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copied!<p>Because Axe3D will calculate the <code>zorder</code> attribute for every 3d object by 3d projection. To disable this you can create a <code>FixZorderCollection</code> class and change the 3d line's <code>__class__</code> attribute. Here is a full example:</p> <pre><code>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=1000,color='k',lw=3) ax.add_collection3d(lines,zs=-90) from mpl_toolkits.mplot3d.art3d import Line3DCollection class FixZorderCollection(Line3DCollection): _zorder = 1000 @property def zorder(self): return self._zorder @zorder.setter def zorder(self, value): pass ax.collections[-1].__class__ = FixZorderCollection plt.show() </code></pre> <p>output:</p> <p><img src="https://i.stack.imgur.com/M4FvK.png" alt="enter image description here"></p>

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