All that it does is modify texture coordinates in order to warp a texture mapped image.

它所做的事情只是为了使贴图产生扭曲而修改贴图坐标。

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Re-compile the code and ensure that a texture mapped triangle does appear on your screen.

重新编译并运行代码，确保屏幕上出现一个带纹理的三角形。

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However, if you were viewing the actual surface instead of a texture mapped polygon, you would see point B.

但是，当你看着一个实际表面而不是带材质贴图的多边形的时候，你将会看到的是点b。

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