Non-Photorealistic Computer Graphics Library

A Few Good Samples: Shape & Tone Depiction for Hermite RBF Implicits

Author(s): Emilio Vital Brazil, Ives Ma\^cedo, Mario Costa Sousa, Luiz Velho, Luiz Henrique de Figueiredo.
Proceedings: Proceedings of the 8th International Symposium on Non-Photorealistic Animation and Rendering (NPAR'10), pp. 7--15, ACM, 2010.
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Abstract:
We present techniques for rendering Hermite Radial Basis Function (HRBF) Implicits in different pen-and-ink styles. HRBF Implicits is a simple and compact representation, providing three fundamental qualities: a small number of point-normal samples as input for surface reconstruction, good projection of points near the surface, and smoothness of the gradient field. Our approach uses these qualities of HRBF implicits to generate a robust distribution of points to position the drawing primitives. The resulting implicit model is then rendered using point-based primitives to depict shape and tone using silhouettes with hidden-line attenuation, drawing directions, and stippling. We present sample renderings obtained for a variety of models.