[vtkusers] gradient background direction

[Nelson]

Hope the following would help.

vtkSmartPointer<vtkRenderer> ren = vtkSmartPointer<vtkRenderer>::New();
// Mapper
// Actor
ren->GradientBackgroundOn();
ren->SetBackground( <your first color> );
ren->SetBackground2( <your second color> );
ren->SetGradientBackground( true );

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Regards,
Nelson
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