Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Device
PBDSCENE_DEVICEParameter: Gravity
PBDSCENE_DEFAULTGRAVITYParameter: Scene Scale
PBDSCENE_SCENESCALEParameter: Substeps
PBDSCENE_SUBSTEPSParameter: Constraints Solver
PBDSCENE_CONSTRAINTSOLVERParameter: Iterations
PBDSCENE_ITERATIONSParameter: Smoothing Iterations
PBDSCENE_SMOOTHINGITERATIONSParameter: Simulate Before Generators
PBDSCENE_EVALUATEBEFOREGENERATORSParameter: Damping
PBDSCENE_DAMPINGParameter: Collision Passes
PBDSCENE_COLLISIONPASSESParameter: Post Collision Passes
PBDSCENE_POSTCOLLISIONPASSESParameter: Polish Iterations
PBDSCENE_POLISHITERATIONSParameter: Document Frame Range
PBDSCENE_USEDOCUMENT_RANGEParameter: Start Frame
PBDSCENE_SIMULATION_FROMParameter: End Frame
PBDSCENE_SIMULATION_TOParameter: Elements
PBDSCENE_TAGSParameter: Forces
PBDSCENE_FORCES