一种改进的基于GPU编程的光线投射算法

摘要

针对传统光线投射算法采样效率低、绘制精度差等缺点,提出一种新的体绘制算法,所给算法采用新的采样合成函数,并结合经典的Blinn-Phong光照模型,采用不透明度提前截止判断光线终止.整个过程使用Cg语言编写顶点程序和片段程序来实现.实验结果表明算法既可以增强传统光线投射算法的绘制效果,也可以加快算法的速度.%For the low sampling efficiency and poor sampling efficiency in the traditional ray casting algorithm, a volume rendering algorithm with a new sample synthesis function is proposed. This algorithm applies Blinn-Phong illumination model and uses early opacity termination. It' s implemented by vertex programs and fragment programs in Cg language. The results of experiment show that this algorithm can not only enhance the effect of traditional ray-casting algorithm, but also accelerate the speed of the algorithm.