The D3D_OVERLOADS constructors for the D3DVERTEX structure offer a convenient way for C++ programmers to create lit vertices.
_D3DVERTEX() { }
_D3DVERTEX(const D3DVECTOR& v, const D3DVECTOR& n, float _tu, float _tv)
{ x = v.x; y = v.y; z = v.z;
nx = n.x; ny = n.y; nz = n.z;
tu = _tu; tv = _tv;
}