The GetDistanceFactor method retrieves the distance factor, which is the number of meters in a vector unit.
HRESULT GetDistanceFactor( D3DVALUE * pflDistanceFactor );
If the method succeeds, the return value is DS_OK. If the method fails, the return value may be DSERR_INVALIDPARAM.
Header: Declared in Dsound.h.
Import Library: Use Dsound3d.dll.