HDR Light Probe Sequence Resampling for Realtime Incident Light Field Rendering
2009 (English)In: Proceedings - SCCG 2009: 25th Spring Conference on Computer Graphics / [ed] Helwig Hauser, New York, USA: ACM New York , 2009, 43-50 p.Conference paper (Refereed)
This paper presents a method for resampling a sequence of high dynamic range light probe images into a representation of Incident Light Field (ILF) illumination which enables realtime rendering. The light probe sequences are captured at varying positions in a real world environment using a high dynamic range video camera pointed at a mirror sphere. The sequences are then resampled to a set of radiance maps in a regular three dimensional grid before projection onto spherical harmonics. The capture locations and amount of samples in the original data make it inconvenient for direct use in rendering and resampling is necessary to produce an efficient data structure. Each light probe represents a large set of incident radiance samples from different directions around the capture location. Under the assumption that the spatial volume in which the capture was performed has no internal occlusion, the radiance samples are projected through the volume along their corresponding direction in order to build a new set of radiance maps at selected locations, in this case a three dimensional grid. The resampled data is projected onto a spherical harmonic basis to allow for realtime lighting of synthetic objects inside the incident light field.
Place, publisher, year, edition, pages
New York, USA: ACM New York , 2009. 43-50 p.
Image Based Lighting, Incident Light Fields, Spherical Harmonics
Computer Vision and Robotics (Autonomous Systems)
IdentifiersURN: urn:nbn:se:liu:diva-18052DOI: 10.1145/1980462.1980474ISBN: 978-1-4503-0769-7OAI: oai:DiVA.org:liu-18052DiVA: diva2:214142
25th Spring Conference on Computer Graphics, SCCG 2009; Budmerice; Slovakia