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ACM Transactions on Graphics (TOG), Volume 23 Issue 1, January 2004

Adaptive medial-axis approximation for sphere-tree construction
Gareth Bradshaw, Carol O'Sullivan
Pages: 1-26
DOI: 10.1145/966131.966132
Hierarchical object representations play an important role in performing efficient collision handling. Many different geometric primitives have been used to construct these representations, which allow areas of interaction to be localized quickly....

Human facial illustrations: Creation and psychophysical evaluation
Bruce Gooch, Erik Reinhard, Amy Gooch
Pages: 27-44
DOI: 10.1145/966131.966133
We present a method for creating black-and-white illustrations from photographs of human faces. In addition an interactive technique is demonstrated for deforming these black-and-white facial illustrations to create caricatures which highlight and...

A novel cubic-order algorithm for approximating principal direction vectors
Jack Goldfeather, Victoria Interrante
Pages: 45-63
DOI: 10.1145/966131.966134
There are a number of applications in computer graphics that require as a first step the accurate estimation of principal direction vectors at arbitrary vertices on a triangulated surface. Although several methods for calculating principal directions...

Perceptually based brush strokes for nonphotorealistic visualization
Christopher G. Healey, Laura Tateosian, James T. Enns, Mark Remple
Pages: 64-96
DOI: 10.1145/966131.966135
An important problem in the area of computer graphics is the visualization of large, complex information spaces. Datasets of this type have grown rapidly in recent years, both in number and in size. Images of the data stored in these collections must...