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

.. only:: html

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

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

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

.. _sphx_glr_examples_cow.py:


Cow
~~~

Tetrahedralize a cow mesh.

.. GENERATED FROM PYTHON SOURCE LINES 7-13

.. code-block:: Python

    # sphinx_gallery_thumbnail_number = 3
    import numpy as np
    import pyvista as pv
    from pyvista import examples
    import tetgen








.. GENERATED FROM PYTHON SOURCE LINES 14-27

.. code-block:: Python


    cow_mesh = examples.download_cow().triangulate()

    cpos = [(13.0, 7.6, -13.85), (0.44, -0.4, -0.37), (-0.28, 0.9, 0.3)]

    cpos = [
        (15.87144235049248, 4.879216382405231, -12.14248864876951),
        (1.1623113035352375, -0.7609060338348953, 0.3192320579894903),
        (-0.19477922834083672, 0.9593375398915212, 0.20428542963665386),
    ]

    cow_mesh.plot(cpos=cpos)




.. image-sg:: /examples/images/sphx_glr_cow_001.png
   :alt: cow
   :srcset: /examples/images/sphx_glr_cow_001.png
   :class: sphx-glr-single-img





.. GENERATED FROM PYTHON SOURCE LINES 28-35

.. code-block:: Python


    tet = tetgen.TetGen(cow_mesh)
    tet.make_manifold()
    tet.tetrahedralize()

    cow_grid = tet.grid








.. GENERATED FROM PYTHON SOURCE LINES 36-41

.. code-block:: Python


    # plot half the cow
    mask = np.logical_or(cow_grid.points[:, 0] < 0, cow_grid.points[:, 0] > 4)
    half_cow = cow_grid.extract_points(mask)








.. GENERATED FROM PYTHON SOURCE LINES 42-49

.. code-block:: Python


    plotter = pv.Plotter()
    plotter.add_mesh(half_cow, color="w", show_edges=True)
    plotter.add_mesh(cow_grid, color="r", style="wireframe", opacity=0.2)
    plotter.camera_position = cpos
    plotter.show()




.. image-sg:: /examples/images/sphx_glr_cow_002.png
   :alt: cow
   :srcset: /examples/images/sphx_glr_cow_002.png
   :class: sphx-glr-single-img





.. GENERATED FROM PYTHON SOURCE LINES 50-51

Make animation of the mesh construction

.. GENERATED FROM PYTHON SOURCE LINES 51-69

.. code-block:: Python


    plotter = pv.Plotter(off_screen=True, window_size=[1000, 1000])
    plotter.open_gif("cow.gif")
    plotter.add_mesh(cow_grid, color="r", style="wireframe", opacity=0.2)
    plotter.camera_position = cpos
    plotter.write_frame()

    nframe = 36
    xb = np.array(cow_grid.bounds[0:2])
    step = xb.ptp() / nframe
    for val in np.arange(xb[0] + step, xb[1] + step, step):
        mask = np.argwhere(cow_grid.cell_centers().points[:, 0] < val)
        half_cow = cow_grid.extract_cells(mask)
        plotter.add_mesh(half_cow, color="w", show_edges=True, name="building")
        plotter.update()
        plotter.write_frame()

    plotter.close()



.. image-sg:: /examples/images/sphx_glr_cow_003.gif
   :alt: cow
   :srcset: /examples/images/sphx_glr_cow_003.gif
   :class: sphx-glr-single-img






.. rst-class:: sphx-glr-timing

   **Total running time of the script:** (0 minutes 15.278 seconds)


.. _sphx_glr_download_examples_cow.py:

.. only:: html

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

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

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

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

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


.. only:: html

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

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