python 3D散点绘图；

import matplotlib.pyplot as plt
import mpl_toolkits.mplot3d as p3d
import numpy as np

    fig = plt.figure()
    ax = p3d.Axes3D(fig)　　　　　　　　　　// 这一个非常关键；
    np.meshgrid()
    x = list(range(0, grayImg.shape[0]))
    y = list(range(0, grayImg.shape[1]))
    X, Y = np.meshgrid(x, y)　　　　　　　// X,Y;
    z = imgCornor.reshape(grayImg.shape[0] * grayImg.shape[1])
    ax.scatter(X, Y, z, c=‘b‘, s=10, alpha=0.05)
    plt.show()