关键词：物理渲染；筛选；射线追踪
摘 要：Ray tracing allows for physically-accurate renderings of various phenomena, producing a highquality image. Because of its computational complexity, ray tracing is typically reserved for offline rendering, where each image is allowed virtually unlimited time to render. Much work has been done to accelerate ray tracing to enter the interactive domain, requiring each image to be produced in less than a few seconds. Current ray tracers can interactively produce images with only a limited subset of their possible offline effects. My work with Professor Ravi Ramamoorthi and Soham Mehta focuses on physical phenomena that are too computationally expensive to render interactively. We focus on two effects: soft shadows cast by area lights and di?use indirect lighting, but the principles behind our work can be applied to various other phenomena.