Practical Capture and Reproduction of
Phosphorescent Appearance

Oliver Nalbach1     Hans-Peter Seidel1     Tobias Ritschel2

1 MPI Informatik    2 University College London

Scene with phosphorescent materials rendered in day light (left) and in the dark (right).

Abstract

This paper proposes a pipeline to accurately acquire, efficiently reproduce and intuitively manipulate phosphorescent appearance. In contrast to common appearance models, a model of phosphorescence needs to account for temporal change (decay) and previous illumination (saturation). For reproduction, we propose a rate equation that can be efficiently solved in combination with other illumination in a mixed integro-differential equation system. We describe an acquisition system to measure spectral coefficients of this rate equation for actual materials. Our model is evaluated by comparison to photographs of actual phosphorescent objects. Finally, we propose an artist-friendly interface to control the behavior of phosphorescent materials by specifying spatio-temporal appearance constraints.

Supplemental Video

Materials

Citation

Oliver Nalbach, Hans-Peter Seidel, Tobias Ritschel
Practical Capture and Reproduction of Phosphorescent Appearance
Computer Graphics Forum (Proc. Eurographics 2017)

@article{Nalbach2017a,
	author	= {Oliver Nalbach and Hans-Peter Seidel and Tobias Ritschel},
	title	= {Practical Capture and Reproduction of Phosphorescent Appearance},
	journal	= {Computer Graphics Forum (Proc. Eurographics 2017)},
	year	= {2017},
	volume	= {36},
	number	= {2}
 }

Acknowledgements

We would like to thank Tobias Bertel and Dushyant Mehta for discussions and help with carrying out measurements. Furthermore, we thank Bernhard Reinert, Michael Wessely, Klaus Hildebrandt and Tim Weyrich for proof reading and Heike Dobicki for providing us with pieces of equipment. The moon scene in Fig. 10 was contributed by Elena Arabadzhiyska. Two objects of Fig. 1 are CC Zero objects from BlendSwap: the fire extinguisher by user Bastable and the mask by YellowPanda. The running elephant sequence in Fig. 12 is courtesy of Bob Sumner. Finally, we are grateful for the helpful suggestions from people involved in the reviewing process of this paper.