I've succeeded at getting single point data from the Kinect in to control it from Daniel Shiffman's avgpointtracking implementation, and have had a lot of fun learning about processing by pulling this all apart.

My question is this:

I'd like to alter the code in MSAFluid such that when the color drawing is finished, instead of fading to black it fades to a transparent background.  

I've just started poking around in the code for it, and I will eventually figure it out.  However, I feel like a beginner tracking a chess master's game.  A lot of it is way beyond me at this point!  I can see where the colors get assigned, but I'm not certain how to alter/add functions so that they affect transparency as well.

Is anyone familiar enough with this to give me pointers?

Thank you in advance