[vtkusers] Python/VTK offscreen / headless rendering

[Max Smolens]

Hi Robert,

The conda-forge channel includes a variant of the vtk package that supports
offscreen rendering with OSMesa. This variant is chosen automatically if
the mesalib package is installed when installing vtk:

conda config --add channels conda-forge
conda install mesalib vtk


HTH,
Max

On Fri, Apr 27, 2018 at 7:16 AM, Robert.Atwood at diamond.ac.uk <
Robert.Atwood at diamond.ac.uk> wrote:

> Hi, Paul
> The difference is to get to the point where there is something rendered,
> without having to open a window on the terminal.
> In the case where I already know (or can calculate from the image data)
> the colour function and the transparency function, I know what camera angle
> I want and so on, I just want to run a background job on a remote
> workstation/cluster node to render that same view for a number of similar
> images (of the same object in different time steps) Instead of sitting on
> my computer watching it.
>
> But, the problem is that with the way I know how to do it, the creation of
> the render window trys to get a GL context, but it can't do that .
>
> If I try in python on a X-window connection even, I get the following
> ERROR: In /home/ilan/minonda/conda-bld/work/VTK-6.3.0/Rendering/
> OpenGL/vtkXOpenGLRenderWindow.cxx, line 394
> vtkXOpenGLRenderWindow (0x7f47c0fda000): Could not find a decent visual
>
>
> But maye the capability isn't compiled into the python package  from
> Anaconda??
> Is there a python package  I can grab that has software rendering?
>
>
>
>
> I tried to buld the c++ from source of 7.1.1. But not successfully. ..
>
> ./CylinderRenderingProperties
> ERROR: In /dls/science/users/kny48981/sources/vtk/VTK-7.1.1/
> Rendering/OpenGL2/vtkXOpenGLRenderWindow.cxx, line 320
> vtkXOpenGLRenderWindow (0xfc18a0): Could not find a decent config
>
>
>
>
>
>
> > -----Original Message-----
> > From: Paul Korir [mailto:pkorir at ebi.ac.uk]
> > Sent: 27 April 2018 11:09
> > To: Atwood, Robert (DLSLtd,RAL,SCI); 'vtkusers at vtk.org'
> > Subject: Re: [vtkusers] Python/VTK offscreen / headless rendering
> >
> > How different is what you need from writing the rendered output directly
> > to a file using one of the vtk*Writer classes?
> >
> > Correct me if I'm missing something.
> >
> > Paul K. Korir, PhD
> > Scientific Programmer
> > EMBL-EBI
> > 01223494422
> >
> > On 23/04/2018 11:52, Robert.Atwood at diamond.ac.uk wrote:
> > > Hi,
> > > I would like to have a Python script to render several volume images
> > (tomography data)  on a headless machine. I could not find any advice
> more
> > recent than 2011 , is this something that just isn't configured in the
> Python as
> > installed from existing packages? How do I tell?
> > > If it's not in the python , what needs to be done, at the time of prior
> > questions it seemed to be a compile-time option of the VTK library, is
> that
> > still the case, Any exaples on line that are for the current release ?
> > > Thanks
> > > Robert
> > >
> > >
> > >
>
>
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