Fast Global Illumination Rendering with Reflection,Refraction and Caustic Effects

This paper presents a global illumination rendering method that renders direct and indirect lighting,reflection,refraction and caustic effects simultaneously and fast.In this method,coarse voxels are used to compute low-frequency indirect lighting while fine images are used to simulate high-frequency reflection,refraction and caustic effects.Combining the sampling of the coarse voxels and the fine images,three techniques,including the generation of a deferred gathering buffer for reflective/refractive samples,a voxel-based bidirectional illumination and an adaptive multi-resolution gathering,are introduced in rendering.Compared with photon mapping and other GPU-accelerated rendering algorithms,the method in this paper simulates multiple effects with high image quality faster.For fully dynamic scenes,the rendering speed is between 10 and 30 frames per second.