A 3D short film produced by Cameron Pace Group is shown on a screen at a 3D film forum in Tianjin Polytechnic University, north China's Tianjin Municipality, Aug. 7, 2012. Famous director James Cameron and Vince Pace, a master of 3D film technology, attended a 3D film forum held in Tianjing University of Technology on Tuesday. (Xinhua/Zhang Chaoqun)