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Subdivision surfaces in character animation (1998)
| Venue: | In Proceedings of the 25th annual conference on Computer graphics and interactive techniques, SIGGRAPH ’98 |
| Citations: | 233 - 1 self |
BibTeX
@INPROCEEDINGS{Derose98subdivisionsurfaces,
author = {Tony Derose and Michael Kass and Tien Truong},
title = {Subdivision surfaces in character animation},
booktitle = {In Proceedings of the 25th annual conference on Computer graphics and interactive techniques, SIGGRAPH ’98},
year = {1998},
publisher = {ACM}
}
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Abstract
The creation of believable and endearing characters in computer graphics presents a number of technical challenges, including the modeling, animation and rendering of complex shapes such as heads, hands, and clothing. Traditionally, these shapes have been modeled with NURBS surfaces despite the severe topological re-strictions that NURBS impose. In order to move beyond these re-strictions, we have recently introduced subdivision surfaces into our production environment. Subdivision surfaces are not new, but their use in high-end CG production has been limited. Here we describe a series of developments that were required in order for subdivision surfaces to meet the demands of high-end production. First, we devised a practical technique for construct-ing provably smooth variable-radius fillets and blends. Second, we developed methods for using subdivision surfaces in clothing sim-ulation including a new algorithm for efficient collision detection. Third, we developed a method for constructing smooth scalar fields on subdivision surfaces, thereby enabling the use of a wider class of programmable shaders. These developments, which were used extensively in our recently completed short film Geri’s game, have become a highly valued feature of our production environment.
Keyphrases
subdivision surface character animation production environment nurbs surface computer graphic practical technique short film geri game high-end cg production high-end production programmable shaders efficient collision detection smooth variable-radius fillet smooth scalar field new algorithm severe topological re-strictions nurbs impose technical challenge wider class complex shape
