FACEFORWARD(3G)

NAME
faceforward - return a vector pointing in the same direction as another

DECLARATION

genType faceforward(genType N, genType I, genType Nref);

genDType faceforward(genDType N, genDType I, genDType Nref);

PARAMETERS

N
    Specifies the vector to orient.

I
    Specifies the incident vector.

Nref
    Specifies the reference vector.

DESCRIPTION

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.

VERSION SUPPORT
 | 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) | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔

SEE ALSO

reflect(), refract()

COPYRIGHT

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. http://opencontent.org/openpub/.

COPYRIGHT
Copyright © 2011-2014 Khronos Group