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

    Click :ref:`here <sphx_glr_download_gallery_frontpage_3D.py>` to download the full example code
.. rst-class:: sphx-glr-example-title

.. _sphx_glr_gallery_frontpage_3D.py:


====================
Frontpage 3D example
====================

This example reproduces the frontpage 3D example.





.. image:: /gallery/frontpage/images/sphx_glr_3D_001.png
    :class: sphx-glr-single-img





.. code-block:: python

    # This import registers the 3D projection, but is otherwise unused.
    from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import

    from matplotlib import cbook
    from matplotlib import cm
    from matplotlib.colors import LightSource
    import matplotlib.pyplot as plt
    import numpy as np

    filename = cbook.get_sample_data('jacksboro_fault_dem.npz', asfileobj=False)
    with np.load(filename) as dem:
        z = dem['elevation']
        nrows, ncols = z.shape
        x = np.linspace(dem['xmin'], dem['xmax'], ncols)
        y = np.linspace(dem['ymin'], dem['ymax'], nrows)
        x, y = np.meshgrid(x, y)

    region = np.s_[5:50, 5:50]
    x, y, z = x[region], y[region], z[region]

    fig, ax = plt.subplots(subplot_kw=dict(projection='3d'))

    ls = LightSource(270, 45)
    # To use a custom hillshading mode, override the built-in shading and pass
    # in the rgb colors of the shaded surface calculated from "shade".
    rgb = ls.shade(z, cmap=cm.gist_earth, vert_exag=0.1, blend_mode='soft')
    surf = ax.plot_surface(x, y, z, rstride=1, cstride=1, facecolors=rgb,
                           linewidth=0, antialiased=False, shade=False)
    ax.set_xticks([])
    ax.set_yticks([])
    ax.set_zticks([])
    fig.savefig("surface3d_frontpage.png", dpi=25)  # results in 160x120 px image


.. _sphx_glr_download_gallery_frontpage_3D.py:


.. only :: html

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



  .. container:: sphx-glr-download

     :download:`Download Python source code: 3D.py <3D.py>`



  .. container:: sphx-glr-download

     :download:`Download Jupyter notebook: 3D.ipynb <3D.ipynb>`


.. only:: html

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

    Keywords: matplotlib code example, codex, python plot, pyplot
    `Gallery generated by Sphinx-Gallery
    <https://sphinx-gallery.readthedocs.io>`_
