IMP 23078: [CEA 1498] Sewing of meshes without having to set the nodes ids

[modules/smesh.git] / doc / salome / gui / SMESH / input / sewing_meshes.doc

diff --git a/doc/salome/gui/SMESH/input/sewing_meshes.doc b/doc/salome/gui/SMESH/input/sewing_meshes.doc
index 88edc1e62e3d4c7d8d5f4c0fe43fb2c6cd0b4f70..8b7bb76c4848d79807fc7b993fe88b10fd4cfadb 100644 (file)
--- a/doc/salome/gui/SMESH/input/sewing_meshes.doc
+++ b/doc/salome/gui/SMESH/input/sewing_meshes.doc
@@ -27,7 +27,13 @@ the type of sewing operation you would like to perform.</li>
 \anchor free_borders_anchor
 <h2>Sew free borders</h2>
 
 \anchor free_borders_anchor
 <h2>Sew free borders</h2>
 

-This functionality allows you to unite two free borders of a 2D mesh.
+This functionality allows you to unite free borders of a 2D mesh.
+
+There are two working modes: \a Automatic and \a Manual. In the \b
+Automatic mode, the program finds free borders coincident within a
+certain tolerance and sew them. Optionally it is possible to adjust
+the found free borders before sewing. In the \b Manual mode you are to
+define borders to sew by picking three nodes of each border.

 
 \image html sewing1.png
 
 
 \image html sewing1.png
 


@@ -50,6 +56,16 @@ corresponding end nodes of two borders will be merged. Intermediate
 nodes of two borders will be either merged or inserted into faces of
 the opposite border.
 
 nodes of two borders will be either merged or inserted into faces of
 the opposite border.
 

+In practice the borders to sew often coincide and in this case it is
+difficult to specify the first and the last nodes of a border since
+they coincide with the first and the last nodes of the other
+border. To cope with this,
+\ref merging_nodes_page "merge" coincident nodes into one
+beforehand. Two figures below illustrate this approach.
+\image html sew_using_merge.png "Merge coincident nodes which are difficult to distinguish"
+<br>
+\image html sew_after_merge.png "After merging nodes it is easy to specify border nodes"
+

 The sewing algorithm is as follows:
 <ol>
 <li>The parameter (U) of each node within a border is computed. So
 The sewing algorithm is as follows:
 <ol>
 <li>The parameter (U) of each node within a border is computed. So