Conic Curve
Parameters are accessed with C4DAtom::GetParameter() / C4DAtom::SetParameter() 。见 Parameter IDs .
Parameter: Conic Type
CONICCURVE_TYPE
Parameter: Coefficients A,B,C
CONICCURVE_ABC
Parameter: Coefficients D,E,F
CONICCURVE_DEF
Parameter: Start Point
CONICCURVE_P1
Parameter: End Point
CONICCURVE_P2