take a look at the first 2 min of [https://www.youtube.com/watch?v=lMe9ANeg8c8
I am looking at doing something like this using in VVVV
I have the green covered Muilty Touch plasma, the Green studio and the tec to do the keying ect.
What i want to do using VVVV in generate the two feeds one for the plasma that can be interacted with and one for the key background.
what i am trying to get my head round is how to have one render that is just the interactive bit in the middle then a second render that is the bigger image so the plasma is just showing a crop of the whole render.
i hope this makes sence