Differential Progressive Path Tracing for High-Quality Previsualization and Relighting in Augmented Reality

In this paper we present a novel method for real-time highquality previsualization and cinematic relighting. The physically based Path Tracing algorithm is used within an Augmented Reality setup topreview high-quality light transport. A novel differential version of progressive path tracing is proposed, which calculates two global light transport solutions that are required for differential rendering. A real-time pre-visualization framework is presented, which renders the solution with alow number of samples during interaction and allows for progressive quality improvement. If a user requests the high-quality solution of a certainview, the tracking is stopped and the algorithm progressively convergesto an accurate solution. The problem of rendering complex light pathsis solved by using photon mapping. Specular global illumination effectslike caustics can easily be rendered. Our framework utilizes the massiveparallel power of modern GPUs to achieve fast rendering with complexglobal illumination, a depth of field effect, and antialiasing.