Feature surface recognition in reverse engineering

An algorithm of feature surface recognition based on quadric surface fitting and geometry property was presented.Firstly,using quadric surface to fit with given surface and calculate the error metric to identify free surface and general quadric surface.Then,compute geometry property of each point on Gaussian sphere and curvature coordinate.The distribution would identify each kind of quadric surface and blend surface.In order to improve the efficiency and practicability,this algorithm calculated approximation distance from point to surface and make priority to identify planes.This algorithm is easy to recognize plane,cylinder,cone,sphere,blend surface and free surface.