SiReflect function

[littlelion]

Does anybody have the source code for this function. I've got some example code here that uses it, but no function body.

Thx

 

[Humus]

What does SiReflect() do? What does "Si" stand for?

 

[chrisATI]

Perhaps this is what you're looking for? The Si prefix stands for "Sushi Include" (Sushi is the name of ATI's demo engine).

////////////////////////////////////////////////////////////////////////////
// Compute the reflection vector given a view vector and normal.
////////////////////////////////////////////////////////////////////////////
float3 SiReflect (float3 viewVec, float3 normal)
{
   return normalize (2*dot (viewVec, normal)*normal - viewVec);
}

////////////////////////////////////////////////////////////////////////////
// Compute the reflection vector given a view vector, normal, and
// view dot normal
////////////////////////////////////////////////////////////////////////////
float3 SiReflect (float3 viewVec, float3 normal, float nDotV)
{
   return normalize ((2 * nDotV * normal) - viewVec);
}