- 10 July 2015: code available!
- 18 December 2014: slides from our Siggraph Asia 2014 presentation uploaded!
- 19 September 2014: preprint available (see Downloads).
- 18 September 2014: web launched!
Recent advances in ultra-fast imaging have triggered many promising applications in graphics and vision, such as capturing transparent objects, estimating hidden geometry and materials, or visualizing light in motion. There is, however, very little work regarding the effective simulation and analysis of transient light transport, where the speed of light can no longer be considered infinite. We first introduce the transient path integral framework, formally describing light transport in transient state. We then analyze the difficulties arising when considering the light's time-of-flight in the simulation (rendering) of images and videos. We propose a novel density estimation technique that allows reusing sampled paths to reconstruct time-resolved radiance, and devise new sampling strategies that take into account the distribution of radiance along time in participating media. We then efficiently simulate time-resolved phenomena (such as caustic propagation, fluorescence or temporal chromatic dispersion), which can help design future ultra-fast imaging devices using an analysis-by-synthesis approach, as well as to achieve a better understanding of the nature of light transport.
- PDF [4.5 MB]
- Supplementary Material [17.7 MB]
- Main Video [93 MB]
- Slides [PPTX 65 MB] [PDF 2.5 MB]
- ACM Digital Library: [Paper]
- 2015: Relativistic Effects for Time-Resolved Light Transport
- 2013: Femto-Photography: Capturing and Visualizing the Propagation of Light
- 2012: Femto-photography: Visualizing light in motion
We want to thank the reviewers for their insightful comments, and Mubbasir Kapadia for the link to sound rendering papers. This research has been partially funded by the European Commission, 7th Framework Programme, through projects GOLEM and VERVE, the Spanish Ministry of Economy and Competitiveness through project LIGHTSLICE, and project TAMA.