Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Size
PRIM_FRACTAL_LEN
Parameter: Width Segments
PRIM_FRACTAL_SUBW
Parameter: Depth Segments
PRIM_FRACTAL_SUBH
Parameter: Rough Furrows
PRIM_FRACTAL_ROUGH
Parameter: Fine Furrows
PRIM_FRACTAL_FINE
Parameter: Scale
PRIM_FRACTAL_SCALE
Parameter: Sea Level
PRIM_FRACTAL_BLEVEL
Parameter: Plateau Level
PRIM_FRACTAL_TLEVEL
Parameter: Multifractal
PRIM_FRACTAL_MULTIFRACTAL
Parameter: Seed
PRIM_FRACTAL_SEED
Parameter: Borders At Sea Level
PRIM_FRACTAL_BORDERS
Parameter: Spherical
PRIM_FRACTAL_SPHERICAL
Parameter: Switch to Updated Landscape
PRIM_FRACTAL_SWITCH_TO_UPDATED