Name

faceforward — return a vector pointing in the same direction as another

Declaration

genType faceforward(genType N,
 genType I,
 genType 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 ES Shading Language Version
Function Name 1.00 3.00
faceforward (genType)✔✔

See Also

reflect, refract

Copyright

Copyright © 2011-2013 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.