[vtkusers] Offscreen Rendering & Linux

[endlosschleife1]

Hi Lars,

sorry for the late reply. Thanks a lot! I just tried this out. It does seem
to not open the X Window, but I still need a X connection, otherwise my code
terminates when it calls the GetDesiredVisualInfo() method. For my purposes
I would need a VTK based rendering service that I can interact with remotely
(starting it from a SSH terminal, sending rendered data to a client through
a socket etc.). I will look into this some more. I wonder if I can hardcode
all the information that the render window needs and tries to retrieve from
the display.

Thanks again!

Mark



2010/10/3 Lars Friedrich Lars <lars-friedrich at gmx.net>

> 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
> > > _______________________________________________
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> >
> > --
> > | Aashish Chaudhary
> > | R&D Engineer
> > | Kitware Inc.
> > | www.kitware.com
>
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