[vtkusers] How to set the coordinate system

[KS Jothybasu]

Hi all,

I am rendering a Ct image using vtkRenderer, now I want to add a circle over
the image. Suppose if I set the radius of the circle to 5cm it should cover
5cm on the image as well.

How to seup the coordinate system properly?

I tried using Renderer.ViewToWorld(), my app hangs!

Thanks

Jothy
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