Re: [Matplotlib-users] Roll and offset around viewpoint with Axes3D

[Benjamin R. <ben...@ou...>]

On Thu, May 5, 2011 at 6:32 PM, Frederic Vogt <fv...@ms...> wrote:

>
> As for the roll issue described below :
>
> how hard would it be to implement something similar to
>
> tr = Affine2D().scale(2, 1).rotate_deg(30)
>
> inside mplot3D ? Where should I start ?
>
> All I want basically is define my viewpoint with 6 parameters (elev, azim,
> distance, roll, pitch and yaw), and not just 2 (elev,azim). I know it can
> be done interactively, but I want(need) to script it.
>
> Any suggestions ?
>
> Fréd
>
>
Fred,

Ideally, it should be possible to redefine mplot3d's transformations so that
this is possible within matplotlib's current framework... if mplot3d
actually used transforms like the rest of matplotlib.  Unfortunately, a lot
of stuff is hard-coded.  You could take a look at the proj3d.py file in
matplotlib/lib/mpl_toolkits/mplot3d.  The event handling code is in
axes3d.py in the same directory.  Note that things are a bit of a mess, and
if you want to help me out with improving it, I would suggest working off of
the master branch on github.

I have also been working towards improving matplotlib's transforms framework
so that it could one day be capable of handling N-D inputs (right now it
assumes 1-D).  Once the transforms framework gets improved, then I
anticipate getting mplot3d updated to use real transforms, which should make
your goal a lot easier.  But I don't see that happening for a while now.

So, in the meantime, I would welcome any and all patches to improve the
current  mplot3d code.

Ben Root