\n GHS3D Parameters hypothesis works only with <b>Tetrahedron (GHS3D)</b>
algorithm. This algorithm is a commercial software.
+<h1>General parameters</h1>
+
\image html ghs3d_parameters_basic.png
<ul>
optimisation provides better mesh, but can be time-consuming.
</li>
+<h1>Advanced parameters</h1>
+
\image html ghs3d_parameters_advanced.png
<li><b>Maximum memory size</b> - launches ghs3d software with
<li><b>To create new nodes</b> - if this option is checked off, ghs3d
tries to create tetrahedrons using only the nodes of the 2D mesh.</li>
+<li><b>To remove the initial central point</b> TetMesh-GHS3D adds an internal point
+at the gravity centre of the bounding box to speed up and to simplify
+the meshing process. However, it is possible to refrain from creating
+this point by using the command line option -no initial central point. This can be
+particularly useful to generate a volume mesh without internal points at all and in some rare cases
+at the boundary regeneration phase when it is impossible to proceed
+with the standard options
+(for example, when one dimension of the domain is more than 20 times greater than the other two).
+Use this option if the boundary regeneration has failed with the standard parameters and before using
+the recovery version (command line option -C).
+Note: when using this option, the speed of the meshing process may
+decrease, and the quality may change.
+Note: the boundary regeneration may fail with this option, in some rare cases.</li>
+
<li><b>To use boundary recovery version</b> - enables using a
boundary recovery module which tries to
create volume meshes starting from very poor quality surface meshes
quality (poor aspect ratio of elements, tetrahedra with a very small
positive volume).</li>
-<li><b>Option as text</b> - allows input of any text as command line
-for ghs3d. This allows the input of advanced options in a free from. </li>
+<li><b>To use FEM correction</b> - Applies finite-element correction by
+replacing overconstrained elements where it is possible. At first the process
+slices the overconstrained edges and at second the overconstrained
+facets. This ensures that there are no edges with two boundary
+vertices and that there are no facets with three boundary vertices. TetMesh-GHS3D gives the initial
+and final overconstrained edges and facets. It also gives the facets
+which have three edges on the boundary.
+Note: when using this option, the speed of the meshing process may
+decrease, quality may change, and the smallest volume may be smaller.
+By default, the FEM correction is not used.</li>
+
+<li><b>Option as text</b> - allows to input in the command line any text
+for ghs3d, for example, advanced options. </li>
+
+</ul>
+
+<h1>Enforced vertices</h1>
+
+\image html ghs3d_enforced_vertices.png
+
+GHS3D algorithm can locally make the mesh finer. It is possible to define enforced vertices in the volume where the mesh will be detailed.
+
+A node will be created at the enforced vertex coordinates. There is no need to create a vertex in CAD.
+
+An enforced vertex is defined by:
+<ul>
+<li>The (x,y,z) cartesian coordinates</li>
+<li>A constant physical size</li>
</ul>
-*/
\ No newline at end of file
+<br><b>See Also</b> a sample TUI Script of the \ref tui_ghs3d "creation of a Ghs3D hypothesis", including enforced vertices.
+
+
+*/
