[vtkusers] Off screen rendering problem

[Jochen Schulz]

Hello!

i want to use offscreen-rendering with VTK and it was already
functioning when i upgraded from SuSE 7.2 to 8.2 .  That upgrade
unfortunately destroyed that functionality. I have VTK-4.2.2 and Mesa
5.0-66. VTK is compiled with
VTK_OPENGL_HAS_OSMESA:BOOL=ON
and no mangled mesa.

When i run my program i get the following error when trying to do
offscreen-rendering:

Program received signal SIGSEGV, Segmentation fault.
0x40a0b483 in OSMesaCreateContextExt () from
/usr/local/lib/vtk/libvtkRendering.so
(gdb) info thread
* 1 Thread 16384 (LWP 27887)  0x40a0b483 in OSMesaCreateContextExt () from
/usr/local/lib/vtk/libvtkRendering.so
(gdb) backtrace
#0  0x40a0b483 in OSMesaCreateContextExt () from
/usr/local/lib/vtk/libvtkRendering.so
#1  0x40a0b280 in OSMesaCreateContext () from
/usr/local/lib/vtk/libvtkRendering.so
#2  0x40a068d0 in vtkXOpenGLRenderWindow::WindowInitialize() () from
/usr/local/lib/vtk/libvtkRendering.so
#3  0x40a09727 in vtkXOpenGLRenderWindow::SetOffScreenRendering(int) () from
/usr/local/lib/vtk/libvtkRendering.so
#4  0x08063a39 in mvtkWindow::offscreenrender() (this=0x8213778) at
matvtk.cc:170
#5  0x08063289 in main (argc=1, argv=0xbffff264) at matvtktest.cc:88
#6  0x413608ae in __libc_start_main () from /lib/libc.so.6

And i have no idea whats wrong. It would be very nice if someone could
somehow help me with this.

	regards
		Jochen

**************************** 
Jochen Schulz 
Institute for Numerical and 
Applied Mathematics 
University of Goettingen 
Lotzestr. 16-18  
D-37083 Goettingen, Germany 
****************************