c4d_objects/description/ftorus.hParameters are accessed with cinema::C4DAtom::GetParameter() and cinema::C4DAtom::SetParameter(). See Parameters.
Parameter: Radius
FIELD_TORUS_RADIUSParameter: Thickness
FIELD_TORUS_THICKNESSParameter: Direction
FIELD_TORUS_DIRECTIONFIELD_TORUS_DIRECTION_XPFIELD_TORUS_DIRECTION_YPFIELD_TORUS_DIRECTION_ZPParameter: Clip to Shape
FIELD_TORUS_CLIP