\page make_2dmesh_from_3d_page Generate boundary elements
\n This functionality allows to generate mesh elements on the borders of
-elements of a higher dimension.
+elements of a higher dimension, for example, to create 2D elements
+around a block of 3D elements as in the following figure.
+
+\image html 2d_from_3d_example.png "Missing 2D elements were generated"
<em>To generate border elements:</em>
<ol>
\n "Create boundary elements" dialog allows creation of boundary elements
of two types.
<ul>
-<li><b>2D from 3D</b> creates mesh faces on free facets of volume elements</li>
-<li><b>1D from 2D</b> creates mesh edges on free edges of mesh faces</li>
+<li><b>2D from 3D</b> creates missing mesh faces on free facets of volume elements</li>
+<li><b>1D from 2D</b> creates missing mesh edges on free edges of mesh faces</li>
</ul>
Here a <em>free facet</em> means a facet shared by only one volume, a <em>free edge</em>
means an edge shared by only one mesh face.
<ul>
<li><b>This mesh</b> adds elements in the selected mesh.</li>
<li><b>New mesh</b> adds elements to a new mesh. The new mesh appears
- in the Object Browser with the name that you can change in the adjacent box. </li>
+ in the Object Browser with the name that you can change in the adjacent box. </li>
</ul></li>
<li>activate <b>Copy source mesh</b> checkbox to copy all elements of
the selected mesh to the new mesh, else the new mesh will contain only
