Hi, I just got the whiteboard up and running. I've noticed one problem though. First, why do we need to select 4 points? A plane can be defined using 3 points. I noticed though, that if one of the three points is way off, it throws the calibration way off. Also, I noticed that if I was not very exact when selecting the calibration points, the calibration was not very good. Why not allow user (say 3-15) setting the number of points to calibrate with and throwing out the really strange results and averaging in the good results? That way users can increase the accuracy of the calibration.