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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

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<h1>frontpage example code: plot_3D.py<a class="headerlink" href="#frontpage-example-code-plot-3d-py" title="Permalink to this headline">¶</a></h1>

[<a class="reference external" href="plot_3D.py">source code</a>]

<div class="highlight-default"><div class="highlight"><pre>"""

====================

Frontpage 3D example

====================

This example reproduces the frontpage 3D example.

"""

from mpl_toolkits.mplot3d import Axes3D

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

</pre></div>

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