PLANE-ELEMENT DISTORTION DETECTION SYSTEM, AND PLANE-ELEMENT DISTORTION DETECTING METHOD AND PROGRAM

摘要

A plane-element distortion detection system for detecting distortion of plane elements created by a computer-aided design system that forms a surface of a 3-D model by combining the plane elements covering at least a part of the 3-D model includes : means for obtaining normal vectors at difference positions on each of selected ones of the plane elements (S213), means for calculating a value indicative of the relationship between adjacent ones of the normal vectors (S214), and plane-element distortion determining means for determining that distortion occurs in the plane element when the value indicative of the relationship between the adjacent normal vectors exceeds a predetermined value (S215,S216). The system reduces occurrence of distortion in shape during a morphing operation on a three-dimensional model comprised of curved patches in which a plurality of normal vectors are defined.