[vtkusers] How to make a tubeview using VTK

[Sahan Ranasinghe]

Dear All,

I am a postgraduate student and I am developing a software for the
laparoscopic surgery. I make a 3D image and then I need to put a mask which
is black everywhere but in the center for a radious of about 500
pixels....through which I want to see my 3D model behind.
I tried to change vtkCamera - SetViewAngle, vtkWarpLens, but failed. If
anyone knows how to do it, please let me know. Thank you.

Regards,
Sahan
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