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参考网址:
https://blog.csdn.net/tinyhum3d/article/details/44040447
https://blog.csdn.net/candycat1992/article/details/17485631
https://blog.csdn.net/huutu/article/details/50934670
https://answers.unity.com/questions/584546/cel-shading-using-a-rampreference-texture.html
https://gamedev.stackexchange.com/questions/51063/what-is-ramp-shading-or-lighting