Need help with controlling lights in arduino + processing + kinect (more details in post)

[Filip Bengtegård Book]

Hi guys, I have an issue, I'm trying to replicate what P&A Lab did with FreeHandLight, look at link below to get an idea of how it works.

freehandlight

I've got the basics to work but I'm having a real hard time getting my hand motion to work with fixed spaces with a circle like in the video, controlling the lights accordingly. I have arduino communicating to processing and I can get lights turned on through kinect but not exactly as he does in the video. Does anyone have an idea how it's being done?

I feel there is serious documentation issues with this library and I wished I could learn more about this library :(. Still super thankful that it exists though.