演示在3D中绘制轮廓（水平）曲线

这就像二维的等高线图，除了 f(x, y)=c 在平面上绘制曲线 z=c .

from mpl_toolkits.mplot3d import axes3d
import matplotlib.pyplot as plt
from matplotlib import cm

fig = plt.figure()
ax = fig.gca(projection='3d')
X, Y, Z = axes3d.get_test_data(0.05)

# Plot contour curves
cset = ax.contour(X, Y, Z, cmap=cm.coolwarm)

ax.clabel(cset, fontsize=9, inline=True)

plt.show()