With HTC's Vive Tracker, the VR game "Tornuffalo" named "tornado" and "buffalo" now offers a "full body motion" mode, which is an early attempt of VR game to track the whole body. In this simple action game, players need to avoid the oncoming debris (sometimes buffaloes) and need to crush the crystal to get points. Tornuffalo was originally launched on SteamVR in December 2016, a room-scale VR experience priced at just RMB6. The game can only use the heads-up and motion controllers to try to achieve the feeling of full-body motion. Now with the Vive Tracker (fixed at the waist and feet), the player's body will be more integrated into the game, resulting in More subtle and subtle avoidance, and use your feet to kick open objects. Similar to HTC's own Vive IK motion capture mode and IKinema's Orion animation software, the player needs to fix three Vive Trackers on the body (one on the waist and one on each foot), and then combine the motion controller and head display to achieve 6 Tracking points. With inverse kinematics, the system can generate accurate full-body gestures in real time. For Tornuffalo, this method can achieve more precise avoidance while using more confident techniques to skip low-altitude objects. In addition, players can even kick off oncoming objects with their feet. Tornuffalo's Steam page shows that the current beta version already supports full body motion mode, and the game will soon launch free updates. Developers said that players can use 2 Trackers to play full-body mode (one on each foot), but it is recommended to use three Vive Trackers.