Programed with last openFrameworks version, it use Theo´s Watson ofxKinect and new ofShade, ofVec3f and other improvements.
Lot of the code it´s based on Kyle McDonald research. Here is sketch of him that I use a lot http://www.openprocessing.org/visuals/?visualID=6753
Some references:
p = control panel
h = calibrate RGB with IR images
UP/DOWN = angle
LEFT/RIGHT = far threashold
This is a simple hack of the famous NUIGroups application used on multiTouch tables.
Camera input it´s replace for Kinect drivers (using Theo Watson´s addon: ofxKinect)
As Theo´s default example you can set the space between distance you want to track. And the you can apply any kind of filter (mous of the obsolet)
Just like the NUI app, you can calibrate the area and the send the position thought TUIO protocol.
In this video I´m using Memo´s MSA Fluid TUIO Demo from processing to show an example
http://github.com/patriciogonzalezvivo/KinectCoreVision