Send single Fiducial- OpenIGTLink

Support
1

Hi,
I am writing an User Interface with Python Qt and SlicerDesigner and I am using OpenIGTLink for communication with external device.
I send the whole Fiducial List with :
connectorNode.RegisterOutgoingMRMLNode(FiducialList), but can I send only one fiducial of the list?

I don’t know how to access the position of the single fiducial and send it as VTK object.

Thank you

2

Which version of Slicer are you using?

In Slicer <= 4.8.1 OpenIGTLinkIF had the ability to send/receive points using a vtkMRMLMarkupsFiducialNode.

The current version of OpenIGTLink in Slicer does not currently support point messages.

3

I noticed this problem with Slicer 4.10.
In 4.8 I can send points with OpenigtlinkIF but all the points of the markupsList. For example if I have a fiducialList with three points: p0,p1,p2 how can I send only p2?

4

Looking at the implementation of the old OpenIGTLinkIF, it doesn’t look like it’s possible.

You could implement a workaround by attaching an observer to the fiducial node and sending the position as a transform message for the time being.

5

I see you’ve already commented on it but for the sake of others, here is the SlicerOpenIGTLink issue on GitHub:

6

Hi,
I have solved putting each fiducial in a new list where there is only that point.
Thank you