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>
<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. As result of the operation all nodes of each group will be
- replaces by the firts node of the group.
+ 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>Show double nodes IDs</b> checkbox shows/hides identifiers of
+<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>
\image html sort.png
<center>moves the selected node to the first position in the
- group. This means that all other nodes of the group will be
- replaced by this one.</center><br>
+ 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.