Kinect and metaballs

hi guys! I’m trying to follow movements of more then 3 people with kinect, actually I’m using pipet, then I’m filtering out the floor, then I draw lots of little quads using X and Z (like I was looking from above).

then i do some metaballs (Blobs filter) and contour. This is working more or less, but there is limit on how many mataballs I can draw… how can I modify this limit? or, do you have better way to do all this?