Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Falloff
ID_CA_COLLISION_DEFORMER_OBJECT_COORDSParameter: Distance
ID_CA_COLLISION_DEFORMER_OBJECT_DISTANCEParameter: Strength
ID_CA_COLLISION_DEFORMER_OBJECT_FALLOFF_STRENGTHParameter: Restore Shape
ID_CA_COLLISION_DEFORMER_OBJECT_RESTORESHAPEParameter: Curve
ID_CA_COLLISION_DEFORMER_OBJECT_FALLOFFParameter: Solver
ID_CA_COLLISION_DEFORMER_MOTIONParameter: Objects
ID_CA_COLLISION_DEFORMER_OBJECT_COLLIDERSParameter: Objects
ID_CA_COLLISION_DEFORMER_OBJECTSParameter: Stretch/Relax
ID_CA_COLLISION_DEFORMER_OBJECT_STRETCH_MAPParameter: Falloff
ID_CA_COLLISION_DEFORMER_OBJECT_FALLOFF_MAPParameter: Restore
ID_CA_COLLISION_DEFORMER_OBJECT_RESTORE_MAPParameter: Collision
ID_CA_COLLISION_DEFORMER_OBJECT_COLLISION_MAPParameter: Invert
ID_CA_COLLISION_DEFORMER_OBJECT_COLLISION_MAP_INVERTParameter: Falloff
ID_CA_COLLISION_DEFORMER_OBJECT_DISTANCE_MAPParameter: Invert
ID_CA_COLLISION_DEFORMER_OBJECT_DISTANCE_MAP_INVERTParameter: Enable
ID_CA_COLLISION_DEFORMER_OBJECT_CACHE_ENABLEParameter: Compress
ID_CA_COLLISION_DEFORMER_OBJECT_CACHE_COMPRESSEDParameter: Calculate
ID_CA_COLLISION_DEFORMER_OBJECT_CACHE_CALCULATEParameter: Update
ID_CA_COLLISION_DEFORMER_OBJECT_CACHE_UPDATEParameter: Empty Cache
ID_CA_COLLISION_DEFORMER_OBJECT_CACHE_DELETEParameter: Load...
ID_CA_COLLISION_DEFORMER_OBJECT_CACHE_CACHE_LOADParameter: Save...
ID_CA_COLLISION_DEFORMER_OBJECT_CACHE_CACHE_SAVEParameter: Auto Time
ID_CA_COLLISION_DEFORMER_OBJECT_CACHE_AUTOTIMEParameter: Start
ID_CA_COLLISION_DEFORMER_OBJECT_CACHE_STARTParameter: Stop
ID_CA_COLLISION_DEFORMER_OBJECT_CACHE_STOPParameter: Offset
ID_CA_COLLISION_DEFORMER_OBJECT_CACHE_OFFSETParameter: Scale
ID_CA_COLLISION_DEFORMER_OBJECT_CACHE_TIMESCALEParameter: Cache
ID_CA_COLLISION_DEFORMER_OBJECT_CACHE_CACHE_LIMITParameter: Size
ID_CA_COLLISION_DEFORMER_OBJECT_SIZEParameter: Steps
ID_CA_COLLISION_DEFORMER_OBJECT_SAMPLINGParameter: Stretch
ID_CA_COLLISION_DEFORMER_OBJECT_ITERParameter: Relax
ID_CA_COLLISION_DEFORMER_OBJECT_RELAX_ITERParameter: Stiffness
ID_CA_COLLISION_DEFORMER_OBJECT_STIFFParameter: Struct
ID_CA_COLLISION_DEFORMER_OBJECT_STRUCTParameter: Flex
ID_CA_COLLISION_DEFORMER_OBJECT_FLEX