with specified tolerance; each group of the coincident nodes can be
then converted to the single node.
-\image html mergenodes_ico.png "Merge nodes button"
+\image html mergenodes_ico.png "Merge nodes menu button"
<em>To merge nodes of your mesh:</em>
<ol>
-<li>From the \b Modification choose \b Transformation and from its
-sub-menu select the <b>Merge nodes</b> item. The following dialog box
-shall appear:</li>
+<li>Choose \b Modification -> \b Transformation -> <b>Merge nodes</b>
+ menu item. The following dialog box shall appear:</li>
<br>
\image html mergenodes_auto.png
<br>
<ul>
<li>\b Name is the name of the mesh whose nodes will be merged.</li>
-<li>\b Automatic or \b Manual Mode allows choosing how the nodes are
+<li>\b Automatic or \b Manual mode allows choosing how the nodes are
processed.
<li>\b Tolerance is a maximum distance between nodes sufficient for
merging.</li>
+<li>Activation of <b>No merge of corner and medium nodes</b> check-box
+ prevents merging medium nodes of quadratic elements with corner
+ nodes. This check-box is enabled provided that the selected mesh
+ includes quadratic elements.</li>
<li><b>Exclude Groups</b> group box allows to ignore the nodes which
-belong to the specified mesh groups.
+belong to the specified mesh groups.</li>
+<li><b>Nodes to keep</b> group box allows to specify nodes to keep in
+ the mesh. (By default a node being the first in a group of
+ coincident nodes is kept.) It is possible to either select nodes in
+ the Viewer or select groups of any element type whose nodes will be
+ kept.
+ <ol>
+ <li>\a Selection button activates selection of nodes to keep.</li>
+ <li><b>Node IDs</b> button activates selection of nodes in the
+ Viewer.</li>
+ <li><b>Groups and Sub-meshes</b> button activates selection of
+ groups and sub-meshes.</li>
+ <li>\b Add button adds selected nodes or groups to the list.</li>
+ <li> Nodes or groups selected in the list can be removed using \b
+ Remove button.</li>
+ </ol>
+</li>
</ul>
<li><b>Automatic mode:</b>
<b>Exclude Groups</b> will be not taken into account.</li>
</ul>
</li><br>
-<li>If the \b Manual Mode is selected, additional controls are available:
+<li> The \b Manual mode gives you full control of what the operation will do.
+In this mode additional controls are available:
<ul>
<li>\b Detect button generates the list of coincident nodes for the given
\b Tolerance.</li>
<li><b>Coincident nodes</b> is a list of groups of nodes for
-merging. All nodes of each group will form one after the
-operation.
+ merging. After the operation all nodes of each group will
+ be united into one node. The first node of a group is kept and
+ the others are removed.
<ul>
<li>\b Remove button deletes the selected group from the list.</li>
<li>\b Add button adds to the list a group of nodes selected in the
viewer with pressed "Shift" key.</li>
-<li><b>Select all</b> checkbox selects all groups.</li>
+<li><b>Select all</b> check-box selects all groups.</li>
+<li><b>Show double nodes IDs</b> check-box shows/hides identifiers of
+nodes of selected groups in the 3D viewer.</li>
</ul>
<br>
<br>
</li>
<li><b>Edit selected group</b> list allows editing the selected
-group:
-<br><br>
-\image html add.png
-<center>adds to the group the node selected in the viewer.</center>
-<br>
-\image html remove.png
-<center>removes from the group the selected node.</center>
-<br>
-\image html sort.png
-<center>moves the selected node to the first position in the
-group. This means that all other nodes will be merged into this
-one.</center><br>
+ group:
+ <br><br>
+ \image html add.png
+ <center>adds to the group the nodes selected in the viewer.</center>
+ <br>
+ \image html remove.png
+ <center>removes from the group the selected nodes.</center>
+ <br>
+ \image html sort.png
+ <center>moves the selected node to the first position in the
+ group in order to keep it in the mesh.</center><br>
</li>
</ul>
</li>
<li>To confirm your choice click \b Apply or <b>Apply and Close</b> button.</li>
</ol>
-\image html merging_nodes1.png "The initial obgect"
+\image html merging_nodes1.png "The initial object"
-\image html merging_nodes2.png "The object has been merged with a very big tolerance"
+\image html merging_nodes2.png "The object has been merged"
<br><b>See Also</b> a sample TUI Script of a
\ref tui_merging_nodes "Merge Nodes" operation.
