On 08/10/2010 04:44 PM, tom fogal wrote: > "Kevin H. Hobbs" <hob...@ohiou.edu> writes: >> >> VTK_USE_X:BOOL=ON is set the test segfaults. > > What does VTK_USE_X change/end up doing? >
Most of the action seems to happen in Rendering/CMakeLists.txt where on
linux with VTK_USE_X=ON :
vtkXGPUInfoList.cxx is added to the list of sources.
vtkXRenderWindowInteractor.cxx is added to the list of sources.
cmake options for 3Dconnexion are exposed
vtkTestGLX.cmake is included
a try compile is made on CheckglXGetProcAddressARB.cxx
if OPENGL_gl_LIBRARY is also set
vtkXOpenGLRenderWindow.cxx is added to the list of sources.
and ${OPENGL_gl_LIBRARY} is added to the required libraries.
I'm leaving out stuff that seems to be for wrapping tcl and python.
a bunch of likely X11 directories are added to the search path.
cmake looks for X11 libraries
> It seems like the test should only be calling OSMesa functions.
> However, maybe the VTK_USE_X macro forces some "always do this X init"
> kind of stuff, even when an X context isn't needed?
>
> -tom
>
It's certainly possible. The test only does :
vtkRenderWindow *renWin = vtkRenderWindow::New();
renWin->OffScreenRenderingOn();
And I've always found that I have to do :
// Graphics Factory
vtkGraphicsFactory * graphics_factory
= vtkGraphicsFactory::New();
graphics_factory->SetOffScreenOnlyMode( 1);
graphics_factory->SetUseMesaClasses( 1 );
// Imaging Factory
vtkImagingFactory * imaging_factory
= vtkImagingFactory::New();
imaging_factory->SetUseMesaClasses( 1 );
// Render Window
vtkRenderWindow * render_window = vtkRenderWindow::New();
render_window->SetOffScreenRendering( 1 );
in order to get an offscreen program to run without DISPLAY set.
VTK does have another "offscreen" mode pbuffers or something that still
requires a display but can't be overwritten with another window.
Maybe this is what's being used in the VTK test.
However even if I add the factory lines to VTK's test the segfault
happens the same way.
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