Orthogonal projection for mplot3d

It would be nice to be able to view 3D plots without the distortions caused by perspective projection. Orthogonal projection allows easier comparison of different elements of a plot, especially when viewing the plot close to the direction of an axis.

Implementation requires orthogonal replacement for persp_transformation() in mpl_toolkits.mplot3d.proj3d and a constructor parameter that selects which projection is used in Axes3D.

As monkey patch, the following seems to do the job, but breaks at least automatic placement of axis labels.

import numpy
from mpl_toolkits.mplot3d import proj3d
def orthogonal_proj(zfront, zback):
    a = (zfront+zback)/(zfront-zback)
    b = -2*(zfront*zback)/(zfront-zback)
    return numpy.array([[1,0,0,0],
                        [0,1,0,0],
                        [0,0,a,b],
                        [0,0,0,zback]])
proj3d.persp_transformation = orthogonal_proj

I wonder, if the above patch was added to the release?

@aglie

@aglie I do not think so. If you are interested in turning this patch into a PR I think we would be happy to review it.

It would need some documentation and tests added before it could be merged.

@tazle

PR still welcome here. Looks simple but we should be careful of breaks as @tazle mentions

Recommend labeling as Difficulty: Easy

@WeatherGod

I don't think much of anything involving mplot3d rates as "easy", and I suspect a PR for this feature involves a bit more than the 2011 monkey patch above suggests. @WeatherGod can change the label if he disagrees.

Hi

I couldn't correctly implement this patch to use it with Axes3D, could any one help me with an example if possible

Thank you all,

This was implemented in v2.1: https://matplotlib.org/users/whats_new.html#orthographic-projection-for-mplot3d

…

On Wed, Jan 31, 2018 at 10:48 AM, RamiGASMI ***@***.***> wrote: Hi I couldn't correctly implement this patch to use it with Axes3D, could any one help me with an example if possible Thank you all, — You are receiving this because you modified the open/close state. Reply to this email directly, view it on GitHub <#537 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AARy-HEiMmUnyKhKXvNmyiMmA8zRZtUhks5tQItdgaJpZM4C2w7n> .

corrected link:
https://matplotlib.org/users/prev_whats_new/whats_new_2.1.0.html?highlight=orthographic#orthographic-projection-for-mplot3d

Navigation Menu

Repository navigation

Orthogonal projection for mplot3d #537

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Orthogonal projection for mplot3d #537

Description

Activity

tazle commented on Oct 18, 2011

aglie commented on Nov 4, 2014

tacaswell commented on Nov 4, 2014

petehuang commented on Dec 30, 2016

efiring commented on Jan 3, 2017

RamiGASMI commented on Jan 31, 2018

WeatherGod commented on Jan 31, 2018

benmaier commented on May 7, 2018

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions