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The complexity of offline and real–time rendering of global illumination effects is a vast field of research. Covering the complexity of dynamic open–world environments with changing light conditions and moving objects is challenging in real–time rendering. Especially the quality of light properties needs to be physically correct and sufficiently fast even if the light and environment conditions are changing. In this paper, we present a fast global illumination approach suitable to achieve indirect lighting using high–resolution reflective shadow maps in real time. Based on LightSkin, we present an enhancement applying bidirectional shadow maps to improve the quality of shadows and global illumination effects in open–world environments. A novel combination of accumulating virtual area lights from the reflective shadow map with an indirect light representation using LightSkin’s proxy light sources shows a significant improvement. In an urban scene typical for open–world environments, the proposed approach is up to approx. 12 times faster than the original LightSkin approach. This makes our novel approach suitable for high–quality indoor as well as outdoor global

A Real–time Global Illumination Approach for High Resolution Reflective Shadow Maps in Open World Scenes