[Insight-users] Point Extraction

[Cameron Burnett]

You can use a vtkPointWidget to select a point on a 3D object. 

vtkPointWidget *pointWidget = vtkPointWidget::New();
  pointWidget->SetInteractor(renderer->GetRenderWindow()->GetInteractor());
  pointWidget->SetPlaceFactor(1.25);    //this sets the widget to appear a small distance away from the object edges
  pointWidget->SetProp3D(volume);    // this tells the widget to attach itself to (in this case) a vtkVolume called volume
  pointWidget->PlaceWidget();
  pointWidget->On();

You can then get the current xyz coordinates with pointWidget->GetPosition()[0] where 0 is the x coordinate and 1 & 2 are y & z

Note that the point widget gives you physical coordinates. If you want a pixel index then you need to use the TransformPhysicalPointToIndex function.

I'm not sure if you can use this on 2D images as well, but I would imagine so.

Hope this helps a bit.

Regards,
Cameron.


> Date: Wed, 23 Apr 2008 14:14:41 +0200
> From: njiwa at biomed.ee.ethz.ch
> To: insight-users at itk.org
> Subject: [Insight-users] Point Extraction
> 
> Hi everybody,
>  
> I have two images and would like to perfom IterativeClosestPoint on these images. I have a problem because i don't have the coordinate of the points. Is there a way of getting tese points with ITK?
> Do somebody help me to solve this problem? I have 2D and 3D images. Thanks a lot.
>  
> Regards,
>  
> Josiane.
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> Insight-users mailing list
> Insight-users at itk.org
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