Nishizawa, MasahiroYamada, MusoSakai, GokiNakata, TakayukiJorge, Joaquim A.Sakata, Nobuchika2025-11-262025-11-262025978-3-03868-278-31727-530Xhttps://doi.org/10.2312/egve.20251354https://diglib.eg.org/handle/10.2312/egve20251354Volumetric and aerial displays have been pursued as a means to present three-dimensional images viewable from any direction without head-mounted devices or glasses. However, existing approaches often suffer from limitations such as restricted viewing zones, narrow display volumes, or dependence on large screens or mechanically moving components. To address these challenges, we propose a new approach based on computed tomography (CT), which applies CT principles to projector rays visualized in fog. In this method, images are reconstructed in mid-air by superimposing rays projected from multiple angles, eliminating the need for physical projection surfaces. In this paper, we report a preliminary demonstration of this approach. We built a prototype with ten scanning laser projectors arranged in a circular configuration and tested it in a fog-filled environment. The system successfully produced faint yet recognizable two-dimensional aerial images consistent with the intended shapes. This experiment confirms the feasibility of ray-superimposed back-projection in real space, not just in simulation. This preliminary result represents an initial step toward scalable, screenless, and multi-viewable volumetric displays.Attribution 4.0 International LicenseCCS Concepts: Hardware → Displays and imagers; Computing methodologies → Volumetric models; Human-centered computing → Mixed / augmented reality; Displays and imagersHardware → Displays and imagersComputing methodologies → Volumetric modelsHuman centered computing → Mixed / augmented realityDisplays and imagers10.2312/egve.202513545 pages