mplot3d projection results in non-orthogonal axes

When viewed from above, the default grids are not square, but are distorted into diamonds/parallelograms depending on the vertical rotation angle:

import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D

fig = plt.figure()
ax = fig.gca(projection='3d')
ax.view_init(90,45)  # or by manual rotation
plt.show()

The projection should not include non-uniform scale (or skew) components by default. Furthermore, it's not at all obvious how to fix this as a user.

Couldn't find another issue that directly reports this, so put it here.

Related are #1104 and #1077

BUG: Fix matplotlibgh-8894, by always using a square position

TST: Add test verifying matplotlibgh-8894

Orthographic projection was added as an option in #8326

Is that what you are looking for?

No, I'm simply looking for correct perspective projection - the current implementation adds a linear distortion after projection, dependent on the aspect ratio of the window, which is something a perspective camera should never do.

Orthographic projection is also broken in exactly the same way

Ah, I see what you mean. Ok, I'll look into your PR later today, then.

…

On Wed, Jul 19, 2017 at 10:21 AM, Eric Wieser ***@***.***> wrote: No, I'm simply looking for correct perspective projection - the current implementation adds a linear distortion after projection, dependent on the aspect ratio of the window, which is something a perspective camera should never do. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#8894 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AARy-IwcmM8rLWONbzhiIcKQ3I9tcWMzks5sPg6ZgaJpZM4OZUUK> .

BUG: Fix the aspect ratio of 3d plots

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mplot3d projection results in non-orthogonal axes #8894

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mplot3d projection results in non-orthogonal axes #8894

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WeatherGod commented on Jul 19, 2017

eric-wieser commented on Jul 19, 2017

eric-wieser commented on Jul 19, 2017

WeatherGod commented on Jul 19, 2017

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