faceforward

Name. faceforward - returns a normal as-is if a vertex's eye-space position vector points in the opposite direction of a geometric normal, otherwise return ...

faceforward orients a vector to point away from a surface as defined by its normal. If dot ( Nref , I ) < 0 faceforward returns N , otherwise it returns - N .

faceforward orients a vector to point away from a surface as defined by its normal. If dot ( Nref , I ) < 0 faceforward returns N , otherwise it returns - N .

2023年6月12日 — 本文内容. 根据需要翻转表面法线() 朝与i 相反的方向;返回n 中的结果。 ... 此函数使用以下公式：-n 符号(点(i， ng) ) 。

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faceforward() 函数用于判断向量朝向，它可以通过比较入射向量与几何法线的方向，是否一致确定向量朝向。

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