[vtkusers] VTK 7.0.0.RC1 (and releases before): X-OpenGL depth test(?) problems when using QVTKRenderWindow

[David Gobbi]

Hi Sophonet,

QVTKRenderWindowInteractor.py has a "main" and can be run as an example.
If you run it, does it show the same problem?

I recently tried it with VTK 7.0.0.rc1 and didn't see any depth buffer
issues (using Ubuntu 12.04).

 - David


On Thu, Jan 14, 2016 at 1:17 PM, Sophonet <vtk12af6bc42 at kant.sophonet.de>
wrote:

> Dear list,
>
> when trying to run a Qt Python application using the qt.QTVTKRenderWindow,
> there are depth test problems.
>
> Examples/Tutorial/Step1/Python/Cone.py works perfect, but with a simple
> QVTKRenderWindow example (based on
> https://gist.github.com/samueljohn/3090097, needs two more imports
> though), there are depth test problems, i.e. it appears that for some
> reason no depth test is applied (so the last drawn primitive is always
> visible on top).
>
> When doing
>
> export MESA_DEBUG=1
>
> before running the two scripts, there is one warning in the
> Examples/Tutorial/Step1/Python/Cone.py,
>
> Mesa warning: couldn't open libtxc_dxtn.so, software DXTn
> compression/decompression unavailable
>
> [but everything looks fine],
>
> but many more with the QVTKRenderWindow
>
> Mesa: User error: GL_INVALID_OPERATION in glDrawBuffer(buffer=0x405)
> Mesa: User error: GL_INVALID_OPERATION in glReadBuffer(buffer=0x405)
> ...
>
> I am running Mesa 9.2.3 on my system (OpenSUSE 13.1), so I cannot switch
> to the OpenGL2 rendering backend (which might resolve the problem? - don't
> know...).
>
> Any hints?
>
> Thanks,
>
>      sophonet
>
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