摘要
本文对三维立体造型中的一般扫描技术进行了研究,并在PLAN—SMITH的基础上,研制了一个采用一般扫描技术构造三维扫描体素的GSP系统,用以丰富立体造型系统的形体构造器,扩大形体的几何覆盖域和造型功能,该系统的主要功能有:等截面扫描、变截面扫描、平滑过渡扫描及多控制面扫描,可在一给定的三维轴线上对一个、二个或多个二维廓线进行扫描操作。该系统生成的一般扫描体素可参与PLAN—Ⅰ中的布尔运算、真实感显示、物性计算、有限元分析及NC轨迹自动生成等后续处理。另外,本文还对一般扫描技术在多面体棱角倒圆及二次曲面相贯线间的圆角平滑问题上的应用作了一些初步的探讨。
This paper presents a general sweep technique in 3D solid modeling. According to this technique, a general sweep primitive generator system, GSP system, has been built on the basis of PLAN-SMITH, in order to improve the constructor of solid modeling system, and extend the range and ability of modeling. This system allows sweeps with one, two, or several closed 2D contours along a 3D trajectory, thus producing a complex 3D primitive solid. An interface with PLAN-I system is designed, so the sweep primitives can do post-processes like Boolean operation, shading, mass properties calculations, FE analysis, etc. in PLAN-I. In addition, the application of general sweep technique on polyhedron corner rounding, and the intersection line smoothing between two quadric surface, are preliminarily studied in this thesis.
