Bug summary

I had a code that uses animation.FuncAnimation to generate an animation, where I update a mpl_toolkits.mplot3d.art3d.Line3D object using set_data(a, b) and set_3d_properties(c) where a, b, and c are of type numpy.float64. This code works perfectly in Matplotlib 3.4.3. However, after I upgraded to Matplotlib 3.5.1, it fails with the following error

  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/mpl_toolkits/mplot3d/art3d.py", line 175, in set_3d_properties
    zs = np.broadcast_to(zs, len(xs))
TypeError: object of type 'numpy.float64' has no len()

Source

I checked the source code of mpl_toolkits/mplot3d/art3d.py and found that in Matplotlib 3.4.3, line 175 (the line where the error occurred) was zs = np.broadcast_to(zs, xs.shape) instead, and this avoids the error. I was able to make my code run again in Matplotlib 3.5.1 by changing my code to set_data([a], [b]) and set_3d_properties([c]), but as expected, this would not run in 3.4.3. I am using Python 3.10.

Was this change in line 175 of mpl_toolkits/mplot3d/art3d.py intended?