from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt
import numpy  as np
x = np.arange(0,1000,1)
y = np.arange(0,1000,1)
X,Y = np.meshgrid(x,y)
Z1 = (X+Y)/2
Z2 = np.sqrt(X*Y)
fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
ax.plot_wireframe(X,Y,Z1,color="red")
ax.plot_wireframe(X,Y,Z2,color="blue")
plt.show()