[vtkusers] Python/VTK offscreen / headless rendering

Fri Apr 27 09:25:03 EDT 2018

HI Isaiah,

Thanks for the link. However , it defies comprehension (by me)

The link which you sent claims the following,

2-> You can use a modern version of X that supports running a dummy framebuffer. This can be installed in user mode so you don't even need to have root on the system.
Xdummy standlone
You can start a new display using the dummy driver without needing any special privileges (no root, no suid), you should specify your own log and config files:
Xorg -noreset +extension GLX +extension RANDR +extension RENDER -logfile ./10.log -config ./xorg.conf :10

However, the link within the link that this link refers to does not say anything about how o install it in user mode. Do you know anyting about that ?
The nodes do not have Xorg installed.
A workstation already has Xorg running so I don’t understand  If I run as specified in the link, it either doesn’t work *cannot specify –logfile with elevated priviliges*  or else if I skip the logfile, it opens a *real* display on top of my display.
I don’t understand which part of the command is supposed to access the dummy driver.

com09-10 ~]$ Xorg
-bash: Xorg: command not found

From: Isaiah Norton [mailto:isaiah.norton at gmail.com]
Sent: 26 April 2018 19:28
To: Atwood, Robert (DLSLtd,RAL,SCI)
Cc: vtkusers at vtk.org
Subject: Re: [vtkusers] Python/VTK offscreen / headless rendering

Depends on the OS, but for Linux see some links to discussion/resources here:

https://www.slicer.org/wiki/Documentation/Nightly/Developers/Python_scripting#How_can_I_run_Slicer_on_a_headless_compute_node.3F

On Mon, Apr 23, 2018 at 6:52 AM, Robert.Atwood at diamond.ac.uk<mailto:Robert.Atwood at diamond.ac.uk> <Robert.Atwood at diamond.ac.uk<mailto: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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