FACEFORWARD(3G)

    .SH "NAME" faceforward - return a vector pointing in the same direction as another
    .SH "DECLARATION"

            .HP u genType faceforward(genType N, genType I, genType Nref);
            .HP u genDType faceforward(genDType N, genDType I, genDType Nref);

    .SH "PARAMETERS"

        .PP N

                    Specifies the vector to orient.

            .RE
            .PP I

                        Specifies the incident vector.

                .RE
                .PP Nref

                            Specifies the reference vector.

                    .RE

                .SH "DESCRIPTION"
                    .PP 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.

                .SH "VERSION SUPPORT"
                    .TS allbox tab(:); lB cB s s s s s s s s s s s lB cB cB cB cB cB cB cB cB cB cB cB cB. T{ T}:T{ OpenGL Shading Language Version T} T{ Function Name T}:T{ 1.10 T}:T{ 1.20 T}:T{ 1.30 T}:T{ 1.40 T}:T{ 1.50 T}:T{ 3.30 T}:T{ 4.00 T}:T{ 4.10 T}:T{ 4.20 T}:T{ 4.30 T}:T{ 4.40 T}:T{ 4.50 T} l c c c c c c c c c c c c l c c c c c c c c c c c c. T{ faceforward (genType) T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T} T{ faceforward (genDType) T}:T{ - T}:T{ - T}:T{ - T}:T{ - T}:T{ - T}:T{ - T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}:T{ ✔ T}

                .SH "SEE ALSO"
                    .PP reflect(), refract()

                .SH "COPYRIGHT"
                    .PP 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/.

COPYRIGHT
Copyright © 2011-2014 Khronos Group