包含反射、折射和焦散效果的全局光照快速绘制方法

摘要

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 highfrequency 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.%基于分治的思想,提出一种能够交互绘制直接光照、间接光照、反射、折射、焦散等多种效果的全局光照近似计算方法.该方法采用粗粒度的体结构来模拟低频间接光照,利用细粒度的图像对场景进行采样,计算反射、折射和焦散效果；将粗粒度的体采样和细粒度的图像方法相结合,提出了包含多次递归反射、折射的延缓收集缓冲区构建方法、基于体素的双向光照收集方法以及多分辨率自适应光照收集方法.与光子映射方法相比,文中方法更快,针对完全动态的场景绘制速度在10～30帧/s之间；与其他加速单一效果的方法相比,该方法不但可以快速准确地计算间接光照,而且包含了多种镜面效果,绘制效果逼真,显著增强了真实感.