Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Radius
MDATA_CLOUD_CREATE_BRUSH_RAD
Parameter: Density
MDATA_CLOUD_CREATE_DENSITY
Parameter: Maximum Size
MDATA_CLOUD_CREATE_MAX_SIZE
Parameter: Threshold
MDATA_CLOUD_DRAW_THRESHOLD
Parameter: Clear
MDATA_CLOUD_CLEAR
Parameter: Fill Plane
MDATA_CLOUD_FILL_PLANE
Parameter: Fill Sphere
MDATA_CLOUD_FILL_SPHERE
Parameter: Distance
MDATA_CLOUD_SMOOTH_B_DIST
Parameter: Variance
MDATA_CLOUD_SMOOTH_B_VAR
Parameter: Shape
MDATA_CLOUD_SMOOTH_B_SPLINE
Parameter: Smooth Borders
MDATA_CLOUD_SMOOTH_BORDERS
Parameter: Strength
MDATA_CLOUD_SMOOTH_A_STR
Parameter: Variance
MDATA_CLOUD_SMOOTH_A_VARIANCE
Parameter: Smooth All
MDATA_CLOUD_SMOOTH_ALL
Parameter: Remap
MDATA_CLOUD_REMAP_SPLINE
Parameter: Remap
MDATA_CLOUD_REMAP
Parameter: Quality
MDATA_CLOUD_DISPLAY_QUALITY
Parameter: Render Preview
MDATA_RENDERPREVIEW_BTN