HandDepthCursor

Also known as HDC

Bare-hand RayCursor: point with one hand and pinch to select, while the other hand moves a depth cursor along the ray with simple point-forward / thumb-back gestures.

How it works

A ray is cast from the dominant hand and a pinch confirms. The non-dominant hand moves a cursor along the ray: pointing the index finger forward pushes it deeper, pointing the thumb backward brings it closer. Objects behind the cursor become transparent, as in Alpha Cursor, to help with occluded targets. It was fast and accurate, especially at lower density, but some users found the cursor too slow and it does not disambiguate sideways. Evaluated (N=18, Meta Quest 2 hand tracking) against MultiFingerBubble with 10 cm spheres in a 1 m cube 0.8 m in front of the user, at two densities.

Papers

Rongkai Shi, Jialin Zhang, Yong Yue, Lingyun Yu, Hai-Ning Liang (2023). Exploration of Bare-Hand Mid-Air Pointing Selection Techniques for Dense Virtual Reality Environments. Extended Abstracts of the 2023 CHI Conference on Human Factors in Computing Systems (CHI EA '23) doi:10.1145/3544549.3585615