Freeform Surface Modeling
There are two methods for creating freeform surfaces in HP PE/SolidDesigner: blending and lofting. This article describes the basics of lofting. The geometry engine, which implements the lofting functionality, uses a single-data-type implementation for its geometric interface, but takes a multiple-data-type, hybrid approach internally.
by Michael Metzger and Sabine Eismann
Article 6 - oct95a6.pdf
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