faceforward — return a vector pointing in the same direction as another
genType faceforward( | genType N, |
| genType I, | |
genType Nref); |
genDType faceforward( | genDType N, |
| genDType I, | |
genDType Nref); |
N Specifies the vector to orient.
I Specifies the incident vector.
Nref Specifies the reference vector.
faceforward orients a vector to point away from a surface as defined by its normal. If dot( Nref, I) < 0faceforward returns N, otherwise it returns -. N
| OpenGL Shading Language Version | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Function Name | 1.10 | 1.20 | 1.30 | 1.40 | 1.50 | 3.30 | 4.00 | 4.10 | 4.20 | 4.30 | 4.40 | 4.50 |
| faceforward (genType) | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
| faceforward (genDType) | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
Copyright © 2011-2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. https://opencontent.org/openpub/.