While 3D Slicer - using SlicerIGT/Plus - have been supporting real-time position tracking using high-end devices (optical trackers, electromagnetic trackers, surgical navigation system, etc), there has been no ultra-low-cost tracking solution available - until now.
With latest version of Plus toolkit you can connect any webcam, print your own markers, and start tracking objects - and show them in real-time in 3D Slicer.
Many thanks to Mark Asselin at PerkLab for adding this feature!
While the tracking is already reasonable accurate to be suitable for certain applications, we are implementing further improvements during the next couple of months.
See more details of how to set it up in comments of the YouTube video.