[vtkusers] How to add two or more vtkLineWidgets or vtkPlaneWidgets to a RenderWindows??

[Patrik Spring]

Hi vtkusers!
  I need to add two or more vtkLineWidgets to a RenderWindows (display a Dicom ) to caculate their angle! But I only can add one ? why?
  who can give me some ideas?????
   
  Thank advanced!
   

		
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