ForceCtrl: Hand-Raycasting with User-Defined Pinch Force for Control-Display Gain Application

We present ForceCtrl, a novel 3D hand raycasting technique that enhances pointing precision by adjusting control-display (CD) gain based on user-defined pinch force. We introduce a target-agnostic approach for refining raycasting precision, overcoming limitations in human motor abilities. User-defined pinch force, detected with surface electromyography (sEMG), enables users to easily activate or deactivate CD gain during interaction. We propose three CD gain strategies and compare them through target selection and placement tasks. Our system reduces selection errors, placement jitters, and user workload, especially for distant targets in high-difficulty tasks. These results highlight the effectiveness of applying CD gain to hand raycasting and demonstrate the potential of user-defined pinch force as a robust input modality for precise hand interaction in AR/VR.

Authors: Seo Young Oh, Junghoon Seo, Juyoung Lee, Boram Yoon, Sang Ho Yoon, and Woontack Woo.
Download Paper | DOI