\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
\anchor hypo_quad_params_anchor
<h2>Quadrangle parameters</h2>
-<b>Quadrangle parameters</b> is a general hypothesis for
-Quadrangle (Mapping). This hypothesis gives a possibility
-of using Quadrangle (Mapping) mechanism for faces built on 3 edges.
-The hypothesis requires some vertex to be selected from the face; this vertex will be
-used as degenerated edge. The resulting mesh will include several triangles near this
-vertex. Hypothesis construction and resulting mesh is displayed at the following figures:
+<b>Quadrangle parameters</b> is a hypothesis for
+Quadrangle (Mapping), which allows using this algorithm for meshing of
+triangular faces.In this case it is necessary to select the <b>Base vertex</b>
+used as a degenerated edge.
+
+\image html hypo_quad_params_1.png "A face built from 3 edges"
+
+\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"
-\image html hypo_quad_params_1.png
+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.png
+\image html hypo_quad_params_res_2.png "The resulting meshes"
<br>
\anchor quadrangle_preference_anchor
