How to draw rectangles in pyplot?

[scidam]

You need to be sure about points that forms a rectangle. Look at the simplest example below:

from mpl_toolkits.mplot3d import Axes3D                                                                                                                                                                                                                                                                                     
import numpy as np                                                                                                                                                                                                                                                                                                          
                                                                                                                                                                                                                                                                                                                            
from mpl_toolkits.mplot3d import Axes3D                                                                                                                                                                                                                                                                                     
from mpl_toolkits.mplot3d.art3d import Poly3DCollection                                                                                                                                                                                                                                                                     
import matplotlib.pyplot as plt                                                                                                                                                                                                                                                                                             
                                                                                                                                                                                                                                                                                                                            
                                                                                                                                                                                                                                                                                                                            
fig = plt.figure()                                                                                                                                                                                                                                                                                                          
ax = fig.add_subplot(111, projection='3d')                                                                                                                                                                                                                                                                                  
                                                                                                                                                                                                                                                                                                                            
rects  = [[[0, 0, 0], [0, 0, 1], [0, 1, 1], [0, 1, 0 ], [0, 0, 0]]]                                                                                                                                                                                                                                                               
# Each rectangle is presented as a set of points
# array rects consist of rectangles
                                                                                                                                                                                                                                                                                                                            
ax.add_collection3d(Poly3DCollection(rects))                                                                                                                                                                                                                                                                                
                                                                                                                                                                                                                                                                                                                            
vv = np.array(rects)                                                                                                                                                                                                                                                                                                        
ax.scatter(vv[0][:, 0], vv[0][:, 1], vv[0][:, 2], color='r')
plt.show()