Abstract: With the development of virtual reality (VR) technology, previz has gradually become an indispensable part of the film production. To improve the experience of filmmakers in previz, the utilization of natural multi-modal interaction, combined with 3D real-time rendering engine, has become increasingly important. At present, most of the interactive methods employed in previz are optical motion capture methods, which are expensive, difficult to operate, and poor in portability. This paper presented a human-computer interaction method based on Leap Motion. In addition to obtaining accurate captured data, it greatly reduced cost and the difficulty of operation. Filmmakers can interactively control the trajectory and switch between different motion states of virtual characters through gestures. With the help of motion capture data, filmmakers can directly participate in previz. The verification through previz schemes shows that this method is more natural, friendly, direct and efficient. 

Key words: Leap Motion, previz, human computer interaction, virtual reality, virtual character