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set_{x,y,z}bound 3d limits are not persistent upon interactive rotation #18112
Description
Bug report
Bug summary
3D axes limits set using set_{x,y,z}bound are dropped when interactively rotating 3d axes.
Code for reproduction
import matplotlib.pyplot as plt
ax = plt.figure().add_subplot(projection="3d")
ax.plot([0, 1], [0, 1], [0, 1])
ax.set(xbound=[-1, 1], ybound=[-1, 1], zbound=[-1, 1])
# ax.set(xlim=[-1, 1], ylim=[-1, 1], zlim=[-1, 1])
plt.show()then interactively rotate the axes with the mouse.
Actual outcome
The axes limits immediately snap back to [0, 1] (plus margins).
Expected outcome
Limits are respected (as with set_{x,y,z}lim).
Matplotlib version
- Operating system: linux
- Matplotlib version: master
- Matplotlib backend (
print(matplotlib.get_backend())): qt5agg - Python version: 38
- Jupyter version (if applicable):
- Other libraries:
Activity
timhoffm commentedon Jul 29, 2020
The reason is the following
set_x/y/zlim()deactivate autoscaling (auto=False).set_x/y/zbound()leave the autoscaling unchanged (callingset_xlim(auto=None)).This can be verified via
fixing the issue.
Questions:
*boundsand*limbehave differently concerning auto-scaling? But even if so, it may be hard to change, because I expect that would break a lot of user code.QuLogic commentedon Jul 30, 2020
It's not the mouse move that triggers it, it's the draw. If you insert
fig.canvas.draw()beforeplt.show(), the limits are [0, 1]. I don't know why this change during draw is not reflected in the plot.I think this may be because of the new lazy autoscaling. Nothing in mplot3d sets the new
ax._stale_viewlim_x, so_unstale_viewLimrescales.QuLogic commentedon Jul 30, 2020
This is a regression from 3.1.2; I will test some newer versions, but if it's lazy autoscaling, then it's a
3.33.2 regression. I think I've written most of a fix.Implement lazy autoscaling in mplot3d.
QuLogic commentedon Jul 31, 2020
And this is because
Axes3D.drawfirst calculates the world projection, then callssuper().draw(), andAxes.drawcallsself._unstale_viewLim. Putting that at the beginning ofAxes3D.drawmakes things stabler. This is similar to #17422 forPolarAxes.Implement lazy autoscaling in mplot3d.
Implement lazy autoscaling in mplot3d.
Implement lazy autoscaling in mplot3d.