应用于全局照明的光线追踪：性能优化与特效实现

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 for global illumination:Optimization and special effects

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.