An explicit spline representation of smooth free-form surfaces is combined with a hierarchy of meshes to form the basis of an interactive sculpting environment. The environment offers localii hierarchical modeling at different levels of detail, direct surface manipulation, change of connectivity for extrusion and to form holes and bridges, and built-in tangent continuity across th& surface where wanted. The free-form surface is represented and can be exported either in NURBS form or as cubic triangular BCzier patches.
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Gonzalez-Ochoa et al. (1999) studied this question.
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