.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "_examples/00_grids/plot_mesh_generation.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        :ref:`Go to the end <sphx_glr_download__examples_00_grids_plot_mesh_generation.py>`
        to download the full example code.

.. rst-class:: sphx-glr-example-title

.. _sphx_glr__examples_00_grids_plot_mesh_generation.py:


Creating meshes with the mesh_gen object
========================================

There is a new (2026) interface to  :py:mod:`cr_trig_create`,
:py:class:`crtomo.mesh_interface.CRTomoGMSHMeshGenerator`.

This example present various ways to use this generator class.

.. note::

    You can access the generator class in two ways: ``from
    crtomo.mesh_interface import CRTomoGMSHMeshGenerator`` or using the
    top-level module ``crtomo``: ``from crtomo import
    CRTomoGMSHMeshGenerator``. There is also an already initialized instance of
    the mesh loaded as ``crtomo.mesh_gen``. In most cases, this instance is the
    easiest way to use the generator.

.. GENERATED FROM PYTHON SOURCE LINES 23-24

The top level crtomo import suffices for most tasks

.. GENERATED FROM PYTHON SOURCE LINES 24-26

.. code-block:: Python

    import crtomo
    import numpy as np







.. GENERATED FROM PYTHON SOURCE LINES 27-33

Defining the mesh boundaries and electrode positions
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. note::

  Always work clockwise when denoting boundary nodes!


.. GENERATED FROM PYTHON SOURCE LINES 33-56

.. code-block:: Python


    # define the electrode positions
    electrodes = np.array((
        (0, 0),
        (1, 0),
        (2, 0),
        (3, 0),
    ))

    # define the boundary geometry
    # the last number indicates the type of boundary element towards the next node
    # 12: Neumann no-flow boundaries (for surface boundaries)
    # 11: mixed boundary types (subsurface boundaries)
    boundaries = np.array((
        (-1, 0, 12),
        (0, 0, 12),
        (1, 0, 12),
        (2, 0, 12),
        (3, 0, 12),
        (4, 0, 11),
        (4, -2, 11),
        (-1, -2, 11),
    ))







.. GENERATED FROM PYTHON SOURCE LINES 57-59

Mesh Generation
^^^^^^^^^^^^^^^

.. GENERATED FROM PYTHON SOURCE LINES 59-70

.. code-block:: Python

    mesh = crtomo.mesh_gen.gen_mesh(
        boundaries,
        electrodes,
        char_lengths=[
            0.5,
            0.45,
            0.45,
            0.45,
        ],
    )
    _ = mesh.plot()



.. image-sg:: /_examples/00_grids/images/sphx_glr_plot_mesh_generation_001.png
   :alt: plot mesh generation
   :srcset: /_examples/00_grids/images/sphx_glr_plot_mesh_generation_001.png
   :class: sphx-glr-single-img


.. rst-class:: sphx-glr-script-out

 .. code-block:: none

    Calling the mesh generation routines...
       done
    This grid was sorted using CutMcK. The nodes were resorted!
    Triangular grid found





.. _sphx_glr_download__examples_00_grids_plot_mesh_generation.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: plot_mesh_generation.ipynb <plot_mesh_generation.ipynb>`

    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: plot_mesh_generation.py <plot_mesh_generation.py>`

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: plot_mesh_generation.zip <plot_mesh_generation.zip>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_