create regular (possessing even sides) elements.</li>
</ul>
+\image html netgen3d_simple.png
+
+<b>Netgen 2D simple parameters</b> and <b>Netgen 3D simple parameters</b> allow defining the size of elements for each dimension. <br>
+
+\b 1D group allows defining the size of 1D elements in either of two ways:
+<ul>
+<li><b>Number of Segments</b> has the same sense as \ref
+number_of_segments_anchor "Number of segments" hypothesis with
+equidistant distribution.</li>
+<li><b>Average Length</b> has the same sense as \ref
+average_length_anchor "Average Length" hypothesis.</li>
+</ul>
+
+\b 2D group allows defining the size of 2D elements
+<ul>
+<li><b>Length from edges</b> if checked in, acts like \ref
+length_from_edges_anchor "Length from Edges" hypothesis, else </li>
+<li><b>Max. Element Area</b> defines the maximum element area like \ref
+max_element_area_anchor "Max Element Area" hypothesis. </li>
+</ul>
+
+\b 3D groups allows defining the size of 3D elements.
+<ul>
+<li><b>Length from faces</b> if checked in, the area of sides of
+volumic elements will be equal to an average area of 2D elements, else </li>
+<li><b>Max. Element Volume</b> defines the maximum element volume like
+\ref max_element_volume_hypo_page "Max Element Volume"
+hypothesis.</li>
+<ul>
+
+\n Note that Netgen algorithm does not strictly follow the input
+parameters. The actual mesh can be more or less dense than required. There are several factors in it:
+<ol>
+<li> NETGEN does not actually use "NbOfSegments" parameter for discretization of
+edge. This parameter is used only to define the local element size (size at the given point), so local sizes of adjacent edges influence each other. </li>
+<li> NETGEN additionally restricts the element size according to edge curvature.</li>
+<li> The local size of edges influences the size of close triangles.</li>
+<li> The order of elements and their size in the 1D mesh generated by
+NETGEN differ from those in the 1D mesh generated by Regular_1D
+algotithm, resulting in different 2D and 3D meshes.</li>
+</ol>
*/
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