Feature Parameters Extraction of Blending Surfaces for CAD Geometry Models Compression

In this paper, a CAD model compression approach is presented by representing blending surfaces with their spine curves and variation functions of blending radiuses. The core idea of this approach is to recognize blending surfaces from all B-spline surfaces in a CAD geometry model by analyzing their principle curvature curves, and then extracting their feature parameters i.e. spine curves and variation functions of blending radiuses. Experiments demonstrate that the geometry models including blending surfaces are greatly compressed, which benefits much to cooperative development of complex products, mass customization, and 3D geometry search over internet.