.. note:: :class: sphx-glr-download-link-note Click :ref:`here ` to download the full example code .. rst-class:: sphx-glr-example-title .. _sphx_glr_gallery_mplot3d_voxels_torus.py: ======================================================= 3D voxel / volumetric plot with cylindrical coordinates ======================================================= Demonstrates using the *x*, *y*, *z* arguments of `.Axes3D.voxels`. .. image:: /gallery/mplot3d/images/sphx_glr_voxels_torus_001.png :class: sphx-glr-single-img .. code-block:: default import matplotlib.pyplot as plt import matplotlib.colors import numpy as np def midpoints(x): sl = () for i in range(x.ndim): x = (x[sl + np.index_exp[:-1]] + x[sl + np.index_exp[1:]]) / 2.0 sl += np.index_exp[:] return x # prepare some coordinates, and attach rgb values to each r, theta, z = np.mgrid[0:1:11j, 0:np.pi*2:25j, -0.5:0.5:11j] x = r*np.cos(theta) y = r*np.sin(theta) rc, thetac, zc = midpoints(r), midpoints(theta), midpoints(z) # define a wobbly torus about [0.7, *, 0] sphere = (rc - 0.7)**2 + (zc + 0.2*np.cos(thetac*2))**2 < 0.2**2 # combine the color components hsv = np.zeros(sphere.shape + (3,)) hsv[..., 0] = thetac / (np.pi*2) hsv[..., 1] = rc hsv[..., 2] = zc + 0.5 colors = matplotlib.colors.hsv_to_rgb(hsv) # and plot everything fig = plt.figure() ax = fig.gca(projection='3d') ax.voxels(x, y, z, sphere, facecolors=colors, edgecolors=np.clip(2*colors - 0.5, 0, 1), # brighter linewidth=0.5) plt.show() .. _sphx_glr_download_gallery_mplot3d_voxels_torus.py: .. only :: html .. container:: sphx-glr-footer :class: sphx-glr-footer-example .. container:: sphx-glr-download :download:`Download Python source code: voxels_torus.py ` .. container:: sphx-glr-download :download:`Download Jupyter notebook: voxels_torus.ipynb ` .. only:: html .. rst-class:: sphx-glr-signature Keywords: matplotlib code example, codex, python plot, pyplot `Gallery generated by Sphinx-Gallery `_