This helper function returns the absolute value of the specified vector. Magnitude is part of the suite of extra functionality that is available to C++ programmers who define D3D_OVERLOADS.
D3DVALUE Magnitude (const _D3DVECTOR& v);
This function is defined as follows:
inline D3DVALUE
Magnitude (const _D3DVECTOR& v)
{
return (D3DVALUE) sqrt(SquareMagnitude(v));
}