[vtkusers] hardware accelerated offscreen rendering without diplaying window

Tue Jul 26 11:14:14 EDT 2011

Ok, I misunderstood the issue then, as I thought you wanted to use hardware
rendering but without the pop-up window. I don't use software rendering at
all in my process.

Thanks,

Adriano 

===================================

Adriano Gagliardi MEng PhD
Business Sector Leader
Computational Aerodynamics
Aircraft Research Association Ltd.
Manton Lane
Bedford

Tel: 01234 32 4644
E-mail: agagliardi at ara.co.uk
Url: www.ara.co.uk 
-----Original Message-----
From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On Behalf
Of Peter Schiemann
Sent: 26 July 2011 15:29
To: vtkusers at vtk.org
Subject: Re: [vtkusers] hardware accelerated offscreen rendering without
diplaying window

Hello Adriano,
the patch doesn't solve the problem. It modifies
vtkXOpenGLRenderWindow::CreateAWindow(), but not
vtkXOpenGLRenderWindow::CreateOffScreenWindow(w,h) which is called when set
to offscreen.
And I find this code in the same file:
----------------
#if defined( VTK_OPENGL_HAS_OSMESA )
  // OffScreen stuff
  OSMesaContext OffScreenContextId;
  void *OffScreenWindow;
#endif
----------------
You see that the offscreen stuff is only enabled when MESA(=software)
rendering is enabled. The same "#if defined( VTK_OPENGL_HAS_OSMESA )" is
repeated throughout vtkXOpenGLRenderWindow.cxx showing that offscreen stuff
is not compiled when not using MESA.

Regards,
Peter

-----Ursprüngliche Nachricht-----
Von: "Adriano Gagliardi" <agagliardi at ara.co.uk>
Gesendet: Jul 26, 2011 3:03:33 PM
An: "'Peter Schiemann'" <p.schiemann70 at web.de>, vtkusers at vtk.org
Betreff: RE: [vtkusers] hardware accelerated offscreen rendering without
diplaying window

>
>There is a patch that essentially comments out the lines of code that 
>cause the X-window to pop up. I've been using it for a couple of years 
>without
>issue:
>
>http://www.cmake.org/pipermail/paraview/2009-December/014908.html
>
>That should have the attachement on it (HideWindow.patch).
>
>Thanks,
>
>Adriano
>
>
>===================================
>
>Adriano Gagliardi MEng PhD
>Business Sector Leader
>Computational Aerodynamics
>Aircraft Research Association Ltd.
>Manton Lane
>Bedford
>
>Tel: 01234 32 4644
>E-mail: agagliardi at ara.co.uk
>Url: www.ara.co.uk
>-----Original Message-----
>From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On 
>Behalf Of Peter Schiemann
>Sent: 26 July 2011 13:47
>To: vtkusers at vtk.org
>Subject: Re: [vtkusers] hardware accelerated offscreen rendering 
>without diplaying window
>
>Hello Victor,
>with VTK you only have the choice of either accelerated rendering on a 
>physical display or software rendering which can be off screen. There 
>has been no attempt to support pure off screen with hardware support 
>for several years. As you say, the best alternative is Visit. What you 
>need works out of the box.
>If you need a solution in VTK, study the class 
>vtkXOpenGLRenderWindow.cxx and find out why it pops up an unnecessary
window although set to offscreen.
>I was told it is not difficult, but I am not familiar with X windows 
>programming.
>
>Good luck!
>Peter
>
>
>>Dear VTK gurus!
>>
>>I was wondering about the status of hardware accelerated offscreen
>rendering in VTK *without* displaying an X window on the server (linux 
>operating systems).
>>
>>If this is possible, can somebody please document the CMake settings 
>>and a
>usage example in the VTK Wiki?
>>
>>There have been several discussion threads on this issue, but I found 
>>no solution. They all gave up at some point. I guess 
>>http://www.vtk.org/Wiki/VTK/Examples
>>/Cxx/Utilities/OffScreenRendering is the "official" example, how to 
>>render
>offscreen. But unless compiled with software rendering, it still 
>displays an X window.
>>
>>If this is impossible with VTK, why?? VisIt is capable of hidden,
>accelerated offscreen rendering. SoQt can easily do it, too.
>>Is VTK designed differently, so that use of modern pbuffers or frame 
>>buffer
>objects is excluded? Then please say so, and people can make their choice.
>>
>>Thank you
>>Vic
>
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