import matplotlib as mpl
import matplotlib.pyplot
import mpl_toolkits as mplt
import mpl_toolkits.mplot3d.axes3d
fig = mpl.pyplot.figure() # make Figure
ax = mpl.pyplot.gca(projection="3d")
circle1 = mpl.patches.Circle((5,1))
circle2 = mpl.patches.Circle((2,2))

# test 1 (throws ValueError):
#pc1 = matplotlib.collections.PatchCollection([circle1, circle2])
#ax.add_collection3d(pc1, zs=[1,2])

# test 2:
pc2 = mplt.mplot3d.art3d.Patch3DCollection([circle1, circle2], match_original=True)
ax.add_collection3d(pc2)

Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/matplotlib/backends/backend_qt5.py", line 519, in _draw_idle
    self.draw()
  File "/usr/lib/python3.6/site-packages/matplotlib/backends/backend_agg.py", line 402, in draw
    self.figure.draw(self.renderer)
  File "/usr/lib/python3.6/site-packages/matplotlib/artist.py", line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/python3.6/site-packages/matplotlib/figure.py", line 1649, in draw
    renderer, self, artists, self.suppressComposite)
  File "/usr/lib/python3.6/site-packages/matplotlib/image.py", line 138, in _draw_list_compositing_images
    a.draw(renderer)
  File "/usr/lib/python3.6/site-packages/matplotlib/artist.py", line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/python3.6/site-packages/mpl_toolkits/mplot3d/axes3d.py", line 287, in draw
    reverse=True)):
  File "/usr/lib/python3.6/site-packages/mpl_toolkits/mplot3d/axes3d.py", line 286, in <lambda>
    key=lambda col: col.do_3d_projection(renderer),
  File "/usr/lib/python3.6/site-packages/mpl_toolkits/mplot3d/art3d.py", line 400, in do_3d_projection
    fcs = (zalpha(self._facecolor3d, vzs) if self._depthshade else
  File "/usr/lib/python3.6/site-packages/mpl_toolkits/mplot3d/art3d.py", line 776, in zalpha
    colors = get_colors(colors, len(zs))
  File "/usr/lib/python3.6/site-packages/mpl_toolkits/mplot3d/art3d.py", line 767, in get_colors
    (num, 4))
  File "/usr/lib/python3.6/site-packages/numpy/lib/stride_tricks.py", line 176, in broadcast_to
    return _broadcast_to(array, shape, subok=subok, readonly=True)
  File "/usr/lib/python3.6/site-packages/numpy/lib/stride_tricks.py", line 128, in _broadcast_to
    op_flags=[op_flag], itershape=shape, order='C')
ValueError: operands could not be broadcast together with remapped shapes [original->remapped]: (2,4) and requested shape (1,4)
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/matplotlib/backends/backend_qt5.py", line 519, in _draw_idle
    self.draw()
  File "/usr/lib/python3.6/site-packages/matplotlib/backends/backend_agg.py", line 402, in draw
    self.figure.draw(self.renderer)
  File "/usr/lib/python3.6/site-packages/matplotlib/artist.py", line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/python3.6/site-packages/matplotlib/figure.py", line 1649, in draw
    renderer, self, artists, self.suppressComposite)
  File "/usr/lib/python3.6/site-packages/matplotlib/image.py", line 138, in _draw_list_compositing_images
    a.draw(renderer)
  File "/usr/lib/python3.6/site-packages/matplotlib/artist.py", line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/python3.6/site-packages/mpl_toolkits/mplot3d/axes3d.py", line 287, in draw
    reverse=True)):
  File "/usr/lib/python3.6/site-packages/mpl_toolkits/mplot3d/axes3d.py", line 286, in <lambda>
    key=lambda col: col.do_3d_projection(renderer),
  File "/usr/lib/python3.6/site-packages/mpl_toolkits/mplot3d/art3d.py", line 400, in do_3d_projection
    fcs = (zalpha(self._facecolor3d, vzs) if self._depthshade else
  File "/usr/lib/python3.6/site-packages/mpl_toolkits/mplot3d/art3d.py", line 776, in zalpha
    colors = get_colors(colors, len(zs))
  File "/usr/lib/python3.6/site-packages/mpl_toolkits/mplot3d/art3d.py", line 767, in get_colors
    (num, 4))
  File "/usr/lib/python3.6/site-packages/numpy/lib/stride_tricks.py", line 176, in broadcast_to
    return _broadcast_to(array, shape, subok=subok, readonly=True)
  File "/usr/lib/python3.6/site-packages/numpy/lib/stride_tricks.py", line 128, in _broadcast_to
    op_flags=[op_flag], itershape=shape, order='C')
ValueError: operands could not be broadcast together with remapped shapes [original->remapped]: (2,4) and requested shape (1,4)
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/matplotlib/backends/backend_qt5.py", line 519, in _draw_idle
    self.draw()
  File "/usr/lib/python3.6/site-packages/matplotlib/backends/backend_agg.py", line 402, in draw
    self.figure.draw(self.renderer)
  File "/usr/lib/python3.6/site-packages/matplotlib/artist.py", line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/python3.6/site-packages/matplotlib/figure.py", line 1649, in draw
    renderer, self, artists, self.suppressComposite)
  File "/usr/lib/python3.6/site-packages/matplotlib/image.py", line 138, in _draw_list_compositing_images
    a.draw(renderer)
  File "/usr/lib/python3.6/site-packages/matplotlib/artist.py", line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/python3.6/site-packages/mpl_toolkits/mplot3d/axes3d.py", line 287, in draw
    reverse=True)):
  File "/usr/lib/python3.6/site-packages/mpl_toolkits/mplot3d/axes3d.py", line 286, in <lambda>
    key=lambda col: col.do_3d_projection(renderer),
  File "/usr/lib/python3.6/site-packages/mpl_toolkits/mplot3d/art3d.py", line 400, in do_3d_projection
    fcs = (zalpha(self._facecolor3d, vzs) if self._depthshade else
  File "/usr/lib/python3.6/site-packages/mpl_toolkits/mplot3d/art3d.py", line 776, in zalpha
    colors = get_colors(colors, len(zs))
  File "/usr/lib/python3.6/site-packages/mpl_toolkits/mplot3d/art3d.py", line 767, in get_colors
    (num, 4))
  File "/usr/lib/python3.6/site-packages/numpy/lib/stride_tricks.py", line 176, in broadcast_to
    return _broadcast_to(array, shape, subok=subok, readonly=True)
  File "/usr/lib/python3.6/site-packages/numpy/lib/stride_tricks.py", line 128, in _broadcast_to
    op_flags=[op_flag], itershape=shape, order='C')
ValueError: operands could not be broadcast together with remapped shapes [original->remapped]: (2,4) and requested shape (1,4)