Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Create N-gon
MDATA_UNTRIANGULATE_NGONS_DESC
Parameter: Flatness Angle
MDATA_UNTRIANGULATE_ANGLE_DESC
Parameter: Angle
MDATA_UNTRIANGULATE_ANGLE_RAD_DESC
Parameter: Internal Angle
MDATA_UNTRIANGULATE_USE_ANGLE_DERIVATION
Parameter: Angle
MDATA_UNTRIANGULATE_ANGLE_DERIVATION
Parameter: Alignment Angle
MDATA_UNTRIANGULATE_USE_ALIGNMENT_DERIVATION
Parameter: Angle
MDATA_UNTRIANGULATE_ALIGNMENT_DERIVATION
Parameter: Keep UV Boundary
MDATA_UNTRIANGULATE_RESPECTUVBOUNDARY
Parameter: Keep Phong Edge Breaks
MDATA_UNTRIANGULATE_RESPECTSHADINGBREAKS
Parameter: Keep Mesh Attributes
MDATA_UNTRIANGULATE_RESPECTPOLYATTRIBUTES