[vtkusers] Mangled Mesa Volume Rendering

[Randall Hand]

OH, you aren't supposed to instantiate the vtkMesa classes directly..

Instead, you should tell the Factories to use Mesa Objects, and that will be
done for you automagically.  Put something like this at the top:

    // Indicate that we want to use Mesa Offscreen
    vtkGraphicsFactory *factGraphics = vtkGraphicsFactory::New();
    factGraphics->SetUseMesaClasses(1);
    factGraphics->Delete();

    vtkImagingFactory *factImage = vtkImagingFactory::New();
    factImage->SetUseMesaClasses(1);
    factImage->Delete();



Fyi, this has been dealt with before:
http://public.kitware.com/pipermail/vtkusers/2005-March/078880.html

Kitware guys, is there anything that can be done to make this a bit more
"explicit"?  Like put something in the mesa-object construtors to see if the
factories are configured for Mesa Classes & spit out a warning or an error?
On 5/10/06, Kevin H. Hobbs <kevin.hobbs.1 at ohiou.edu> wrote:
>
> On Tue, 2006-05-09 at 14:02 -0400, Kevin H. Hobbs wrote:
> > I've slowly been isolating my problem with making a volume rendered
> > movie offscreen on our MPI cluster.
> >
> > I'm using VTK from CVS.
> >
> > The mangled Mesa I've been using most is version 6.4.2.
> >
> > The example VTK/Examples/MangledMesa/Tcl/OffScreenCone.tcl works but the
> > attached code, based off of it and
> > VTK/Examples/VolumeRendering/Tcl/IntermixedUnstructuredGrid.tcl, does
> > not work. I just get a black image.
> >
> > An added annoyance is that when I build VTK with mangled mesa regular
> > rendering segfaults.
>
> It seems I was using the wrong threshold. So The GL version was
> correctly rendering a black and transparent volume on a black
> background. After fixing that, I think I have the problem isolated to
> Offscreen Volume Rendering alone.
>
> The attached OSVolumeRender.cxx can easily be switched between
> off-screen and on-screen rendering with a few comments.
>
> When vtkRenderer and vtkRenderWindow are used, the SetOffScreenRendering
> line is commented out, and I use my VTK without mangled mesa the program
> works.
>
> When vtkMesaRenderer and vtkXMesaRenderWindow are used, the
> SetOffScreenRendering line is included, and my VTK with mangled mesa is
> used, the program segfaults at render().
>
> Again, onscreen rendering works, offscreen rendering works, onscreen
> volume rendering works, offscreen volume rendering does not work.
>
>
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.3 (GNU/Linux)
>
> iD8DBQBEYhwuqBtEuW+gRPERAoljAJ9cJPgT46X7INg4r4WN9zo1xO+aGQCffmhZ
> uTqv3Yg9ggaNHnj1V5TVTCM=
> =X7NS
> -----END PGP SIGNATURE-----
>
>
> _______________________________________________
> This is the private VTK discussion list.
> Please keep messages on-topic. Check the FAQ at:
> http://www.vtk.org/Wiki/VTK_FAQ
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers
>
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20060510/8b0df989/attachment.htm>