[vtkusers] plot a line and a cruve in *vtkMRMLScalarVolumeNode object

[roboticprogramming]

I have 3D volume of a medical image in *vtkMRMLScalarVolumeNode. I want to
draw a curved line (like a circle) around some regions of the image such as
tumors. How can I do that in this volume which is a
*vtkMRMLScalarVolumeNode? 

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