filename : Mue17a.pdf entry : article conference : Eurographics Symposium on Rendering (EGSR) 2017 pages : 91--100 year : 2017 month : June title : Practical Path Guiding for Efficient Light-Transport Simulation subtitle : author : Müller, Thomas and Gross, Markus and Novák, Jan booktitle : Computer Graphics Forum ISSN/ISBN : 1467-8659 editor : publisher : publ.place : volume : 36 issue : 4 language : English keywords : ray tracing, global illumination abstract : We present a robust, unbiased technique for intelligent light-path construction in path-tracing algorithms. Inspired by existing path-guiding algorithms, our method learns an approximate representation of the scene's spatio-directional radiance field in an unbiased and iterative manner. To that end, we propose an adaptive spatio-directional hybrid data structure, referred to as SD-tree, for storing and sampling incident radiance. The SD-tree consists of an upper part---a binary tree that partitions the 3D spatial domain of the light field---and a lower part---a quadtree that partitions the 2D directional domain. We further present a principled way to automatically budget training and rendering computations to minimize the variance of the final image. Our method does not require tuning hyperparameters, although we allow limiting the memory footprint of the SD-tree. The aforementioned properties, its ease of implementation, and its stable performance make our method compatible with production environments. We demonstrate the merits of our method on scenes with difficult visibility, detailed geometry, and complex specular-glossy light transport, achieving better performance than previous state-of-the-art algorithms.