Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Object
MINH_OBJECT
Parameter: Inheritance
MINH_INHERI
Parameter: Variation
MINH_VAR
Parameter: Rotation Inheri.
MINH_ROTINHERI
Parameter: Variation
MINH_ROTVAR
Parameter: Direction Var.
MINH_DIRVAR
Parameter: Type
MINH_DTYPE
Parameter: Radius
MINH_DIST
Parameter: Distance Gradient
MINH_DGRAD
Parameter: Cylinder Axis
MINH_CAXIS
Parameter: Cylinder Height
MINH_CHEIGHT
Parameter: Cylinder Gradient
MINH_CGRAD
Parameter: Scale Gradient
MINH_SGRAD
Parameter: On
IN_MINH_ON
Parameter: Animation Time
IN_MINH_ATIME