Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Dynamic Object
SIMULATIONSCENE_DYNAMICParameter: Blob Geometry
SIMULATIONSCENE_BLOBGEOMETRYParameter: Gravitational Acceleration [m/s^2]
SIMULATIONSCENE_GRAVITYParameter: Density
SIMULATIONSCENE_DENSITYParameter: Linear Damping
SIMULATIONSCENE_LINEAR_DAMPINGParameter: Angular Damping
SIMULATIONSCENE_ANGULAR_DAMPING