I was wondering if there is a free motion capture (ala ping pong balls) that can be used with a webcam or hd cam...
Thanks

I've never come across a free one - not to say it doesn't exist, but I haven't found it.

Close to free - maybe.

Syntheyes at around $400 can do reasonable motion capture. I think you would need 2 to 4 cameras running at once and there are some camera calibration issues. Also - if the cameras use CMOS sensors (almost all recent cams under $20k - $30k except for the new JVC units) instead of CCD there can be other issues that will lead to less than great results.

I don't know of anything less expensive than Syntheyes - might exist, I just haven't heard about it.

thanks for the input. I think there was something out there a couple of years back called cee-gee or something?