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Delta voxel cone tracing

: Franke, Tobias


ISMAR 2014. IEEE International Symposium on Mixed and Augmented Reality : Munich, Germany 10-12 September 2014
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-6184-9
ISBN: 978-1-4799-6185-6
International Symposium on Mixed and Augmented Reality (ISMAR) <13, 2014, Munich>
Fraunhofer IGD ()
mixed realities; relighting; Augmented reality (AR); global illumination; voxel cone tracing; Business Field: Visual decision support; Business Field: Digital society; Research Area: Computer graphics (CG); Research Area: Computer vision (CV); Research Area: Human computer interaction (HCI)

Mixed reality applications which must provide visual coherence between synthetic and real objects need relighting solutions for both: synthetic objects have to match lighting conditions of their real counterparts, while real surfaces need to account for the change in illumination introduced by the presence of an additional synthetic object. In this paper we present a novel relighting solution called Delta Voxel Cone Tracing to compute both direct shadows and first bounce mutual indirect illumination. We introduce a voxelized, pre-filtered representation of the combined real and synthetic surfaces together with the extracted illumination difference due to the augmentation. In a final gathering step this representation is conetraced and superimposed onto both types of surfaces, adding additional light from indirect bounces and synthetic shadows from antiradiance present in the volume. The algorithm computes results at interactive rates, is temporally coherent and to our knowledge provides the first real-time rasterizer solution for mutual diffuse, glossy and perfect specular indirect reflections between synthetic and real surfaces in mixed reality.