Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Mode
FP_MESHEMITTER_MESH_MODEParameter: Voxel Size
FP_MESHEMITTER_MESH_VOXELSIZEParameter: Scatter
FP_MESHEMITTER_MESH_SCATTERParameter: Restriction
FP_MESHEMITTER_MESH_RESTRICTIONParameter: Born
FP_MESHEMITTER_OUTPUT_BORNParameter: FP_MESHEMITTER_OUTPUT_BORN_ATTRIBUTE_NAME
FP_MESHEMITTER_OUTPUT_BORN_ATTRIBUTE_NAMEParameter: Create
FP_MESHEMITTER_OUTPUT_BORN_ATTRIBUTE_CREATEParameter: Point Index
FP_MESHEMITTER_OUTPUT_POINTINDEXParameter: FP_MESHEMITTER_OUTPUT_POINTINDEX_ATTRIBUTE_NAME
FP_MESHEMITTER_OUTPUT_POINTINDEX_ATTRIBUTE_NAMEParameter: Create
FP_MESHEMITTER_OUTPUT_POINTINDEX_ATTRIBUTE_CREATEParameter: Barycentric Coordinates
FP_MESHEMITTER_OUTPUT_BARYCENTRICCOORDINATEParameter: FP_MESHEMITTER_OUTPUT_BARYCENTRICCOORDINATE_ATTRIBUTE_NAME
FP_MESHEMITTER_OUTPUT_BARYCENTRICCOORDINATE_ATTRIBUTE_NAMEParameter: Create
FP_MESHEMITTER_OUTPUT_BARYCENTRICCOORDINATE_ATTRIBUTE_CREATEParameter: Normal
FP_MESHEMITTER_OUTPUT_NORMALParameter: FP_MESHEMITTER_OUTPUT_NORMAL_ATTRIBUTE_NAME
FP_MESHEMITTER_OUTPUT_NORMAL_ATTRIBUTE_NAMEParameter: Create
FP_MESHEMITTER_OUTPUT_NORMAL_ATTRIBUTE_CREATEParameter: UVW Coordinates
FP_MESHEMITTER_OUTPUT_UVWParameter: FP_MESHEMITTER_OUTPUT_UVW_ATTRIBUTE_NAME
FP_MESHEMITTER_OUTPUT_UVW_ATTRIBUTE_NAMEParameter: Create
FP_MESHEMITTER_OUTPUT_UVW_ATTRIBUTE_CREATEParameter: Draw Geometry
FP_MESHEMITTER_DRAW_GEOMETRY