Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Lifetime Map
FP_GEOMETRYMAPS_ATTRIBUTEMAPS_LIFETIME_EXPECTATION_MAP
Parameter: Speed Map
FP_GEOMETRYMAPS_ATTRIBUTEMAPS_VELOCITY_SPEED_MAP
Parameter: Direction Map
FP_GEOMETRYMAPS_ATTRIBUTEMAPS_VELOCITY_DIRECTION_MAP
Parameter: Mix
FP_GEOMETRYMAPS_ATTRIBUTEMAPS_VELOCITY_DIRECTION_MIX
Parameter: Forward Map
FP_GEOMETRYMAPS_ATTRIBUTEMAPS_ALIGNMENT_FORWARD_MAP
Parameter: Mix
FP_GEOMETRYMAPS_ATTRIBUTEMAPS_ALIGNMENT_FORWARD_MIX
Parameter: Angular Speed Map
FP_GEOMETRYMAPS_ATTRIBUTEMAPS_ANGULARVELOCITY_SPINSPEED_MAP
Parameter: Spin Vector Map
FP_GEOMETRYMAPS_ATTRIBUTEMAPS_ANGULARVELOCITY_SPINVECTOR_MAP
Parameter: Mix
FP_GEOMETRYMAPS_ATTRIBUTEMAPS_ANGULARVELOCITY_SPINVECTOR_MIX
Parameter: Color Map
FP_GEOMETRYMAPS_ATTRIBUTEMAPS_COLOR_MAP
Parameter: Mix
FP_GEOMETRYMAPS_ATTRIBUTEMAPS_COLOR_MIX
Parameter: Radius Map
FP_GEOMETRYMAPS_ATTRIBUTEMAPS_RADIUS_MAP