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Algebraic Smooth Occluding Contours
Computing occluding contours is a key building block of non-photorealistic
rendering, but producing contours with consistent visibility has been
notoriously challenging. This paper describes the first general-purpose smooth
surface construction for which the occluding contours can be computed in closed
form. For a given input mesh and camera viewpoint, we produce a
piecewise-quadratic surface approximating the mesh. We show how the image-space
occluding contours of this representation may then be described as piecewise
rational curves. We show that this method produces smooth contours with
consistent visibility much more efficiently than the state-of-the-art.Comment: 10 pages, 11 figure
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