faceforward
Description
Flip vector to face forward, if needed.
Signature
vector<T, N> faceforward<T, N:int>( vector<T, N> n, vector<T, N> i, vector<T, N> ng) where T : __BuiltinFloatingPointType;
Generic Parameters
T: __BuiltinFloatingPointType
N : int
Parameters
n : vector<T, N>
The vector to orient.
i : vector<T, N>
The incident vector.
ng : vector<T, N>
The geometric normal vector.
Return value
n if the dot product of ng and i is less than 0, otherwise -n.
Availability and Requirements
Defined for the following targets:
hlsl
Available in all stages.
glsl
Available in all stages.
cpp
Available in all stages.
cuda
Available in all stages.
metal
Available in all stages.
wgsl
Available in all stages.
spirv
Available in all stages.