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Fix: Axis and grid panes out of sync when inverting an axis - #31992

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QuLogic merged 1 commit into
matplotlib:mainfrom
HakonSohoel:fix-inverted-3d-axis-placement
Jul 9, 2026
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Fix: Axis and grid panes out of sync when inverting an axis#31992
QuLogic merged 1 commit into
matplotlib:mainfrom
HakonSohoel:fix-inverted-3d-axis-placement

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@HakonSohoel

@HakonSohoel HakonSohoel commented Jul 3, 2026 •
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closes #31989

PR summary

When inverting an axis of a 3d plot the axis and background pane got out of sync.
This is a regression from previous versions.

This PR fixes the bug and adds a regression test for it.

Example

import matplotlib.pyplot as plt

fig = plt.figure()
ax = fig.add_subplot(projection="3d")
ax.invert_zaxis()

plt.show()

Resulting plot with the bug:
image

Resulting plot after this fix:
image

AI Disclosure

AI was used as a sparring partner to get acquainted with the repository and pinpointing the possible location of the bug.

PR checklist

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github-actions Bot commented Jul 3, 2026

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@rcomer rcomer added this to the v3.11.1 milestone Jul 4, 2026
scottshambaugh
scottshambaugh approved these changes Jul 6, 2026
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Looks like a nice clean fix to me, thanks @HakonSohoel!

scottshambaugh
scottshambaugh reviewed Jul 6, 2026
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Comment thread lib/mpl_toolkits/mplot3d/axis3d.py
@HakonSohoel
HakonSohoel force-pushed the fix-inverted-3d-axis-placement branch 2 times, most recently from 791edac to 904dc8f Compare July 7, 2026 08:58
scottshambaugh
scottshambaugh approved these changes Jul 7, 2026
View reviewed changes
Comment thread lib/mpl_toolkits/mplot3d/axis3d.py
@QuLogic
QuLogic force-pushed the fix-inverted-3d-axis-placement branch from 904dc8f to 0797150 Compare July 9, 2026 17:59
@QuLogic
QuLogic force-pushed the fix-inverted-3d-axis-placement branch from 0797150 to d618766 Compare July 9, 2026 18:04
@QuLogic
QuLogic merged commit 3281435 into matplotlib:main Jul 9, 2026
39 of 41 checks passed
@meeseeksmachine meeseeksmachine mentioned this pull request Jul 9, 2026
Merged
QuLogic added a commit that referenced this pull request Jul 10, 2026
@QuLogic @meeseeksmachine
Backport PR #31992: Fix: Axis and grid panes out of sync when inverti…
697a8ae 
…ng an axis
QuLogic added a commit that referenced this pull request Jul 10, 2026
@QuLogic
Merge pull request #32021 from meeseeksmachine/auto-backport-of-pr-31…
4ae406e 
…992-on-v3.11.x

Backport PR #31992 on branch v3.11.x (Fix: Axis and grid panes out of sync when inverting an axis)
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@QuLogic QuLogic QuLogic approved these changes
@scottshambaugh scottshambaugh scottshambaugh approved these changes

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[Bug]: Axis and grid panes out of sync, regression in 3.11

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