Bug report

Bug summary

The marker sizes that specified withs= argument inscatter function are wrong, and even worse, the markers are changing their sizes every time the plot is re-rendered (panning or resizing). It seems that the sizes are randomly reassigned to these markers.

Code for reproduction

importnumpyasnpimportmatplotlib.pyplotaspltfrommpl_toolkits.mplot3dimportAxes3Dfig=plt.figure()# matplotlib 3.4ax=Axes3D(fig,auto_add_to_figure=False)fig.add_axes(ax)# matplotlib 3.3.4# Axes3D(fig)x=np.random.rand(200)y=np.random.rand(200)z=np.random.rand(200)ax.scatter(x,y,z,s=x*50)plt.show()

Actual outcome

Expected outcome

As shown in the screen recording, the sizes are correct and not changing.matplotlib was 3.3.4 in the following example.

Matplotlib version

• Operating system: Arch Linux
• Matplotlib version (import matplotlib; print(matplotlib.__version__)): 3.4.0
• Matplotlib backend (print(matplotlib.get_backend())): Qt5Agg
• Python version: 3.9.2
• Jupyter version (if applicable): Not using it
• Other libraries: numpy 1.20.1

I installed both python, numpy and matplotlib withpacman package manager from Arch's official repository.