On Sun, Jul 18, 2010 at 8:56 AM, João Luís Silva <jsi...@fc.up.pt> wrote:
> On 07/18/2010 04:58 AM, H Mike Duan wrote:
> > Hi,
> >
> > There seems to be a problem in how 3D surfaces and lines are rendered
> > in mplot3d. The following is a simple script that plots a yellow
> > sphere, a blue wireframe on the surface of the sphere, and a red
> > wireframe outside the sphere. The semi-transparent yellow sphere is
> > rendered beautifully. The blue wireframe can only be seen with certain
> > viewing angles. The red wireframe is seen all the time, but its part
> > that is supposedly behind the sphere appears in front of the sphere.
> > Did I do something wrong or is it a bug of mplot3d? I am using
> > matplotlib 1.0.0 on Mac OS X 10.6. Thanks!
> >
> > -Mike
>
> Additionally the presented example (after adding a plt.show()) will give
> the appended traceback if the sphere is panned around. That won't happen
> if the line
>
> ax = fig.gca(projection='3d')
>
> is replaced with:
>
> ax = Axes3D(fig)
>
> Latest mpl svn (r8565), OS: Debian testing.
>
> Regards,
> João Luís
>
>
>
> Traceback (most recent call last):
> File
>
> "/usr/local/lib/python2.6/dist-packages/matplotlib/backends/backend_gtk.py",
> line 253, in button_release_event
> FigureCanvasBase.button_release_event(self, x, y, event.button,
> guiEvent=event)
> File
> "/usr/local/lib/python2.6/dist-packages/matplotlib/backend_bases.py",
> line 1603, in button_release_event
> self.callbacks.process(s, event)
> File "/usr/local/lib/python2.6/dist-packages/matplotlib/cbook.py",
> line 262, in process
> proxy(*args, **kwargs)
> File "/usr/local/lib/python2.6/dist-packages/matplotlib/cbook.py",
> line 188, in __call__
> return mtd(*args, **kwargs)
> File
> "/usr/local/lib/python2.6/dist-packages/matplotlib/backend_bases.py",
> line 2575, in release_pan
> a.end_pan()
> File "/usr/local/lib/python2.6/dist-packages/matplotlib/axes.py",
> line 2788, in end_pan
> del self._pan_start
> AttributeError: _pan_start
>
>
>
Joao,
Yes, there is a known issue with objects not properly rendering when viewed
at certain angles. How to go about solving this seems to be a difficult one
to figure out.
Also, thanks for pointing out the difference between calling gca() and
creating the Axes3D object directly. I am not sure exactly why there would
be a difference, but I will look into it right away.
Ben Root
>
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