HRESULT GetVelocity(LPDIRECT3DRMFRAME lpRef, LPD3DVECTOR lprvVel,
BOOL fRotVel);
Retrieves the velocity of the frame relative to the given reference frame.
·Returns D3DRM_OK if successful, or an error otherwise. For a list of possible return codes, see Direct3D Retained-Mode Return Values.
lpRef
Address of a variable that represents the Direct3DRMFrame object to be used as the reference.
lprvVel
Address of a D3DVECTOR structure that will be filled with the frame's velocity.
fRotVel
Flag specifying whether the rotational velocity of the object is taken into account when retrieving the linear velocity. If this parameter is TRUE, the object's rotational velocity is included in the calculation.