ConTesse: Accurate Occluding Contours for Smooth Surfaces

11/11/2021

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by   Chenxi Liu, et al.

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This paper proposes a method for computing the visible occluding contours of smooth surfaces. First, new necessary and sufficient conditions are introduced for when a sampled occluding contour is valid, that is, when it may be assigned consistent visibility. Previous methods do not guarantee these conditions, which helps explain why smooth contour visibility has been such a challenging problem in the past. The paper then proposes an algorithm that, given a smooth subdivision surface, finds sampled contours satisfying these conditions, and then generates a new triangle mesh matching the given occluding contours. The contours of the output triangle mesh may then be rendered with standard non-photorealistic rendering algorithms, using the mesh for visibility computation.