Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Mix
FP_COLORMAPPER_MIX
Parameter: Source
FP_COLORMAPPER_SOURCE_MODE
Parameter: Lower
FP_COLORMAPPER_MINFLOAT
Parameter: Upper
FP_COLORMAPPER_MAXFLOAT
Parameter: Gradient
FP_COLORMAPPER_GRADIENT
Parameter: Repeat
FP_COLORMAPPER_REPEAT
Parameter: Alpha Only
FP_COLORMAPPER_ALPHAONLY
Parameter: Field
FP_COLORMAPPER_FIELDLIST
Parameter: FP_COLORMAPPER_DRAW_DISTANCE
FP_COLORMAPPER_DRAW_DISTANCE