/*! \page double_nodes_page Duplicate Nodes \n This operation allows to duplicate nodes of your mesh, which can be useful to emulate a crack in the model. Duplication consists in replacement of an existing mesh element by another one. Lower level elements of the duplicated ones are cloned automatically. To duplicate nodes:
  1. From the \b Modification menu choose \b Transformation -> \b Duplicate \b Nodes item or click "Duplicate Nodes" button in the toolbar.
    \image html duplicate_nodes.png "Duplicate Nodes button"
  2. Check in the dialog box one of two radio buttons corresponding to the type of nodes duplication operation you would like to perform.
  3. Fill the other fields available in the dialog box (depends on the chosen operation mode).
  4. Click the \b Apply or Apply and Close button to perform the operation of nodes duplication.
\n "Duplicate Nodes" dialog has two working modes:
\anchor mode_without_elem_anchor

Without duplication of border elements

In this mode the dialog looks like: \image html duplicate01.png Parameters to be defined in this mode:
\anchor mode_with_elem_anchor

With duplication of border elements

In this mode the dialog looks like: \image html duplicate02.png Parameters to be defined in this mode:
See Also a sample TUI Script of a \ref tui_duplicate_nodes "Duplicate nodes" operation. */