smesh/doc/salome/gui/SMESH/input/2d_meshing_hypo.doc

/*!

\page a2d_meshing_hypo_page 2D Meshing Hypotheses

<br>
<ul>
<li>\ref max_element_area_anchor "Max Element Area"</li>
<li>\ref length_from_edges_anchor "Length from Edges"</li>
<li>\ref hypo_quad_params_anchor "Quadrangle parameters"</li>
</ul>

<br>
\anchor max_element_area_anchor
<h2>Max Element Area</h2>

<b>Max Element Area</b> hypothesis is applied for meshing of 2D faces
composing your geometrical object. Definition of this hypothesis
consists of setting the <b>maximum area</b> of meshing elements (depending on
the chosen meshing algorithm it can be <b>triangles</b> or <b>quadrangles</b>),
which will compose the mesh of these 2D faces.

\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 
\ref tui_max_element_area "Maximum Element Area" hypothesis
operation. 

<br>
\anchor length_from_edges_anchor
<h2>Length from Edges</h2>

<b>Length from edges</b> hypothesis builds 2D mesh segments having a
length calculated as an average edge length for a given wire.

<b>See Also</b> a sample TUI Script of a 
\ref tui_length_from_edges "Length from Edges" hypothesis operation.

<br>
\anchor hypo_quad_params_anchor
<h2>Quadrangle parameters</h2>

<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"

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"

<b>See Also</b> a sample TUI Script of a 
\ref tui_quadrangle_parameters "Quadrangle Parameters" hypothesis.

<br>
*/