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POdrawing a line on a 3D plot in matplotlib
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  1. POdrawing a line on a 3D plot in matplotlib
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    copied!<p>I have a 3D plot which looks quite similar to <a href="https://stackoverflow.com/questions/10917495/matplotlib-imshow-in-3d-plot">this one</a> , but I want to add two lines drawn on the bottom contour plot. I would like the two lines to cross at and point to a particular (x,y) value.</p> <p>I can draw a line there but it is always beneath the contour plot, despite my numerous attempts. Can anyone help me drawing the line <em>on</em> the contour plot? I am pasting my code below. The line is visible only in the part where it sticks out from the contour.</p> <pre><code>#!/usr/bin/env python import sys, re, math import matplotlib.pyplot as plt from mpl_toolkits.mplot3d import Axes3D from matplotlib.collections import LineCollection from matplotlib import cm from matplotlib.mlab import griddata import numpy as np x = [] y = [] z = [] for i in range(0,628,10) : for j in range(0,628,10) : x.append(i*0.01) y.append(j*0.01) z.append(math.sin(x[-1]*y[-1])*20) fig = plt.figure() ax = fig.gca(projection='3d') xi = np.linspace(min(x), max(x)) yi = np.linspace(min(y), max(y)) X, Y = np.meshgrid(xi, yi) Z = griddata(x, y, z, xi, yi) ax.autoscale(False) ax.view_init(elev=30, azim=-140) surf = ax.plot_surface(X, Y, Z, rstride=1, cstride=1, cmap=cm.cool, linewidth=0.1, antialiased=True, shade=True,alpha=0.8) cset = ax.contourf(X, Y, Z, zdir='z', offset=-100, cmap=cm.cool, cstride=1, linewidth=0.1, antialiased=True, shade=True) ax.set_xlim3d(0, math.pi*2) ax.set_ylim3d(0, math.pi*2) ax.set_zlim3d(-100, 20) xi = [0,6] yi = [3,3] l=zip(xi,yi) lines = LineCollection((l,l),zorder=10000,color='k') ax.add_collection3d(lines,zs=-90) plt.show() </code></pre>
 

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