[vtkusers] Remove parts of the volume displayed

[wassim_belhadj at topnet.tn]

Hi,

I'am using vtk for Volume Rendering and Qt4.

I want to remove parts of the volume displayed (unnecessary parts). 

Is there a VTK tool (an eraser) which provides this functionality.

I tried to use vtkBoxWidget but I have not been able to delineate the parts
that are between the two perpendicular planes of the BOx

Attached a screenshot that illustrates the problem.

Can someone help me...

Best Regards,
BELHADJ Wassim
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