How can we pass a line through two mark up fiducials ? Or even three of them. Like making an axis to join them.

If you have two points in a markups fiducial node ‘F’, you can create a new markups line node using the snippet: F=getNode('F') L=slicer.mrmlScene.AddNewNodeByClass('vtkMRMLMarkupsLineNode') firstPoint = F.GetNthControlPointPositionVector(0) L.AddControlPoint(firstPoint) secondPoint = F.GetNthContr…

[image] smrolfe: F=getNode('F') L=slicer.mrmlScene.AddNewNodeByClass('vtkMRMLMarkupsLineNode') firstPoint = F.GetNthControlPointPositionVector(0) L.AddControlPoint(firstPoint) secondPoint = F.GetNthControlPointPositionVector(1) L.AddControlPoint(secondPoint) Hi @smrolfe , I was wondering how …

Do you know the index of the control point in each node? If so, you can use the same method but select the second control point from a different node. If you need to do this by control point name, you can loop through the points in each node, use c1.GetNthControlPointLabel() to get the point name, …

Thank you for the quick reply @smrolfe ! I am quite unfamiliar with python scripting - can you point me to a guide on how to apply the c1.GetNthControlPointLabel() function? I tried replacing the initial code with your suggestion like this: L=slicer.mrmlScene.AddNewNodeByClass('vtkMRMLMarkupsLine…

If you are collecting landmark points, I strongly recommend that you use the same order every time, i.e. “prn-porion” has the same landmark number for each subject. If some subjects are missing points, these can be included with the position set to missing. Please see our tutorials on the control po…

[image] esomjai: However, I keep getting the error message: NameError: name ‘c1’ is not defined For the example above, replace c1 with F. The function GetNthControlPointLabel() takes an integer point number and returns a string with the point name. So to check the name at point 0, you can use…

[image] smrolfe: If you are collecting landmark points, I strongly recommend that you use the same order every time, i.e. “prn-porion” has the same landmark number for each subject You can also find a control point by label. I’ve just tried and bing chat provides a perfect answer: [image] I…

Thank you @lassoan ! I realise it is a quite simple question, thank you for taking the time to answer it. My Bing search was less successful (although having asked the same question) - would you mind providing me with the full code you got?

How to join two or more fiducials by a line?

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How to join two or more fiducials by a line?

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