Front Face VEX node

Returns the front facing normal of a surface, given a surface normal (N) and an incident ray (I).

See also: Fresnel, Is Front Face, Lighting Model

This operator returns the front facing normal of a surface, given a surface normal (N) and an incident ray (I).

If I or N are not wired, the global variables by the same names will be used instead. Neither vector needs to be normalized. There is an option, however, for the output to be normalized.