Implicit surfaces are becoming increasingly popular for modeling geometric
objects. Procedurally defined implicit surfaces, in particular surfaces
built around skeletons, provide an intuitive representation for many
natural objects, and objects commonly used in geometric modeling. This
paper presents a number of techniques that provide good control over the
shape of the implicit surface and the way different surfaces blend together.
Some extensions to these techniques provide a simple and convenient
representation for "soft" surfaces of revolution, randomly deformed surfaces,
and other interesting shapes that would otherwise be difficult to model.
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