\image html a-maxelarea.png
+\n
+
\image html max_el_area.png "In this example, Max. element area is very small compared to the 1D hypothesis"
<b>See Also</b> a sample TUI Script of a
\image html hypo_quad_params_res.png "The resulting mesh"
+This hypothesis can be also used to mesh a segment of a circular face.
+Please, consider that there is a limitation on the selectiion of the degenerated
+vertex for the faces built with the angle > 180 degrees (see the picture).
+
+\image html hypo_quad_params_2.png "3/4 of a circular face"
+
+In this case, selection of a wrong vertex for the <b>Quadrangle parameters</b>
+hypothesis will generate a wrong mesh. The picture below
+shows the good (left) and the bad (right) results of meshing.
+
+\image html hypo_quad_params_res_2.png "The resulting meshes"
+
<br>
\anchor quadrangle_preference_anchor
<h2>Quadrangle Preference</h2>
-This algorithm can be used only together with Quadrangle (Mapping)
-algorithm. It allows to build quadrangular meshes even if the number
+This algorithm can be used together with Quadrangle (Mapping) and Netgen 2D
+algorithms.
+
+It allows Netgen 2D to build quadrangular meshes at any conditions.
+
+It allows Quadrangle (Mapping) to build quadrangular meshes even if the number
of nodes at the opposite edges of a meshed face is not equal,
otherwise this mesh will contain some triangular elements.
<br>
This hypothesis has one restriction on its work: the total quantity of
segments on all four sides of the face must be even (divisible by 2).
+
<br>
\anchor triangle_preference_anchor
<h2>Triangle Preference</h2>
