<li>\subpage smoothing_page "Smooth" elements, reducung distortions in
them by adjusting the locations of element corners.</li>
<li>Create an \subpage extrusion_page "extrusion" along a vector.</li>
<li>\subpage smoothing_page "Smooth" elements, reducung distortions in
them by adjusting the locations of element corners.</li>
<li>Create an \subpage extrusion_page "extrusion" along a vector.</li>