光线追踪显示体数据的新求交算法

本文就利用光线追踪方法完成的体绘制提出一种新的求交算法，此算法与以前的求交算法有本质上的不同，求交过程不再是相对于ＣＥＬＬ进行求交，而是直接相对于ｘ，ｙ，ｚ族平面直接进行求交，故此算法所需的运算量相以地于其它算法是非常小的，而且可以直接控制求交顺序而无需排序，这样得到的求交结果对于反续的运算是极方便的，由分析求交过程可以方便的得到交点所对应的ＣＥＬＬ标号，这又方便了颜色向量，隐匿因子的积累、结合等

A NEW INTERSECTING ALGORITHM FOR VOLUME RENDERING WITH RAY TRACING

This Paper introduces a new intersecting algorithm in ray tracing method to realize volume rendering.This algorithm is different from previous algorithms in essence.The procedure of intersecting is not related to the CELL,but related directly to x,y,z family planes.So the algorithm needs very little amount of calculation,and can directly control the Sequence of intersecing, which is very helpful to successive calculation.From analysis of the intersecting procedure, the CELL number corresponding to the intersected points can be easily gained,which is abc helpful in the successive cumulative operatinn of color vector and opacity factor,and combining. Another advantage of this algorithm is that these resuhs can be gained without adding any new data structures for CELL organization, which is useful for reducing space overhead and searching time cost.