ElastImpact: 2.5D Multilevel Instant Impact Using Elasticity on Head-Mounted Displays

Impact is a common effect in both daily life and virtual reality (VR) experiences, e.g., being punched, hit or bumped. Impact force is instantly produced, which is distinct from other force feedback, e.g., push and pull. We propose ElastImpact to provide 2.5D instant impact on a head-mounted display (HMD) for realistic and versatile VR experiences. ElastImpact consists of three impact devices. Each device uses a DC motor to extend an elastic band and block it with a mechanical brake to store the impact power. When releasing the brake, it provides impact instantly. Two impact devices are affixed on both sides of the head and connected with the HMD to provide the normal direction impact toward the face (i.e., 0.5D in z-axis). The other device is connected with a proxy collider and barrel in front of the HMD and rotated by a motor in the tangential plane of the face to provide 2D impact (i.e., xy-plane). By performing a just-noticeable difference (JND) study, we realize users’ impact force perception distinguishability on the heads in the normal direction and tangential plane, separately. Based on the results, we combine normal and tangential normal as 2.5D impact, and performed a VR experience study to verify that the 2.5D impact from ElastImpact significantly enhances realism.