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+.. _radial_quadrangle_1D2D_algo_page:
+
+***********************
+Radial Quadrangle 1D-2D
+***********************
+
+This algorithm applies to the meshing of 2D shapes under the
+following conditions: the face must be a full ellipse or a part of ellipse
+(i.e. the number of edges is less or equal to 3 and one of them is an ellipse curve).
+The resulting mesh consists of triangles (near the center point) and
+quadrangles.
+
+This algorithm is optionally parametrized by the hypothesis indicating
+the number of mesh layers along the radius. The distribution of layers
+can be set with any 1D Hypothesis. If the face boundary includes
+radial edges, this distribution is applied to the longest radial
+edge. If the face boundary does not include radial edges, this
+distribution is applied to the longest virtual radial edge. The
+distribution is applied to the longest radial edge starting from its
+end lying on the elliptic curve.
+
+
+If no own hypothesis of the algorithm is assigned, any local or global
+hypothesis is used by the algorithm to discretize edges.
+
+If no 1D hypothesis is assigned to an edge, 
+:ref:`Default Number of Segments <nb_segments_pref>` preferences
+parameter is used to discretize the edge.
+
+.. image:: ../images/hypo_radquad_dlg.png
+	:align: center
+
+.. image:: ../images/mesh_radquad_01.png 
+	:align: center
+
+.. centered::
+	Radial Quadrangle 2D mesh on the top and the bottom faces of a cylinder
+
+.. image:: ../images/mesh_radquad_02.png 
+	:align: center
+
+.. centered::
+	Radial Quadrangle 2D mesh on a part of circle
+
+**See also** a sample :ref:`TUI Script <tui_radial_quadrangle>`.
+
+