

.. _sphx_glr_gallery_mplot3d_tricontourf3d.py:


=================================
Triangular 3D filled contour plot
=================================

Filled contour plots of unstructured triangular grids.

The data used is the same as in the second plot of trisurf3d_demo2.
tricontour3d_demo shows the unfilled version of this example.




.. image:: /gallery/mplot3d/images/sphx_glr_tricontourf3d_001.png
    :align: center





.. code-block:: python


    import matplotlib.pyplot as plt
    from mpl_toolkits.mplot3d import Axes3D
    import matplotlib.tri as tri
    import numpy as np

    # First create the x, y, z coordinates of the points.
    n_angles = 48
    n_radii = 8
    min_radius = 0.25

    # Create the mesh in polar coordinates and compute x, y, z.
    radii = np.linspace(min_radius, 0.95, n_radii)
    angles = np.linspace(0, 2*np.pi, n_angles, endpoint=False)
    angles = np.repeat(angles[..., np.newaxis], n_radii, axis=1)
    angles[:, 1::2] += np.pi/n_angles

    x = (radii*np.cos(angles)).flatten()
    y = (radii*np.sin(angles)).flatten()
    z = (np.cos(radii)*np.cos(angles*3.0)).flatten()

    # Create a custom triangulation.
    triang = tri.Triangulation(x, y)

    # Mask off unwanted triangles.
    xmid = x[triang.triangles].mean(axis=1)
    ymid = y[triang.triangles].mean(axis=1)
    mask = np.where(xmid*xmid + ymid*ymid < min_radius*min_radius, 1, 0)
    triang.set_mask(mask)

    fig = plt.figure()
    ax = fig.gca(projection='3d')
    ax.tricontourf(triang, z, cmap=plt.cm.CMRmap)

    # Customize the view angle so it's easier to understand the plot.
    ax.view_init(elev=45.)

    plt.show()

**Total running time of the script:** ( 0 minutes  0.029 seconds)



.. container:: sphx-glr-footer


  .. container:: sphx-glr-download

     :download:`Download Python source code: tricontourf3d.py <tricontourf3d.py>`



  .. container:: sphx-glr-download

     :download:`Download Jupyter notebook: tricontourf3d.ipynb <tricontourf3d.ipynb>`

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

    `Generated by Sphinx-Gallery <https://sphinx-gallery.readthedocs.io>`_
