Direct manipulation of generalized cylinders based on B-spline motion

摘要

We present a direct manipulation tech- nique that allows interactive control of the shape of generalized cylinders. We in- terpret the generalized cylinder as the sweep surface of a planar cross-sectional B-spline curve under B-spline motion. The generated surface is a NURBS surface That interpolates a given sequence of cross- Sectional curves along a skeleton curve. Di- Rectly manipulating a surface point on the Generalized cylinder modifies the cross- Sectional shape and its motion and deforms The generalized cylinder to interpolate the Exact point location specified by the user. The surface is deformed by a target track- Ing procedure.