[vtkusers] vtkOpenGL* vs vtkMesa*

[Mayuresh Dalal]

Hey People,

I am using vtk 4.2 on a windows 2000 Pc with MSVC++ 6.0.

I have declared my render window as an instance of vtRenderWindow and 
renderer as vtkRenderer.

How does VTK determine if it should use  OpenGL or Mesa?

I have added a my own method to vtkOpenGLRenderWindow class and I want my 
renderwindow to call that method.

How do i do it?

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