怎样设置包围盒，使其能比较好的包围住一个不平行于坐标轴的正方体

怎样设置包围盒，使其能比较好的包围住一个不平行于坐标轴的正方体

from mpl_toolkits.mplot3d import Axes3D 
import matplotlib.pyplot as plt 
import numpy as np 
from itertools import product, combinations 
import time 
import math 

fig = plt.figure() 
ax = fig.gca(projection='3d') 
ax.set_aspect("equal") 
start = time.time() 
# draw cube 
r = [-1, 1] 
for s, e in combinations(np.array(list(product(r, r, r))), 2): 
if np.sum(np.abs(s-e)) == r[1]-r[0]: 
ax.plot3D(*zip(s, e), color="b") 
print('spend_time:', time.time() - start) 
# draw sphere 
#u, v = np.mgrid[0:2*np.pi:20j, 0:np.pi:10j] 
#x = np.cos(u)*np.sin(v) 
#y = np.sin(u)*np.sin(v) 
#z = np.cos(v) 
#ax.plot_wireframe(x, y, z, color="r") 
# draw a point 
#ax.scatter([0], [0], [0], color="g", s=100) 
# draw a vector 
#from matplotlib.patches import FancyArrowPatch #from mpl_toolkits.mplot3d import proj3d 
# class Arrow3D(FancyArrowPatch): 
# def __init__(self, xs, ys, zs, *args, **kwargs): 
# FancyArrowPatch.__init__(self, (0, 0), (0, 0), *args, **kwargs) 
# self._verts3d = xs, ys, zs 
# def draw(self, renderer): 
# xs3d, ys3d, zs3d = self._verts3d 
# xs, ys, zs = proj3d.proj_transform(xs3d, ys3d, zs3d, renderer.M) 
# self.set_positions((xs[0], ys[0]), (xs[1], ys[1])) 
# FancyArrowPatch.draw(self, renderer) 
# a = Arrow3D([0, 1], [0, 1], [0, 1], mutation_scale=20, 
# lw=1, arrowstyle="-|>", color="k") 
# ax.add_artist(a) 
plt.show()