How to use a touch swipe to draw in object e.g. a spline mesh

Hi Folks,

Basically I am looking help to create a gesture system so that between the start touch and the end touch a dynamically created object will appear spanning between the two points. I was thinking a spline mesh might be the best approach but if anyone has an easier/better method could you please let me know. The created object must be able to have collision so game objects can e.g. fall on to them.

Thanks for any help.