Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Scale
FORGERIO_SCALE_FACTOR_EXPORTParameter: UVs
FORGERIO_EXPORT_UVWParameter: Vertex Colors
FORGERIO_EXPORT_POLYPAINTParameter: Polygon Groups
FORGERIO_EXPORT_POLYGROUPParameter: Connect With Children
FORGERIO_EXPORT_CONNECTWITHCHILDRENParameter: Materials
FORGERIO_EXPORT_MATERIALSParameter: FORGERIO_EXPORT_WARNING
FORGERIO_EXPORT_WARNING