FACEFORWARD(3G) [FIXME: manual] FACEFORWARD(3G)

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) < 0 faceforward 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) - - - - - -

reflect(), refract()

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 © 2011-2014 Khronos Group
05/17/2020 [FIXME: source]