摘要： 光线投射是一个重要的体绘制算法,但直线上采样点的确定是非常费时的,也是影响体绘制实时性的重要因素。该文利用直线和平面族的交点可以快速求得直线上的采样点及其特征值,该方法充分利用了直线的相关性,避免了大量的三线性插值计算。该文还基于快速求交提出了自适应采用方法,以提高绘制图像的质量。

关键词: 直接体绘制, 光线投射, 求交, 自适应, 体数据

Abstract: Ray casting is an important algorithm in direct volume rendering, but the computation of sampling-points on ray is time-consuming, and the large amount of computation is a primary drawback for real time rendering. This paper presents a fast intersecting technique of a line with some family planes, so using the intersected points can easily gain the sampling-points and their characters. This method can eliminate lots of computation for trilinear interpolation by using coherency of lines. In order to improve image quality, the paper also presents an adaptive sampling method based on rapid intersecting.

中图分类号: 

• TP391.41