Delta Light Propagation Volumes for Mixed Reality
2013 IEEE International Symposium on Mixed and Augmented Reality
Indirect illumination is an important visual cue which has traditionally been neglected in mixed reality applications. We present Delta Light Propagation Volumes, a novel volumetric relighting method for real-time mixed reality applications which allows to simulate the effect of first bounce indirect illumination of synthetic objects onto a real geometry and vice versa. Inspired by Radiance Transfer Fields, we modify Light Propagation Volumes in such a way as to propagate the change in illumination caused by the introduction of a synthetic object into a real scene. This method combines real and virtual light in one representation, provides improved temporal coherence for indirect light compared to previous solutions and implicitly includes smooth shadows.