Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Mode
MGMOSPLINEOBJECT_MODEParameter: Grow Mode
MGMOSPLINEOBJECT_GROWMODEParameter: Start
MGMOSPLINEOBJECT_GROWTH_STARTParameter: End
MGMOSPLINEOBJECT_GROWTH_ENDParameter: Offset
MGMOSPLINEOBJECT_GROWTH_OFFSETParameter: Extend Start
MGMOSPLINEOBJECT_EXTEND_EXTEND_STARTParameter: Curve
MGMOSPLINEOBJECT_EXTEND_CURVE_STARTParameter: Scaling
MGMOSPLINEOBJECT_EXTEND_SCALE_STARTParameter: Spiral
MGMOSPLINEOBJECT_EXTEND_SPIRAL_STARTParameter: Spiral Scale
MGMOSPLINEOBJECT_EXTEND_STEP_STARTParameter: Smoothed
MGMOSPLINEOBJECT_EXTEND_SMOOTHED_STARTParameter: Extend End
MGMOSPLINEOBJECT_EXTEND_EXTEND_ENDParameter: Curve
MGMOSPLINEOBJECT_EXTEND_CURVE_ENDParameter: Scaling
MGMOSPLINEOBJECT_EXTEND_SCALE_ENDParameter: Spiral
MGMOSPLINEOBJECT_EXTEND_SPIRAL_ENDParameter: Spiral Scale
MGMOSPLINEOBJECT_EXTEND_STEP_ENDParameter: Smoothed
MGMOSPLINEOBJECT_EXTEND_SMOOTHED_ENDParameter: Destination Spline
MGMOSPLINEOBJECT_DEST_SPLINEParameter: Destination X Rail
MGMOSPLINEOBJECT_DEST_RAILXParameter: Destination Y Rail
MGMOSPLINEOBJECT_DEST_RAILYParameter: Destination Polygon
MGMOSPLINEOBJECT_DEST_POLYParameter: Display Mode
MGMOSPLINEOBJECT_DISPLAYMODEParameter: Length
MGMOSPLINEOBJECT_LENGTHParameter: Length Spline
MGMOSPLINEOBJECT_LENGTH_SPLINEParameter: Length Formula
MGMOSPLINEOBJECT_LENGTH_FORMULAParameter: Steps
MGMOSPLINEOBJECT_STEPSParameter: Segments
MGMOSPLINEOBJECT_SEGMENTSParameter: Angle H
MGMOSPLINEOBJECT_ANGLE_HParameter: Angle H Spline
MGMOSPLINEOBJECT_ANGLE_H_SPLINEParameter: Angle H Formula
MGMOSPLINEOBJECT_ANGLE_H_FORMULAParameter: Angle P
MGMOSPLINEOBJECT_ANGLE_PParameter: Angle P Spline
MGMOSPLINEOBJECT_ANGLE_P_SPLINEParameter: Angle P Formula
MGMOSPLINEOBJECT_ANGLE_P_FORMULAParameter: Angle B
MGMOSPLINEOBJECT_ANGLE_BParameter: Angle B Spline
MGMOSPLINEOBJECT_ANGLE_B_SPLINEParameter: Angle B Formula
MGMOSPLINEOBJECT_ANGLE_B_FORMULAParameter: Curvature Order
MGMOSPLINEOBJECT_CURVATURE_ORDERParameter: Curve
MGMOSPLINEOBJECT_CURVEParameter: Curve Spline
MGMOSPLINEOBJECT_CURVE_SPLINEParameter: Curve Formula
MGMOSPLINEOBJECT_CURVE_FORMULAParameter: Curve Minimum
MGMOSPLINEOBJECT_CURVE_STRENGTHMINParameter: Curve Maximum
MGMOSPLINEOBJECT_CURVE_STRENGTHMAXParameter: Curve Maintain Angle
MGMOSPLINEOBJECT_CURVE_MAINTAINParameter: Curve Global Space
MGMOSPLINEOBJECT_CURVE_GLOBALParameter: Bend
