[Matplotlib-users] Transparency for pcolor slices in Axes3D plot

[Benjamin Root]

The ordering problem is well-known and is a limitation of the 2D rendering
engine of matplotlib. I call them "Escher Effects". No need to file a bug
report, there are plenty of discussions on ways to mitigate it in specific
instances, but ultimately, if you need a complex 3D scene, you may need to
use a true 3D rendering tool like mayavi or others. This is discussed on
the mplot3d main page.

I hope that helps!
Ben Root


On Fri, Mar 20, 2020 at 11:55 AM Akkana Peck <akkana at shallowsky.com> wrote:

> Thibaut Appel writes:
> > Dear matplotlib users/developers,
> >
> > I struggle to set some transparency in an Axes3D plot with series of
> > 2D-slices generated with pcolor. In spite of trying to set alpha, all the
> > slices remain opaque. I've just posted the issue on stackoverflow <
> https://stackoverflow.com/questions/60776103/how-to-enforce-transparency-for-pcolor-slices-within-axes3d-scope
> >,
>
> That image -- the way the 0.45 layer is drawn as if it's in front of
> the 0.40 layer -- illustrates a problem I've always had with Axes3D.
> I didn't have trouble making them transparent, but Axes3D sometimes
> makes the wrong decision about which layer is in front, so you get
> the wrong translucency. I have an illustration of the problem at
> http://shallowsky.com/blog/programming/matplotlib-3d-collection.html
> I always meant to file a bug on it but never did.
>
> Thibaut, I'm not sure why your alpha values aren't working, but you
> might want to compare my demo (linked from that page) to see
> what's different, since the alpha is working for me.
>
>         ...Akkana
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