Rigid Body Box ============== A rigid body box is a rectangular prism of uniform density. The box has length defined in the X-axis, width defined in the Y-axis, and height defined in the Z-axis, where (X, Y, Z) are the basis vectors of the body fixed frame. **Keyword Arguments** :param str name: Key to be used when referencing this box. :param str ref_point_key: Key of the point to which this box is attached, either at its CG, aft, or forward ends. :param str ref_frame_key: Key of the frame to which this box orientation is defined. :param numeric density: Uniform density of this box. :param numeric length: Dimension of this box in the X-axis of the body-fixed frame. :param numeric width: Dimension of this box in the Y-axis of the body-fixed frame. :param numeric height: Dimension of this box in the Z-axis of the body-fixed frame. :param str attach_to: CG, fore, or aft :return str: Message about the created box