Drawing over architecture

hi all,

i want to be able to project a vvvv renderer over some architecture, and then trace a white line over the architecture… Then with a touchscreen, scribble patterns around those trace lines and then with a screen capture software I want to playback and loop those scribbles…

Im wondering, if i get a touchscreen, is it easy to configure to work with vvvv? Does it just work like a mouse?

In the final projection I dont want to project the trace lines, just the scribbles… So im thinking I can do that by just having a secondary renderer that doesn’t include the trace lines…

In terms of doing the drawings, what would be the best method for that in vvvv?