[layer8]

What would be nice is a version that can be used to paint on the screen with your fingers, such that the lines are visible on a remotely shared screen. The use-case is marking up/highlighting on a normal desktop monitor (i.e. non-touch) while screen-sharing, which is awkward using a mouse or touchpad (think circling stuff in source code and documents, drawing arrows etc.). That would mean (a) a camera from behind (facing the screen), so that the fingers can touch (or almost touch) the screen (i.e. be co-located to the screen contents you want to markup), and (b) native integration, so that the painting is done on a transparent always-on-top OS window (so that it's picked up by the screen-sharing software); or just as a native pointing device, since such on-screen painting/diagramming software already exists.

[b-3-n]

Thank you for sharing this creative idea. "so that the fingers can touch (or almost touch) the screen" I think this is a big advantage of this approach since you can only achieve this with the back facing camera. On the flip side, with a back facing camera you either have to place the camera in between yourself and the screen which might be awkward or you have to ensure a placement of the camera behind you that isn't prone to occlusions (e.g. your head or chair might occlude your hands from the cameras point of view). The latter might also make calibration more difficult or impact precision since you might have to mount the camera with some elevation causing a less optimal camera angle.