Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Orientation
MG_HONEYCOMB_ORIENTATION
Parameter: Offset Direction
MG_HONEYCOMB_DIRECTION
Parameter: Offset
MG_HONEYCOMB_OFFSET
Parameter: Offset Variation
MG_HONEYCOMB_OFFSET_VARIATION
Parameter: Perpendicular Variation
MG_HONEYCOMB_VARIATION
Parameter: Seed
MG_HONEYCOMB_SEED
Parameter: Count Width
MG_HONEYCOMB_COUNT_X
Parameter: Count Height
MG_HONEYCOMB_COUNT_Y
Parameter: Mode
MG_HONEYCOMB_MODE
Parameter: Size Width
MG_HONEYCOMB_SIZE_X
Parameter: Size Height
MG_HONEYCOMB_SIZE_Y
Parameter: Form
MG_HONEYCOMB_FORM
Parameter: Spline
MG_HONEYCOMB_FORMOBJECT_LINK