein a 3D model changes shape based on the direction it
is viewed from. A view-dependent model consists of a base model, a set
of key deformations (deformed versions of the base model), and a set
of corresponding key viewpoints (which relate each 2D reference
drawing to the 3D base model). Given an arbitrary viewpoint, our
method interpolates the key deformations to generate a 3D model that
is specific to the new viewpoint, thereby capturing the view-dependent
distortions of the reference drawings.
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