应用于全局照明的光线追踪:性能优化与特效实现(英文)

Ray tracing for global illumination:Optimization and special effects

全局照明在电影工业、飞机和汽车制造业有着广泛的应用,而光线追踪对于全局照明至关重要.光线追踪通过追踪光线到图像平面在二维屏幕上呈现三维图像,是计算机图形学里的1种基本渲染技术,但是实现光线追踪计算量非常大,尤其是当要追踪上百万条光线时.本文探讨了利用反射优化、超高速缓存、迭代追踪、多核/分散式网络等技术对基于KD-树的光线追踪的优化.用分布式光线追踪技术实现了抗锯齿、景深、软阴影等三维特效,最后还实现了基于GPU的光线追踪并应用于反射、折射、景深、运动模糊等特效.

Ray tracing is critical for global illumination, which is widely used film production, airplane and car design process. Ray tracing is a rendering technique that traces the path of light through pixels into an image plane. It is one of the fundamental technique used in computer graphics, however it is very costly to trace a large number of rays. In this article, a few techniques （including bounce management, cache, iteration, multi-core/network distribution） have been applied to improve the performance of the ray tracer based on KD-tree. Also, depth of field, antialiasing and soft shadows has been implemented on the distributed ray tracer. Finally, ray tracer was implemented on GPU and was used to create some advanced visual effects.