philc, from what I get out of the english page the system uses two cameras set to cover the recording area at 90 degrees. The two cameras are input to the software which can then calculate the marker positioning in 3d. There are some quicktime samples to download that show the process. No price that I could find. There are a couple of these things on the market. The results are very good IF you get the camera positioning precise and keep motion towards the middle of the capture area. regards