Name
reflect - returns the reflectiton vector given an incidence vector and a normal vector.
Synopsis
float reflect(float i, float n); float2 reflect(float2 i, float2 n); float3 reflect(float3 i, float3 n); float4 reflect(float4 i, float4 n);Parameters
- i
- Incidence vector.
- n
- Normal vector.
Description
Returns the reflectiton vector given an incidence vector i and a normal vector n. The resulting vector is the identical number of components as the two input vectors.
The normal vector n should be normalized. If n is normalized, the output vector will have the same length as the input incidence vector i.
Reference Implementation
reflect for float3 vectors could be implemented this way:
float3 reflect( float3 i, float3 n ) { return i - 2.0 * n * dot(n,i); }Profile Support
reflect is supported in all profiles.
Support in the fp20 is limited.
See Also