typedef struct _D3DRMQUATERNION {
D3DVALUE s;
D3DVECTOR v;
}D3DRMQUATERNION;
typedef D3DRMQUATERNION, *LPD3DRMQUATERNION;
Describes the rotation used by the IDirect3DRMAnimation::AddRotateKey method. It is also used in several of Direct3D's mathematical functions.