incomplete data in mpl_toolkits.mplot3d.art3d.Path3DCollection

[nschloe]

After creating a mpl_toolkits.mplot3d.art3d.Path3DCollection, e.g.,

from matplotlib import pyplot as plt
from mpl_toolkits.mplot3d.art3d import Path3DCollection
import numpy as np

pos = np.random.rand(3, 6)
print(pos.T)
fig = plt.figure()
ax = fig.add_subplot(projection='3d')
ax.scatter(pos[0], pos[1], pos[2], c=np.arange(pos.shape[1]))

I'd like to retrieve pos from the figure. As in 2D, I expected get_offsets to retrieve the data, but

for c in ax.get_children():
    if isinstance(c, Path3DCollection):
        print(c.get_offsets())

only returns the first two colums of pos.

[WeatherGod]

The problem is that these methods are used by the backends, which all
expect 2D data, so it can't return 3D data. Perhaps a get_3doffsets()
method should be created?

On Sun, Oct 9, 2016 at 6:37 PM, Nico Schlömer [email protected]
wrote:

After creating a mpl_toolkits.mplot3d.art3d.Path3DCollection, e.g.,

from matplotlib import pyplot as pltfrom mpl_toolkits.mplot3d import Axes3Dfrom mpl_toolkits.mplot3d.art3d import Path3DCollectionimport numpy as np

pos = np.random.rand(3, 6)print(pos)
fig = plt.figure()
ax = plt.gca(projection='3d')
ax.scatter(pos[0], pos[1], pos[2], c=np.arange(pos.shape[1]))

I'd like to retrieve pos from the figure. As in 2D, I expected get_offsets
to retrieve the data, but

for c in ax.get_children():
if isinstance(c, Path3DCollection):
print
print(c.get_offsets())

only returns the first two colums of pos.

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[nschloe]

If there is no other method for extracting the data, I'd vote for it.

[nschloe]

Any chance of this happening?

[WeatherGod]

Anything is possible. It is just a question of someone putting their mind to implementing it. What if we came up with a name for a method that would act as the "get_data()" for any artist? So, for 2D path collections, it would be get_offsets(), for images, it would be the image data, for 3d paths, it would be the untransformed 3d offsets? (note, get_data() is already taken). This is a MEP-worthy task, and once a MEP is made, it makes it much more likely it'll get implemented.

…

On Fri, May 26, 2017 at 9:15 AM, Nico Schlömer ***@***.***> wrote: Any chance of this happening? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#7243 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AARy-OiU8-pJfDTMND3lqeMEXIlFUXg9ks5r9tB9gaJpZM4KSIqR> .

[nschloe]

What does MEP mean?

I like the idea of a unifying get_data method. Perhaps get_raw_data would be appropriate.

[WeatherGod]

MEP == "Matplotlib Enhancement Proposal" http://matplotlib.org/devel/MEP/index.html

…

On Fri, Jun 2, 2017 at 6:15 PM, Nico Schlömer ***@***.***> wrote: What does MEP mean? I like the idea of a unifying get_data method. Perhaps get_raw_data would be appropriate. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#7243 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AARy-CpuCsRmnh8AdT-oUXKlixJSsjRWks5sAIl6gaJpZM4KSIqR> .

[cherry-ball]

I have the same problem and I want to know how to achieve it eventually? Would you please tell me? Thank you very much

[theRealSuperMario]

I had the same issue and simply used the property _offsets3d as a workaround, see here

[github-actions]

This issue has been marked "inactive" because it has been 365 days since the last comment. If this issue is still present in recent Matplotlib releases, or the feature request is still wanted, please leave a comment and this label will be removed. If there are no updates in another 30 days, this issue will be automatically closed, but you are free to re-open or create a new issue if needed. We value issue reports, and this procedure is meant to help us resurface and prioritize issues that have not been addressed yet, not make them disappear. Thanks for your help!

[nschloe]

Still present, feature still requested.