[vtkusers] Offscreen Rendering & Linux

[Lars Friedrich Lars]

Hello Mark,


I'm having a comparable problem. I found a solution that works for me, maybe this is also a solution to your situation ...

Basically, I want to hide the X-window when using GL hardware off-screen rendering. My first experiments involved XUnmapWindow - however, as the X window is initially mapped in the CreateAWindow()-method, the window will appear at least for a few milliseconds prior to calling XUnmapWindow(). This is neither "nice", nor a solution to your problem.

Therefore, I inherited from vtkXOpenGLRenderWindow and overrode the CreateAWindow()-method. I simply eliminated the code block that calls XMapWindow() initially -> the off-screen window never gets mapped ...

The inherited class is however suboptimal, as I had to redefine the vtkXOpenGLRenderWindowInternal class (forward declaration ...).

I attachted a simple example (hidex.cxx) that makes use of the simple inherited class. If you want, try it, and please let me know whether or not it works for you.


regards, 

lars




-------- Original-Nachricht --------
> Datum: Thu, 23 Sep 2010 10:54:54 -0400
> Von: Aashish Chaudhary <aashish.chaudhary at kitware.com>
> An: endlosschleife1 <endlosschleife1 at googlemail.com>
> CC: vtkusers at vtk.org
> Betreff: Re: [vtkusers] Offscreen Rendering & Linux

> Mark,
> 
> I believe that as of now if you want to use OpenGL driver and not Mesa it
> requires opening an windows or else you have to use Mesa (like you did).
> There is no workaround for the former case.
> 
> On Thu, Sep 23, 2010 at 6:48 AM, endlosschleife1 <
> endlosschleife1 at googlemail.com> wrote:
> 
> > Hello,
> >
> > has anybody some experience with doing offscreen rendering under Linux
> with
> > graphics acceleration support and give me some hints on how to get this
> to
> > work?
> >
> > I'm using a vtkOpenGLRenderWindow and set OffScreenRendering to on. With
> > that it does really not render into a window, but VTK still opens an X
> > Window (apparently it needs its handle). So for instance when I try to
> start
> > a VTK based app remotely via SSH I get the following error message:
> >
> > # An unexpected error has been detected by Java Runtime Environment:
> > #
> > #  SIGSEGV (0xb) at pc=0xb2b5b4f5, pid=16472, tid=3044047776
> > #
> > # Java VM: Java HotSpot(TM) Client VM (1.6.0-b105 mixed mode, sharing)
> > # Problematic frame:
> > # C  [libvtkRenderingJava.so.5.6.0+0x66c4f5]
> > _ZN22vtkXOpenGLRenderWindow13CreateAWindowEv+0x37b
> > #
> > # An error report file with more information is saved as
> > hs_err_pid16472.log
> > #
> > # If you would like to submit a bug report, please visit:
> > #   http://java.sun.com/webapps/bugreport/crash.jsp
> > #
> >
> > Is there any way around the need for VTK to open an X window? Basically
> I
> > would like to know if that problem is even fixable or if I need to look
> for
> > other workarounds.
> >
> > When I build VTK with MESA enabled it works, but the performance without
> > accelaration is unacceptable.
> >
> > Thanks,
> > Mark
> > _______________________________________________
> > Powered by www.kitware.com
> >
> > Visit other Kitware open-source projects at
> > http://www.kitware.com/opensource/opensource.html
> >
> > Please keep messages on-topic and check the VTK FAQ at:
> > http://www.vtk.org/Wiki/VTK_FAQ
> >
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> >
> >
> 
> 
> -- 
> | Aashish Chaudhary
> | R&D Engineer
> | Kitware Inc.
> | www.kitware.com

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cmake_minimum_required(VERSION 2.6)
 
PROJECT(hidex)
 
FIND_PACKAGE(VTK REQUIRED)
INCLUDE(${VTK_USE_FILE})

ADD_EXECUTABLE(hidex hidex.cxx vtkInvisibleXOpenGLRenderWindow.h vtkInvisibleXOpenGLRenderWindow.cxx)
TARGET_LINK_LIBRARIES(hidex vtkIO vtkCommon vtkRendering)

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