Thank you for your reply. Perhaps you can provide some more insight into implementing this command. I am wondering if this command is able to accomplish what I am trying to do. For example, I am using the simple circular tags, 11, 12, 13 to set the reconstruction region, and I would like to use either tag 14 for 10cm, tag 15 for 20cm or tag 16 for 30cm. Basically, that the height is determined by based off which marker is detected. Do you reckon something like this is feasible ?