For shape optimization, restrictions are defined as boundary conditions that limit the potential area of the node displacement. A design variable constraint is a restriction that directly affects the individual design variables, i.e., the individual design nodes. Since the nodes in the mesh smoothing area can be interpreted as second order design nodes, there is also the possibility to apply the restrictions (up to a limited degree) to the nodes of the mesh smoothing area. Compared to geometrical optimization based on a few parameters,
Tosca Structure.shape
allows every design node to be displaced ‘independently’ from other design nodes.