Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Target Property
FP_COLORMAPPER_TARGET_ATTRIBUTESParameter: FP_COLORMAPPER_TARGET_ATTRIBUTES_CUSTOM_NAME
FP_COLORMAPPER_TARGET_ATTRIBUTES_CUSTOM_NAMEParameter: Mix
FP_COLORMAPPER_MIXParameter: Source
FP_COLORMAPPER_SOURCE_MODEParameter: Lower
FP_COLORMAPPER_MINFLOATParameter: Upper
FP_COLORMAPPER_MAXFLOATParameter: Lower
FP_COLORMAPPER_MININTParameter: Upper
FP_COLORMAPPER_MAXINTParameter: Gradient
FP_COLORMAPPER_GRADIENTParameter: Repeat
FP_COLORMAPPER_REPEATParameter: Alpha Only
FP_COLORMAPPER_ALPHAONLYParameter: Field
FP_COLORMAPPER_FIELDLISTParameter: FP_COLORMAPPER_DRAW_DISTANCE
FP_COLORMAPPER_DRAW_DISTANCE