Spatial visualization of WBGT using CG light source control considering solar radiation scattering

Abstract

In recent years, the number of heatstroke patients has been increasing in Japan, and raising public awareness has become important. The heat index information disseminated by the Ministry of the Environment represents discrete representative values for each city, and there are limited opportunities to understand detailed heatstroke risks in outdoor working environments across different areas. Previous studies have visualized the heat index in a heatmap format by rendering shadows cast by objects using 3D urban data and solar trajectories; however, their applications have been limited to clear weather conditions. This study focuses on the fact that heatstroke risks are not necessarily high only under sunny conditions. It proposes a method that enables heat index estimation under various weather conditions by estimating the direct and diffuse components of global solar radiation from limited meteorological information and dynamically controlling the intensity of light sources within a game engine.