faceforward — return a vector pointing in the same direction as another
| ||genType N,|
|genType Nref |
Specifies the vector to orient.
Specifies the incident vector.
Specifies the reference vector.
faceforward orients a vector to point away from a surface as defined by its normal. If dot
I) < 0
N, otherwise it returns
|OpenGL ES Shading Language Version|
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