smesh/doc/gui/input/add_node_on_segment.rst

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.. _add_node_on_segment_page:
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Cutting triangles
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This operation cuts triangles into two by adding a node on an edge bounding these triangles.
.. image:: ../images/add_node_on_segment.png
:align: center
*To cut triangles:*
.. |img| image:: ../images/mesh_split_diag_interactive.png
#. Select a mesh and display it in the 3D Viewer.
#. In the **Modification** menu select the **Add node on segment** item or click *"Add node on segment"* button |img| in the toolbar.
The following dialog box will appear:
.. image:: ../images/add_node_on_segment-dlg.png
:align: center
#. Enter IDs of nodes forming the edge in the **Edge** field (the node IDs must be separated by a dash) or select the edge in the 3D viewer.
#. Enter location of a new node on the edge which is defined as a real number in the range between 0.0 and 1.0. You can define it
* by clicking with your mouse on the edge in the Viewer,
* by typing a number in a field,
* by setting a number using arrows of a spin box.
#. Activate **Preview** to see a result of the operation.
#. Click the **Apply** or **Apply and Close** button to confirm the operation.
**See Also** a sample TUI Script of a :ref:`tui_cutting_triangles` operation.