MGMOSPLINEOBJECT_BENDParameter: Bend Spline
MGMOSPLINEOBJECT_BEND_SPLINEParameter: Bend Formula
MGMOSPLINEOBJECT_BEND_FORMULAParameter: Bend Minimum
MGMOSPLINEOBJECT_BEND_STRENGTHMINParameter: Bend Maximum
MGMOSPLINEOBJECT_BEND_STRENGTHMAXParameter: Bend Maintain Angle
MGMOSPLINEOBJECT_BEND_MAINTAINParameter: Bend Global Space
MGMOSPLINEOBJECT_BEND_GLOBALParameter: Twist
MGMOSPLINEOBJECT_TWISTParameter: Twist Spline
MGMOSPLINEOBJECT_TWIST_SPLINEParameter: Twist Formula
MGMOSPLINEOBJECT_TWIST_FORMULAParameter: Twist Minimum
MGMOSPLINEOBJECT_TWIST_STRENGTHMINParameter: Twist Maximum
MGMOSPLINEOBJECT_TWIST_STRENGTHMAXParameter: Twist Maintain Angle
MGMOSPLINEOBJECT_TWIST_MAINTAINParameter: Twist Global Space
MGMOSPLINEOBJECT_TWIST_GLOBALParameter: Width
MGMOSPLINEOBJECT_WIDTHParameter: Width Spline
MGMOSPLINEOBJECT_WIDTH_SPLINEParameter: Width Formula
MGMOSPLINEOBJECT_WIDTH_FORMULAParameter: Premise
MGMOSPLINEOBJECT_TURTLEParameter: Context Ignore
MGMOSPLINEOBJECT_TURTLE_CONTEXT_IGNOREParameter: Rules
MGMOSPLINEOBJECT_TURTLE_MODIFIERParameter: Result String to Console
MGMOSPLINEOBJECT_TURTLE_PRINTParameter: Growth
MGMOSPLINEOBJECT_TURTLE_GROWTHParameter: Default Angle
MGMOSPLINEOBJECT_TURTLE_BASEANGLEParameter: Default Scale
MGMOSPLINEOBJECT_TURTLE_BASESCALEParameter: Default Movement
MGMOSPLINEOBJECT_TURTLE_BASEMOVEParameter: Tropism
MGMOSPLINEOBJECT_TURTLE_BASETROPISMParameter: Randomness
MGMOSPLINEOBJECT_TURTLE_RANDOMISATIONParameter: Seed
MGMOSPLINEOBJECT_TURTLE_RANDOM_SEEDParameter: Move Multiplier
MGMOSPLINEOBJECT_TURTLE_ADDMOVEParameter: Angle Multiplier
MGMOSPLINEOBJECT_TURTLE_ADDANGLEParameter: Scale Multiplier
MGMOSPLINEOBJECT_TURTLE_ADDSCALEParameter: Grow Angle
MGMOSPLINEOBJECT_TURTLE_GROWANGLEParameter: Grow Scale
MGMOSPLINEOBJECT_TURTLE_GROWSCALEParameter: Grow Movement
MGMOSPLINEOBJECT_TURTLE_GROWMOVEParameter: Generation Mode
MGMOSPLINEOBJECT_SPLINE_MODEParameter: Count
MGMOSPLINEOBJECT_SPLINE_COUNTParameter: Step
MGMOSPLINEOBJECT_SPLINE_COUNT_STEPParameter: Source Spline
MGMOSPLINEOBJECT_SOURCE_SPLINEParameter: Source Rail
MGMOSPLINEOBJECT_SOURCE_RAILParameter: Width
MGMOSPLINEOBJECT_SPLINE_WIDTHParameter: Width Spline
MGMOSPLINEOBJECT_SPLINE_WIDTH_SPLINEParameter: Width Formula
MGMOSPLINEOBJECT_SPLINE_WIDTH_FORMULAParameter: Effectors
MGMOSPLINEOBJECT_EFFECTORLISTParameter: Mode
MGMOSPLINEOBJECT_FIELD_MODEParameter: Fields
MGMOSPLINEOBJECT_PARTICLEFIELDS