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

.. only:: html

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

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

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

.. _sphx_glr_examples_simplify.py:


Compare Decimation Methods
--------------------------

This example compares various decimation methods

.. GENERATED FROM PYTHON SOURCE LINES 8-27

.. code-block:: Python


    import time

    import pyvista as pv
    from pyvista import examples

    import fast_simplification

    # load an example mesh
    mesh = examples.download_louis_louvre()

    # nice camera angle
    cpos = [
        (6.264157141857314, -6.959267635766402, 11.71668951132694),
        (1.3291685457683413, 2.267162128740896, 12.263240938610595),
        (0.0023825740958850136, -0.05786378450796799, 0.9983216444528751),
    ]









.. GENERATED FROM PYTHON SOURCE LINES 28-29

Compare decimation times

.. GENERATED FROM PYTHON SOURCE LINES 29-73

.. code-block:: Python

    reduction = 0.9
    print("Approach                         Time Elapsed")

    tstart = time.time()
    fas_sim = fast_simplification.simplify_mesh(mesh, target_reduction=reduction)
    fast_sim_time = time.time() - tstart
    print(f"Fast Quadratic Simplification  {fast_sim_time:8.4f} seconds")

    tstart = time.time()
    dec_std = mesh.decimate(reduction)
    dec_std_time = time.time() - tstart
    print(f"vtkQuadricDecimation           {dec_std_time:8.4f} seconds")

    tstart = time.time()
    dec_pro = mesh.decimate_pro(reduction)
    dec_pro_time = time.time() - tstart
    print(f"vtkDecimatePro                 {dec_pro_time:8.4f} seconds")


    pl = pv.Plotter(shape=(2, 2), window_size=(1000, 1000), theme=pv.themes.DocumentTheme())
    pl.add_text("Original", "upper_right", color="k")
    pl.add_mesh(mesh, show_edges=True)
    pl.camera_position = cpos

    pl.subplot(0, 1)
    pl.add_text(
        f"Fast-Quadric-Mesh-Simplification\n{fast_sim_time:8.4f} seconds",
        "upper_right",
        color="k",
    )
    pl.add_mesh(fas_sim, show_edges=True)
    pl.camera_position = cpos

    pl.subplot(1, 0)
    pl.add_mesh(dec_std, show_edges=True)
    pl.add_text(f"vtkQuadricDecimation\n{dec_std_time:8.4f} seconds", "upper_right", color="k")
    pl.camera_position = cpos

    pl.subplot(1, 1)
    pl.add_mesh(dec_pro, show_edges=True)
    pl.add_text(f"vtkDecimatePro\n{dec_pro_time:8.4f} seconds", "upper_right", color="k")
    pl.camera_position = cpos

    pl.show()



.. image-sg:: /examples/images/sphx_glr_simplify_001.png
   :alt: simplify
   :srcset: /examples/images/sphx_glr_simplify_001.png
   :class: sphx-glr-single-img


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

 .. code-block:: none

    Approach                         Time Elapsed
    Fast Quadratic Simplification    0.5010 seconds
    vtkQuadricDecimation             2.4565 seconds
    vtkDecimatePro                   1.9173 seconds





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

   **Total running time of the script:** (0 minutes 6.140 seconds)


.. _sphx_glr_download_examples_simplify.py:

.. only:: html

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

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

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

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

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

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

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


.. only:: html

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

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