ENH: Add QuadricVisualization from VTK Book.
ENH: Add QuadricVisualization from VTK Book.

lorensen/VTKExamples,lorensen/VTKExamples,lorensen/VTKExamples,lorensen/VTKExamples,lorensen/VTKExamples,lorensen/VTKExamples,lorensen/VTKExamples