.. _tui_modifying_meshes_page: 

****************
Modifying Meshes
****************

.. contents:: `Table of contents`


.. _tui_adding_nodes_and_elements: 

Adding Nodes and Elements
=========================

.. _tui_add_node:

Add Node
********

.. literalinclude:: ../../examples/modifying_meshes_ex01.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex01.py>`

.. _tui_add_0DElement:

Add 0D Element
**************

.. literalinclude:: ../../examples/modifying_meshes_ex02.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex02.py>`

.. _tui_add_0DElement_on_all_nodes:

Add 0D Element on Element Nodes
*******************************

.. literalinclude:: ../../examples/modifying_meshes_ex03.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex03.py>`

.. _tui_add_edge:

Add Edge
********

.. literalinclude:: ../../examples/modifying_meshes_ex04.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex04.py>`

.. _tui_add_triangle:

Add Triangle
************

.. literalinclude:: ../../examples/modifying_meshes_ex05.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex05.py>`

.. _tui_add_quadrangle:

Add Quadrangle
**************

.. literalinclude:: ../../examples/modifying_meshes_ex06.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex06.py>`

.. _tui_add_tetrahedron:

Add Tetrahedron
***************

.. literalinclude:: ../../examples/modifying_meshes_ex07.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex07.py>`

.. _tui_add_hexahedron:

Add Hexahedron
**************

.. literalinclude:: ../../examples/modifying_meshes_ex08.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex08.py>`

.. _tui_add_polygon:

Add Polygon
***********

.. literalinclude:: ../../examples/modifying_meshes_ex09.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex09.py>`

.. _tui_add_polyhedron:

Add Polyhedron
**************

.. literalinclude:: ../../examples/modifying_meshes_ex10.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex10.py>`

.. _tui_removing_nodes_and_elements: 

Removing Nodes and Elements
===========================

.. _tui_removing_nodes:

Removing Nodes
**************

.. literalinclude:: ../../examples/modifying_meshes_ex11.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex11.py>`

.. _tui_removing_elements:

Removing Elements
*****************

.. literalinclude:: ../../examples/modifying_meshes_ex12.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex12.py>`

.. _tui_removing_orphan_nodes:

Removing Orphan Nodes
*********************

.. literalinclude:: ../../examples/modifying_meshes_ex13.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex13.py>`

.. _tui_moving_nodes: 

Moving Nodes
============

.. literalinclude:: ../../examples/modifying_meshes_ex15.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex15.py>`

.. _tui_diagonal_inversion: 

Diagonal Inversion
==================

.. literalinclude:: ../../examples/modifying_meshes_ex16.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex16.py>`

.. _tui_uniting_two_triangles:

Uniting two Triangles
=====================

.. literalinclude:: ../../examples/modifying_meshes_ex17.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex17.py>`

.. _tui_uniting_set_of_triangles:

Uniting a Set of Triangles
==========================

.. literalinclude:: ../../examples/modifying_meshes_ex18.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex18.py>`

.. _tui_orientation: 

Orientation
===========

.. literalinclude:: ../../examples/modifying_meshes_ex19.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex19.py>`

.. _tui_cutting_quadrangles: 

Cutting Quadrangles
===================

.. literalinclude:: ../../examples/modifying_meshes_ex20.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex20.py>`

.. _tui_cutting_triangles: 

Cutting Triangles
=================

.. literalinclude:: ../../examples/modifying_meshes_cut_triangles.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_cut_triangles.py>`

.. _modifying_meshes_split_vol: 

Split Volumes into Tetrahedra
=============================

.. literalinclude:: ../../examples/modifying_meshes_split_vol.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_split_vol.py>`

.. _tui_smoothing: 

Smoothing
=========

.. literalinclude:: ../../examples/modifying_meshes_ex21.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex21.py>`

.. _tui_extrusion: 

Extrusion
=========

.. literalinclude:: ../../examples/modifying_meshes_ex22.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex22.py>`

.. _tui_extrusion_along_path: 

Extrusion along a Path
======================

.. literalinclude:: ../../examples/modifying_meshes_ex23.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex23.py>`

.. _tui_revolution: 

Revolution
==========

.. literalinclude:: ../../examples/modifying_meshes_ex24.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex24.py>`

.. _tui_pattern_mapping: 

Pattern Mapping
===============

.. literalinclude:: ../../examples/modifying_meshes_ex25.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex25.py>`

.. _tui_quadratic: 

Convert mesh to/from quadratic
==============================

.. literalinclude:: ../../examples/modifying_meshes_ex26.py
    :language: python

:download:`Download this script <../../examples/modifying_meshes_ex26.py>`

.. _tui_split_biquad: 

Split bi-quadratic into linear
==============================

.. literalinclude:: ../../examples/split_biquad.py
    :language: python

:download:`Download this script <../../examples/split_biquad.py>`

.. _tui_double_nodes_on_group_boundaries:

Double nodes on groups boundaries
=================================

Double nodes on shared faces between groups of volumes and create flat elements on demand.

The list of groups must contain at least two groups. The groups have to be disjoint: no common element into two different groups.

The nodes of the internal faces at the boundaries of the groups are doubled. Optionally, the internal faces are replaced by flat elements.

Triangles are transformed into prisms, and quadrangles into hexahedrons.

The flat elements are stored in groups of volumes.

These groups are named according to the position of the group in the list:
the group j_n_p is the group of the flat elements that are built between the group \#n and the group \#p in the list.
If there is no shared faces between the group \#n and the group \#p in the list, the group j_n_p is not created.
All the flat elements are gathered into the group named "joints3D" (or "joints2D" in 2D situation).
The flat element of the multiple junctions between the simple junction are stored in a group named "jointsMultiples".

This example represents an iron cable (a thin cylinder) in a concrete block (a big cylinder).
The big cylinder is defined by two geometric volumes.

.. literalinclude:: ../../examples/generate_flat_elements.py
    :language: python

:download:`Download this script <../../examples/generate_flat_elements.py>`

Here, the 4 groups of volumes [Solid_1_1, Solid_2_1, Solid_3_1, Solid_4_1] constitute a partition of the mesh.
The flat elements on group boundaries and on faces are built with the
2 last lines of the code above.

If the last argument (Boolean) in DoubleNodesOnGroupBoundaries is set to 1,
the flat elements are built, otherwise, there is only a duplication of the nodes.

To observe flat element groups, save the resulting mesh on a MED file and reload it.


