Ray tracing, used during generating realistic images, is systematically introduced in this article. And some improving methods are given for shadow test and antialiasing.

本文对逼真图形生成过程中所使用的光线跟踪法作了系统的介绍，并对其中的阴影测试及抗阶梯效应的几种改进方法作了说明。

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This paper proposes a blind sidewalk detecting and tracing algorithm based on the color information and lays emphasis on dealing with the change of illumination and the cast shadow.

本文提出了一种基于颜色信息的盲道区域识别与跟随算法，侧重于解决光照条件改变与有投射阴影的条件下导盲道的识别问题。

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The 3d wavefront construction method ray tracing can ensure stabile and reasonable density of rays, avoid the shadow problems in those traditional methods for ray tracing.

三维波前重建法射线追踪过程中可以保证稳定合理的射线密度，克服了常规射线追踪方法存在阴影区的问题。

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