\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. Note that Netgen algorithm does not strictly follow the input parameters. The actual mesh can be more or less dense than required.<br>
+<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>
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
+algorithm, resulting in different 2D and 3D meshes.</li>
+</ol>
*/
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