CAID中由透视草图重建三维模型的算法研究

Research of cre ating 3D model from 2D perspective sketches in CAID

研究了计算机辅助工业设计中由透视图重建三维模型的算法。研究的目的是实现透视图的数字化 ,即由计算机自动或半自动地识别工业设计师绘制后扫描输入计算机的或利用数字化输入设备输入计算机的产品透视图 ,得出产品的三维数字模型。从而为工业设计师提供更方便的设计辅助手段。以射影几何、透视理论的基本原理为基础 ,探讨了根据平面立体 ,二次曲面及自由曲线的透视草图重建三维几何模型的若干问题。给出了用计算机进行平面立体 ,二次曲面及自由曲线的透视图数字化算法 ,为开发实现由透视图重建产品模型的软件提供了理论基础。

Algorithm of reconstructing 3D models from perspective sketches and renderings in computer aided industrial design is introduced. The aim of this paper is to enable digitalization of perspective sketches. Perspective sketches of a product, which have been drawn by stylists or input into computers by digital devices, are automatically or semi\|automatically recognized and imported into computers. Sketch reconstruction of different models including planar models, conical surfaces and freeform curves are discussed based on the perspective theory. Algorithms for digitalization of perspective sketches of planar models, conical surfaces and freeform curves are presented. These studies supply a theoretical foundation and make it possible to develop software to realize the reconstruction of models of products from perspective sketches. The software could provide convenient approaches for stylists and could aid stylists to make good innovative designs.