在这部分里，详细地讨论了实现光影效果的不同算法的效率，并且找到一种高效地计算栅格顶点法向量的途径；
In this part, the different algorithms for light-effect are discussed in details and a best way for the calculation of a large amount of vertexes normal is presented.
GIMP是一个流行的栅格图像编辑应用程序，适用于几乎所有现代图形计算平台，提供许多与adobe Photoshop相同的功能。
GIMP is a popular raster image editing application that is available for almost all modern graphical computing platforms and provides many of the same capabilities as Adobe Photoshop.
通过分析栅格数据对信号的传播进行计算。
By analyzing the raster data to do the calculation of the spread of the signal.
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