FACEFORWARD(3G)                 [FIXME: manual]                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    | 1.10 | 1.20 | 1.30 | 1.40 | 1.50 | 3.30 | 4.00 | 4.10 | 4.20 | 4.30 | 4.40 | 4.50 |
       |Name        |      |      |      |      |      |      |      |      |      |      |      |      |
       +------------+------+------+------+------+------+------+------+------+------+------+------+------+
       |faceforward | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  |
       |(genType)   |      |      |      |      |      |      |      |      |      |      |      |      |
       +------------+------+------+------+------+------+------+------+------+------+------+------+------+
       |faceforward |  -   |  -   |  -   |  -   |  -   |  -   | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  |
       |(genDType)  |      |      |      |      |      |      |      |      |      |      |      |      |
       +------------+------+------+------+------+------+------+------+------+------+------+------+------+

SEE ALSO
       reflect(), refract()

COPYRIGHT
       Copyright (C) 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 (C) 2011-2014 Khronos Group

[FIXME: source]                   05/21/2022                   FACEFORWARD(3G)