ax.fill_between如何在3d图中绘制

要在3D图中绘制ax.fill_between，需要使用mpl_toolkits.mplot3d.art3d.Poly3DCollection类。具体步骤如下：

1.导入必要的库：

import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d.art3d import Poly3DCollection

2.创建3D图：

fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')

3.创建x、y、z的值：

x = [1, 2, 3, 4, 5]
y = [1, 2, 3, 4, 5]
z1 = [0, 1, 0, 1, 0]
z2 = [1, 0, 1, 0, 1]

4.使用ax.fill_between绘制填充区域：

verts = [(x[i], y[i], z1[i]) for i in range(len(x))] + [(x[i], y[i], z2[i]) for i in range(len(x)-1,-1,-1)]
poly = Poly3DCollection([verts], alpha=.25, facecolor='red', edgecolor='black')
ax.add_collection3d(poly)

完整代码如下：

import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d.art3d import Poly3DCollection

fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')

x = [1, 2, 3, 4, 5]
y = [1, 2, 3, 4, 5]
z1 = [0, 1, 0, 1, 0]
z2 = [1, 0, 1, 0, 1]

verts = [(x[i], y[i], z1[i]) for i in range(len(x))] + [(x[i], y[i], z2[i]) for i in range(len(x)-1,-1,-1)]
poly = Poly3DCollection([verts], alpha=.25, facecolor='red', edgecolor='black')
ax.add_collection3d(poly)

plt.show()

这样，就可以在3D图中绘制填充区域了。