| DirectX SDK | 
Members of the CONST_DIEFFFLAGS enumeration are used in the lFlags member of the DIEFFECT type.
Enum CONST_DIEFFFLAGS
    DIEFF_CARTESIAN =    16 (&H10)
    DIEFF_OBJECTOFFSETS = 2
    DIEFF_POLAR =        32 (&H20)
End Enum
The default behavior of DirectInputDevice.CreateEffect and DirectInputDevice.CreateCustomEffect is to create the effect as if DIEFFECT.lFlags contained (DIEFF_OBJECTOFFSETS Or DIEFF_POLAR). In other words, it is not necessary to specify these flags.