I came across this video made by people at Dentsu London and BERG. It's this innovative technique that uses an iPad to light paint single photographs which are then used to create stop frame animation. They use software to create a 3D image and then take what they call a virtual cat scan of the 3D image. They replay that image on the iPad and then drag the iPad in one direction which extrudes the single 3D animated frame as light in the photograph. I'm probably not explaining it as well as they do so definitely check it out.