Tang, HaoyuGao, FanchengChoo, Kenny Tsu WeiBickel, BerndSong, PengChristie, MarcHan, Ping-HsuanLin, Shih-SyunPietroni, NicoSchneider, TeseoTsai, Hsin-RueyWang, Yu-ShuenZhang, Eugene2025-10-072025-10-072025978-3-03868-295-0https://doi.org/10.2312/pg.20251299https://diglib.eg.org/handle/10.2312/pg20251299Virtual Reality (VR) offers a promising platform for modeling man-made shapes by enabling immersive, hands-on interaction with these 3D shapes. Existing VR tools require either a complex user interface or a post-processing to model fabricable man-made shapes. In this paper, we present a VR tool that enables general users to interactively model man-made shapes for personalized fabrication, simply by using four common hand gestures as the interaction input. This is achieved by proposing an approach that models complex man-made shapes using a small set of geometric operations, and then designing a user interface that intuitively maps four common hand gestures to these operations. In our shape modeling approach, each shape part is modeled as a generalized cylinder with a specific shape type and iteratively assembled in a structure-aware manner to form a fabricable and usable man-made shape. In our user interface, each hand gesture is associated with a specific kind of interaction tasks and is intelligently utilized for performing the small set of operations to create, edit, and assemble generalized cylinders. A user study was conducted to demonstrate that our VR tool allows general users to effectively and creatively model a variety of man-made shapes, some of which have been 3D printed to validate their fabricability and usability.Attribution 4.0 International LicenseCCS Concepts: Computing methodologies → Modeling and simulation; Human-centered computing → Interaction designComputing methodologies → Modeling and simulationHuman centered computing → Interaction design10.2312/pg.2025129911 pages