An object-oriented methodology using dynamic variables for animation and scientific visualization
CG International '90 Proceedings of the eighth international conference of the Computer Graphics Society on CG International '90: computer graphics around the world
SIGGRAPH '92 Proceedings of the 19th annual conference on Computer graphics and interactive techniques
Direct manipulation of free-form deformations
SIGGRAPH '92 Proceedings of the 19th annual conference on Computer graphics and interactive techniques
Geometric manipulation of tensor product surfaces
I3D '92 Proceedings of the 1992 symposium on Interactive 3D graphics
A Generalization of Algebraic Surface Drawing
ACM Transactions on Graphics (TOG)
Hierarchical B-spline refinement
SIGGRAPH '88 Proceedings of the 15th annual conference on Computer graphics and interactive techniques
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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.