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Issue No.05 - September-October (1997 vol.17)
pp: 40-46
Sculptors and animators have requirements different from those of engineers. Existing freeform modeling methods do not address those requirements. We propose a new kind of parametric surface model based on the notion of features. In ordinary language, a feature is a logically distinct area of a surface or some characteristic of part of a surface. For the purpose of the modeler, we define a feature as a combination of a blending function and a shape generator. This leads to a natural extension of the idea of a parametric surface controlled by position vectors. Features can be introduced anywhere on the surface, added and combined to create complex shapes. We have built an experimental surface editor using these principles. Examples of shape creation and manipulation are presented.
Geoff Wyvill, Dean McRobie, Michael Gigante, "Modeling with Features", IEEE Computer Graphics and Applications, vol.17, no. 5, pp. 40-46, September-October 1997, doi:10.1109/38.610204
1. D.R. Forsey and R.H. Bartels, “Hierarchical B-Spline Refinement,” Computer Graphics (SIGGRAPH '88 Proc.), vol. 22, no. 4, pp. 205-212, Aug. 1988.
2. W. Welch and A. Witkin, “Variational Surface Modeling,” Proc. ACM SIGGRAPH, pp. 157-166, July 1992.
3. B. Fowler, "Geometric Manipulation of Tensor Product Surfaces," in Symp. on Interactive Graphics, Computer Graphics (Proc. Siggraph 92), Vol. 26, No. 2, July 1992, pp. 101-108.
4. W.M. Hsu,J.F. Hughes, and H. Kaufman,"Direct Manipulation of Free-Form Deformations," Computer Graphics, vol. 26, no. 2, pp. 177-184, 1992 (Siggraph 92).
5. J.F. Blinn,“A generalization of algebraic surface drawing,” ACM Trans. on Graphics, vol.1, no.3, pp. 235-256, 1982.
6. H. Nishimura et al., "Object Modeling by Distribution Function and a Method of Image Generation," Proc. Electronics Communication Conf., Vol. J68-D, 1985, p. 4 (in Japanese).
7. G. Wyvill, C. McPheeters, and B. Wyvill, "Data Structure for Soft Objects," The Visual Computer, Vol. 2, No. 4, Aug. 1986, pp. 227-234.
8. G. Wyvill, C. En, and A. Trotman, "The Cao En Surface: A New Approach to Freeform Geometric Models," Programmirovanie, Vol. 4, 1992 (in Russian); English version in Programming and Computer Software, Vol. 18, No. 4, 1992, pp. 135-145.
9. G. Wyvill and D. McRobie, "Local and Global Control of Cao En Surfaces," Communicating with Virtual Worlds (Proc. Computer Graphics Int'l), N. Magnenat and D. Thalmann, eds., Springer-Verlag, Berlin, 1993, pp. 216-227.
10. R. Turner et al., "An Object-Oriented Methodology Using Dynamic Variables for Animation and Scientific Visualization," Proc. Computer Graphics Int'l, T.S. Chua and T.L. Kunii, eds., Springer-Verlag, Berlin, 1990, pp. 317-328.
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