Abstract

Conducting real-time wireless propagation simulation in interactive 3D environments is computationally demanding , and this challenge becomes more critical in Virtual Reality (VR), where stable and high frame rates are required for usability and comfort. This paper presents VRadioSim, a GPU-based wireless propagation simulator prototype that supports real-time visualisation of multipath rays and received-signal heatmaps in desktop and tethered VR modes. The prototype loads 3D scenes from GLB models and enables interactive placement of transmitter and receiver entities, visualisation of signal accumulation across scene surfaces, and point-based querying of received power values. A preliminary evaluation across varying scene complexities and ray counts indicates that the desktop version remains consistently interactive, and that tethered VR is currently most practical for lower complexity scenes. Signal sampling measurements show that received-power estimates are mostly consistent across different geometrical scene representations, suggesting stability of the current GPU-based propagation implementation. Overall, the findings demonstrate the practical feasibility of prototype for interactive desktop analysis and provide an initial basis for further optimisation and validation in immersive VR settings.