Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Target Spline
FP_FOLLOWSPLINE_OBJECT_LINK
Parameter: Invert Spline Direction
FP_FOLLOWSPLINE_OBJECT_INVERTDIR
Parameter: Mode
FP_FOLLOWSPLINE_OBJECT_BEHAVIOUR
Parameter: Rail
FP_FOLLOWSPLINE_OBJECT_LINK_RAIL
Parameter: Invert Rail Direction
FP_FOLLOWSPLINE_OBJECT_INVERTDIR_RAIL
Parameter: Use Closest Point on Rail
FP_FOLLOWSPLINE_OBJECT_RAIL_CLOSEST
Parameter: Mix
FP_FOLLOWSPLINE_OBJECT_MIX_FACTOR
Parameter: Effect Radius
FP_FOLLOWSPLINE_OBJECT_RADIUS
Parameter: Source
FP_FOLLOWSPLINE_OBJECT_MAP_QUANTITY
Parameter: Source Scale
FP_FOLLOWSPLINE_OBJECT_MAP_QUANTITY_SCALE
Parameter: Segment
FP_FOLLOWSPLINE_OBJECT_MULTI_SEGMENT_MODE
Parameter: Segment Index
FP_FOLLOWSPLINE_OBJECT_MULTI_SEGMENT_CHOICE
Parameter: Attract Strength
FP_FOLLOWSPLINE_OBJECT_ATTRACT_STRENGTH
Parameter: Attract Falloff
FP_FOLLOWSPLINE_OBJECT_FALLOFF_ATTRACT_RADIUS
Parameter: Attract Map
FP_FOLLOWSPLINE_OBJECT_ATTRACT_STRENGTH_MAP
Parameter: Follow Strength
FP_FOLLOWSPLINE_OBJECT_FOLLOW_STRENGTH
Parameter: Follow Falloff
FP_FOLLOWSPLINE_OBJECT_FALLOFF_FOLLOW_RADIUS
Parameter: Follow Map
FP_FOLLOWSPLINE_OBJECT_FOLLOW_STRENGTH_MAP
Parameter: Align Mix
FP_FOLLOWSPLINE_OBJECT_ALIGN_MIX
Parameter: Exit Behaviour
FP_FOLLOWSPLINE_OBJECT_EXITBEHAVIOUR_CLOSEST
Parameter: Exit Behaviour
FP_FOLLOWSPLINE_OBJECT_EXITBEHAVIOUR
Parameter: Target Group
FP_FOLLOWSPLINE_OBJECT_TARGET_GROUP
Parameter: Create Group
FP_FOLLOWSPLINE_OBJECT_CREATEGROUP