[vtkusers] VTK_USE_OFFSCREEN

[Hoang Hoang]

hi,
 I turned on the VTK_USE_MANGLE_MESA and the VTK_USE_OFFSCREEN option when
building vtk (with Mesa 6.4.2). After I do that every  vtkRenderWindow has a
default OffScreenRendering equals to 1,the problem is I cannot change that
value to zero (it means I cannot display it on screen).  But when I turned
off the VTK_USE_OFFSCREEN option,  the default value was 0 and I could not
change it to 1.
 somebody can help me?
thanks.
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