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An Improved Illumination Model for Shaded Display This is Turner Whitted's original Ray Tracing paper
，推荐阅读搜狗输入法获取更多信息
The disadvantage is that the syntax seems a lot，更多细节参见同城约会
Percentile 90: 124.824 ms | 196.064 ms。下载安装汽水音乐对此有专业解读