有限元模型中等值面的快速体绘制算法

本文提出了一种基于光线投射技术显示有限元模型中的等值面的体绘制新算法，通过预处理中生成的特殊结构，可在等值面生成时快速排除模型中不包含等值面的单元。在应用体绘制时采用了图象平面分割技术及光线路径的特殊颜色合成方法，加速了有限元模型中的等值面的绘制。实例表明算法结果正确有效。

Approach of volume rendering for isosurface in FEM

Ray casting, as a major approach of volume rendering, is a technique for visualizing 3D data field, where intersecting and color composition are key problems that affect the efficiency of rendering, especially when the element of data field is unstructured such as FEM. This paper gives a new algorithm using ray casting method for fast and accurate rendering of isosurfaces in FEM. By the special data structure generated in the pre processing step, we can eliminate the irrelevent elements. At the same time, techniques such as image plane dividing and special way of color composition are used. These methods speed up the rendering greatly. The implementation of the algorithm, together with a example are given in this paper.