Does Unity provide a means to determine the time since the last user interaction?

Actually thinking about it mouse movement is pretty irrelevant as you have to click to begin dragging ;) Its straightforward enough to roll my own, trouble is I have several guitextures and colliders that all re-act to mousedown/up events, plus some generic mouseinput checks in update, so that means routing a callback to some centralised object to track input and update the timer. Was just hoping i'd missed something in the docs, since obviously Unity could easily track this itself. thx

Doh, of course as you say a single component script checking for input.Get$$anonymous$$ouseButton() and input.anykey in update() should work just as well and would be much cleaner.

Lots of things that Unity "could" do are not actually included with the editor. I'm not sure why, but my guess is that they want you to code it yourself, but only if you need it. $$anonymous$$eep It Simple, Stupid. :P - http://en.wikipedia.org/wiki/$$anonymous$$eep_it_simple_stupid

Only problem of course is i'm polling mouse input every frame now, but thats not too bad in this case. Whilst I can understand you wouldn't want to put the kitchen sink into Unity, this is pretty basic functionality that should be simple to have, since Unity itself is obviously detecting interaction and routing it to scripts.

@Noisecrime Lots of things in Unity that you would expect to be there "because it would be easy", are not included for the reason I said earlier, and that was because they didn't want to include something unless it was really needed by a lot of people, and couldn't be easily scripted. This property can be very easily scripted with little to no performance impact (if done correctly), so there was no need to add it into Unity, since you can just code it yourself. You'll find lots of "do-it-yourself" scenarios like this one when using Unity. :P