| Global illumination is important to enhance the authenticity of the scenes in the virtual world. Offline rendering of Global illumination has been developed very mature. In recent years, interactive global illumination is also rapidly developing, especially in the field of game. At first, people focused on the development of interactive global illumination for static scenes. Now they begin to pay attention to interactive global illumination for fully dynamic scenes. This makes pre-computation infeasible and increases the difficulty of interactive global illumination. Firstly this paper will introduces a new technique for approximating global illumination in fully dynamic scenes for Cryengine3. It called light propagation volume (LPV). We also add handling glossy surfaces during propagation and shading of LPV.LPV is one of the most advanced techniques for Global illumination in fully dynamic scenes for real-time applications. This method produces plausible results in diffuse scenes, but it removes much of the interesting illumination in scenes with a substantial proportion of glossy materials. Therefore, this paper made the following improvements of LPV algorithm:1. First this paper Summarizes and extends the LPV algorithm. We eliminate the limitation on glossy reflectance by modifying the radiance propagation scheme to include ray-tracing during propagation. The new method lifts the rendering results of glossy scenes.2. In order to produce more realistic images of glossy scenes, we developed a new photon map algorithm based on LPV. We use LPV for the rendering of diffuse scenes instead of the global photon map. We also store the caustics in the LPV instead of the caustics photon map. At last we render caustics for fully dynamic scenes where no precomputation is feasible with this photon map algorithm. |
