Animate the midpoints of a 3d “Rhombic dodecahedron”

[Beck_Johnson]

I need help in animating a Rhombic dodecahedron. I want to enlarge and to shrink the midpoints (center points) with FuncAnimation from Matplotlib. I wanted to use the δ for this (make smaller/bigger) and for this an animation. But just don't know how. I successfully created a 3d Rhombic dodecahedron but now I'm stuck... .

This is the code:

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%matplotlib notebook fig = plt.figure() ax = Axes3D(fig) δ = symbols('δ') δ = 0.3   points = [     (0.5, 0.5, 0.5),     (0.5, 0.5, -0.5),     (0.5, -0.5, 0.5),     (0.5, -0.5, -0.5),     (-0.5, 0.5, 0.5),     (-0.5, 0.5, -0.5),     (-0.5, -0.5, 0.5),     (-0.5, -0.5, -0.5),     (0, 0,(0.5 + δ)),     (0, 0, -(0.5 + δ)),     (0,(0.5 + δ), 0),     (0, -(0.5 + δ), 0),     ((0.5 + δ), 0, 0),     (-(0.5 + δ), 0, 0) ]   surfaces = [     [points[0], points[1], points[12]], #front     [points[1], points[3], points[12]],     [points[3], points[2], points[12]],     [points[2], points[0], points[12]],           [points[6], points[4], points[13]], #behind     [points[4], points[5], points[13]],     [points[5], points[7], points[13]],     [points[7], points[6], points[13]],           [points[6], points[4], points[8]], #top     [points[4], points[0], points[8]],     [points[0], points[2], points[8]],     [points[2], points[6], points[8]],           [points[3], points[1], points[9]], #below     [points[1], points[5], points[9]],     [points[5], points[7], points[9]],     [points[7], points[3], points[9]],           [points[0], points[4], points[10]], #right     [points[4], points[5], points[10]],     [points[5], points[1], points[10]],     [points[1], points[0], points[10]],           [points[2], points[6], points[11]], #left     [points[6], points[7], points[11]],     [points[7], points[3], points[11]],     [points[3], points[2], points[11]] ]   ax.set_xlim3d(-1,1) ax.set_ylim3d(-1,1) ax.set_zlim3d(-1,1)   ax.add_collection3d(Poly3DCollection(surfaces, edgecolors = "k"))   fig.show()

I tried to animate it with older code which I used to animate a 2d graph but I couldn't really figure it out because I'm new to this stuff.

This is the old 2d animation code for the graph which I tried to reuse with some adjustments:

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fig, ax = plt.subplots()  xdata, ydata = [], []  ln, = plt.plot([], [], '-')   xdata = np.linspace(1, 5, 2000)      def afunc(frame):     result = []      for i in xdata:          result.append(np.sin(3*i+frame))      return result      def init():      ax.set_xlim(1, 5)      ax.set_ylim(-1, 1)     ax.spines['left'].set_position('center')     ax.spines['bottom'].set_position('center')     ax.spines['right'].set_color('none')     ax.spines['top'].set_color('none')     return ln      def update(frame):      ydata = afunc(frame)      ln.set_data(xdata, ydata)      return ln      step = 100 frames = np.arange(0, 1001, step)     ani = FuncAnimation(fig, update, frames,init_func=init, interval=30)   plt.show()

The imports are:

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from mpmath import * from sympy import * from sympy.interactive import printing import matplotlib.pyplot as plt import numpy as np from matplotlib.animation import FuncAnimation from sympy.plotting import plot3d from mpl_toolkits.mplot3d import Axes3D from mpl_toolkits.mplot3d.art3d import Poly3DCollection

Could someone help with code examples/working 3d animations for the midpoints of the 3d "Rhombic dodecahedron"? I'm stuck for some hours now... .

(I tried to reuse the old code for a 2d graph animation, then I tried some adjustments to it to make it 3d and fitting for the "Rhombic dodecahedron" but I couldn't really get it to work at all. English is not my native language and I'm beginner with python so it would be nice if you could be considerate about it.)