Is there a way to convert the vtkMRMLMarkupsFiducialNode to a vtkMRMLLabelmapVolumeNode?
I suppose that if I can get the polydata of the FiducialNode, I can convert it to a SegmentationNode then convert the SegmentationNode to a binary labelmap, is it possible?
This is what I’d do. Make sure you have a different model node for each fiducial, and have them in a folder in subject hierarchy, then you can convert them to a segmentation node right-clicking the folder.