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[Bug]: 3D bar chart appears over axis when using zlim #29482

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XrioBtw opened this issue Jan 18, 2025 · 8 comments
Open

[Bug]: 3D bar chart appears over axis when using zlim #29482

XrioBtw opened this issue Jan 18, 2025 · 8 comments
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status: confirmed bug topic: mplot3d

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@XrioBtw
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XrioBtw commented Jan 18, 2025 •
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Bug summary

When I make a 3D bar chart with Matplotlib and change the z axis limits using ax.set_zlim(newMin, newMax) the part of the bar charts below the new z axis minimum value appears above the x and y axis. I would like to ensure that the x and y axis always renders at the top, but I don't know how to achieve this. I tried ax.set_zorder(bigNumber) and ax.xaxis.set_zorder(bigNumber), but it didn't change anything.

Code for reproduction

fig, ax = plt.subplots(subplot_kw = {"projection" : "3d"})
ax.bar3d([1, 1, 2, 2], [1, 2, 1, 2], 0, 1, 1, [2, 3, 1, 4])
ax.set_zlim(2, 4)
ax.set_zorder(10000000) # does not help
plt.show()

Actual outcome

The actual outcome looks like this, where the bar charts render over the x and y axis:

actual-outcome

Expected outcome

Either left or right would be expected outcome:

expected-outcome

Additional information

No response

Operating system

Windows

Matplotlib Version

3.6.0

Matplotlib Backend

TkAgg

Python version

3.10.6

Jupyter version

No response

Installation

pip
@timhoffm
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Also happens with 3.10.

@WeatherGod
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WeatherGod commented Jan 19, 2025 via email

@scottshambaugh
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scottshambaugh commented Jan 23, 2025 •
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Thank you @XrioBtw for the great expected outcome images, those really help clarify the question!

This is somewhat a duplicate of #8902

However, I do think there is a good argument for drawing the axes with the same zorder sorting as the rest of the elements, like the bottom right plot. So let's keep this issue open with a focus on that aspect of the question.

@WeatherGod
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WeatherGod commented Jan 23, 2025 via email

@scottshambaugh
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scottshambaugh commented Jan 28, 2025 •
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Yeah I agree the panes should always be in the back. I do think it's worth experimenting with the axis spines, ticks, and labels either always being on top or getting z order sorted. The bottom right plot seems clearly better than the top one, but I'm sure there's some lurking edge cases.

@sgwu
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sgwu commented Feb 11, 2025

This is a separate but somewhat related issue. I tried to set the z-axis limit using ax.set_zlim(), but the final limit in the plot always appears to go beyond the set limit. Take @XrioBtw 's plot as an example, the set limit is (2,4), but the actual limit goes below 2 and above 4:

Image

Is there a way to set the z limits exactly as those intended?

@scottshambaugh
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scottshambaugh commented Feb 11, 2025 •
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Hi @sgwu, I would upgrade! That behavior was finally fixed in matplotlib 3.9.0, see: https://matplotlib.org/stable/users/prev_whats_new/whats_new_3.9.0.html#setting-3d-axis-limits-now-set-the-limits-exactly

@sgwu
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sgwu commented Feb 12, 2025

Thanks @scottshambaugh, this solves my problem!

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@WeatherGod @timhoffm @scottshambaugh @XrioBtw @sgwu