边界表示法 meaning in English
boundary representation (b-rep)
Examples
- Under opengl environment , we use four - side grids to reconstruct a worm surface and gain a solid modeling of worm . under the computer virtual reality environment , we simulate the manufacturing process of dual generating method
在此基础上，在opengl编程环境下，以四边形网格构造蜗杆理论型面，以边界表示法中的半边数据结构表达蜗杆实体，获得蜗杆的三维实体模型及其型面数据。 - An accelerated direct rendering algorith of isosurface for 3d data sets is presented . the problem for calculating the intersections of the ray and the bounding cells pierced by the isosurface can be viewed as the problem of sampling alonga 3d discreteray . it is shown that the algorithm is better on memory requirement and speed than traditional algorithm through its realization on pc
提出等值面直接显示算法，充分利用数据空间的相关性，把体素分为边界体素和内部体素，并采用体数据边界表示法，降低了内存.绘制等值面时，将视线与边界体素的求交运算转化为对离散视线上点的扫描，避开对整个体数据空间的遍历，从而减少了计算量。 - This provide a basis for further application such as feature editing and so on . unlike traditional method which modifies b - rep or csg to adapt feature - based modeling , the feature - based represent model for the product which based on identifying system is presented . the represent method need not change the b - rep of solid model and can map feature - based model to b - rep - based model
不同于通常的对边界表示法或csg法进行改造的模型表示方法，提出了一种基于标识子系统的特征表示模型，一个零件的特征表示模型和其低层的几何实体模型通过标识子系统进行映射，从而不必修改现有的边界表示模型而能满足特征造型的需要并能充分利用已有的实体造型功能。