Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Mode
FP_SURFACEATTRACT_OBJECT_BEHAVIOURParameter: Radius
FP_SURFACEATTRACT_OBJECT_RADIUSParameter: Attract Strength
FP_SURFACEATTRACT_OBJECT_STRENGTH_ATTRACTParameter: Follow Strength
FP_SURFACEATTRACT_OBJECT_STRENGTH_FOLLOWParameter: Damping
FP_SURFACEATTRACT_OBJECT_DAMPINGParameter: Randomize
FP_SURFACEATTRACT_OBJECT_RANDOMIZE_TARGETParameter: Apply Object Velocity
FP_SURFACEATTRACT_OBJECT_APPLY_VELOCITYParameter: Object Velocity Strength
FP_SURFACEATTRACT_OBJECT_STRENGTH_APPLY_VELOCITYParameter: Align to Surface Rate
FP_SURFACEATTRACT_OBJECT_ALIGN_UP_TO_NORMALParameter: Switch on Contact
FP_SURFACEATTRACT_OBJECT_CONTACTBEHAVIOUR_SWITCHGROUPParameter: Target Group
FP_SURFACEATTRACT_OBJECT_TARGET_GROUPParameter: Create Group
FP_SURFACEATTRACT_OBJECT_TARGET_GROUP_CREATEParameter: Mode
FP_SURFACEATTRACT_OBJECT_ELEMENTS_INEXMODEParameter: Simulation Tags
FP_SURFACEATTRACT_OBJECT_ELEMENTSParameter: Select Geometry to attract towards
FP_SURFACEATTRACT_OBJECT_SELECT_GEOMETRY