报告时间：2024年10月30日下午14:00
报告地点：浙江大学紫金港校区蒙民伟楼402会议室
报告题目: Microflake distributions and global illumination in sparse voxel octrees.
报告人：Nelson Max教授
主持人：黄劲 教授
Abstract: Scenes in computer animation can have extreme complexity, especially when high resolution objects are placed in the distance and occupy only a few pixels. A useful technique for level of detail in these cases is to use a sparse voxel octree containing both hard surfaces and a participating medium consisting of microflakes. In this talk I will discuss three different methods for approximating the distribution of normals of the microflakes, which is needed to compute extinction, inscattering of attenuated direct illumination, and multiple scattering in the participating medium. Specifically, they are (a) k means approximation with k weighted representatives, (b) expansion in spherical harmonics, and (c) the distribution of the normals of a specific ellipsoid. I will compare their image quality, data size, and computation time. Finally I will explain a method of efficiently computing position-dependent fully anisotropic multiple scattering for global illumination in such octree volumes.
Bio: Professor Max has a PhD in Mathematics from Harvard University, and is a distinguished professor emeritus at the University of California, Davis. His research interests are in the areas of scientific visualization, computer animation, realistic computer graphics rendering, augmented reality, and interactive web visualizations. In visualization he works on molecular graphics, and volume and flow visualization, particularly on irregular finite element meshes. He has rendered realistic lighting effects in clouds, trees, and water waves, and has produced numerous computer animations, shown at the annual ACM SIGGRAPH conferences, and in OMNIMAX at the Fujitu Pavilions at Expo ’85 in Tsukuba Japan, and Expo ’90 in Osaka Japan
