[vtkusers] Draw out a cubical box on the rendering window

[Rashed Karim]

Hi everyone,

I have a surface rendering of an object, and I allow the user to pick points
on the surface. The applicaton starts region-growing segmentation using the
seed points picked. I want to restrict the region growing process by
allowing the user to define/draw out a cubical box on the rendering window,
beyond which the region cant grow. Does anyone know how I could go about
doing this.

Any help will be appreciated. Thanks in advance.

-- 
Rashed karim
PhD student
Imperial College London
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