Speaker: Hendrik Lensch (MPI, Germany)
The appearance of real-world objects depends on the incident illumination, on the 3D geometry of the object, and on the reflection properties of the object's surfaces. Reflectance fields capture the resulting global light transport in such a way that the object can be relit in arbitrary virtual environments faithfully reproducing the appearance of the original. In this talk I will present an overview about our current work on acquiring and processing reflectance fields. One part will cover acquisition techniques that are able to measure the global light transport within a scene on a ray-to-ray basis allowing for capturing and reproducing effects such as subsurface scattering, refractions and caustics. One remaining problem is that reflectance fields are typically acquired only for a discrete set of incident light directions. A rotation in the incident illumination is likely to produce artifacts due to this coarse sampling. In the second part I therefore will address the problem of upsampling reflectance fields in the light domain allowing for smoothly moving shadows and highlights when light sources move around the scene.