+not possible.
+- <b>Optimize</b> - if this box is checked in, the algorithm will try to
+create regular (possessing even sides) elements.
+
+\image html netgen3d_local_size.png
+
+- <b>Local sizes</b> - allows to define size of elements on and
+around specified geometrical edges and vertices. To define the local
+size it is necessary to select a geometrical edge or vertex in the
+object browser or in the viewer, and to click <b>On Edge</b> or <b>On
+Vertex</b> correspondingly. <b>Name</b> of the geometrical object and
+a default <b>Value</b> will be added in the table where the
+<b>Value</b> can be changed.
+- <b>Remove</b> - deletes a selected row from the table.
+
+\image html netgen2d3d_simple.png
+
+<b>Netgen 2D simple parameters</b> and <b>Netgen 3D simple
+parameters</b> allow defining the size of elements for each
+dimension.
+
+\b 1D group allows defining the size of 1D elements in either of two ways:
+- <b>Number of Segments</b> has the same sense as \ref
+number_of_segments_anchor "Number of segments" hypothesis with
+equidistant distribution.
+- <b>Local Length</b> has the same sense as \ref
+average_length_anchor "Local Length" hypothesis.
+
+\b 2D group allows defining the size of 2D elements
+- <b>Length from edges</b> if checked in, acts like \ref
+length_from_edges_anchor "Length from Edges" hypothesis, else
+- <b>Max. Element Area</b> defines the maximum element area like \ref
+max_element_area_anchor "Max Element Area" hypothesis.
+- <b>Allow Quadrangles</b> - allows to use quadrangle elements in a
+triangle 2D mesh. This checkbox is not present in Netgen 3D simple parameters
+because currently building a tetrahedral mesh with quadrangle faces is
+not possible.
+
+\b 3D groups allows defining the size of 3D elements.
+- <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
+- <b>Max. Element Volume</b> defines the maximum element volume like
+\ref max_element_volume_hypo_page "Max Element Volume"
+hypothesis.
+
+\note 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:
+- 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.
+- NETGEN additionally restricts the element size according to edge curvature.
+- The local size of edges influences the size of close triangles.
+- 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.
