X-Git-Url: http://git.salome-platform.org/gitweb/?a=blobdiff_plain;f=doc%2Fsalome%2Fgui%2FSMESH%2Finput%2Fnetgen_2d_3d_hypo.doc;h=2e5c5b90c5f6aa14d42d941392c685fd42fcecad;hb=8657df1e187624e58dba346431c3fa422c16e782;hp=395283ca10e739ecdc5e6a8deaf87d7c255adb25;hpb=79b1ac2b6df9117f16f11d444b1f165d477a1813;p=modules%2Fsmesh.git
diff --git a/doc/salome/gui/SMESH/input/netgen_2d_3d_hypo.doc b/doc/salome/gui/SMESH/input/netgen_2d_3d_hypo.doc
index 395283ca1..2e5c5b90c 100644
--- a/doc/salome/gui/SMESH/input/netgen_2d_3d_hypo.doc
+++ b/doc/salome/gui/SMESH/input/netgen_2d_3d_hypo.doc
@@ -34,4 +34,45 @@ not possible.
create regular (possessing even sides) elements.
+\image html netgen3d_simple.png
+
+Netgen 2D simple parameters and Netgen 3D simple parameters allow defining the size of elements for each dimension.
+
+\b 1D group allows defining the size of 1D elements in either of two ways:
+
+- Number of Segments has the same sense as \ref
+number_of_segments_anchor "Number of segments" hypothesis with
+equidistant distribution.
+- Average Length has the same sense as \ref
+average_length_anchor "Average Length" hypothesis.
+
+
+\b 2D group allows defining the size of 2D elements
+
+- Length from edges if checked in, acts like \ref
+length_from_edges_anchor "Length from Edges" hypothesis, else
+- Max. Element Area defines the maximum element area like \ref
+max_element_area_anchor "Max Element Area" hypothesis.
+
+
+\b 3D groups allows defining the size of 3D elements.
+
+- Length from faces if checked in, the area of sides of
+volumic elements will be equal to an average area of 2D elements, else
+- Max. Element Volume defines the maximum element volume like
+\ref max_element_volume_hypo_page "Max Element Volume"
+hypothesis.
+
+
+\n Note that Netgen algorithm does not strictly follow the input
+parameters. The actual mesh can be more or less dense than required. There are several factors in it:
+
+- NETGEN does not actually use "NbOfSegments" parameter for discretization of
+edge. This parameter is used only to define the local element size (size at the given point), so local sizes of adjacent edges influence each other.
+- NETGEN additionally restricts the element size according to edge curvature.
+- The local size of edges influences the size of close triangles.
+- The order of elements and their size in the 1D mesh generated by
+NETGEN differ from those in the 1D mesh generated by Regular_1D
+algotithm, resulting in different 2D and 3D meshes.
+
*/
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