[vtkusers] expose slowness under X windows

[Jeff Lee]

try printing out renWin->ReportCapabilities() and look for hardware support.
-Jeff

John Hunter wrote:

>>>>>>"Mathieu" == Mathieu Malaterre <mathieu.malaterre at kitware.com> writes:
>>>>>>            
>>>>>>
>
>    Mathieu> John, Your python script works very fast on my linux box:
>    Mathieu> Using ATI latest binary -closed source- driver. Are you
>    Mathieu> sure you are not using software rendering (mesa) ?
>
>When I print my render window, I get
>
>render window : vtkXOpenGLRenderWindow
>renderer      : vtkOpenGLRenderer
>interactor    : vtkXRenderWindowInteractor 
>
>I read this to mean I'm doing hardware rendering.  Is this correct?
>
>And I can interact with my data at very high speed as long as I don't
>need to switch between my render window and other overlapping X
>windows, which also makes me believe that hardware rendering is
>working.
>
>Cheers,
>John Hunter
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