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Issue No.02 - March-April (2012 vol.32)
pp: 44-54
Stéphane Merillou , University of Limoges
Eric Galin , University Lumière Lyon 2
Djamchid Ghazanfarpour , University of Limoges
ABSTRACT
Human-made structures' appearance depends on various aging phenomena, resulting in complex patterns that vary with time and the environment. Handling such complexity is important in computer graphics to improve virtual scenes' realism. Artists often do this work by hand. Their results are typically very good, but at the price of tediousness and a large amount of bibliographical research to place these patterns correctly on damaged objects. One way to tackle this problem is to provide new aging algorithms. A new model addresses salt-based aging, which leads to rich and common changes in appearance and plays an important part in the realism of scenes featuring stone structures and monuments. This model, based on physical behaviors and principles, replaces the simulation of complex physical formulations with ad hoc algorithms. It leads to plausible results, ultimately helping designers create aging patterns on affected objects.
INDEX TERMS
aging and weathering phenomena, salt aging, architectural aging, realistic rendering, computer graphics
CITATION
Nicolas Merillou, Stéphane Merillou, Eric Galin, Djamchid Ghazanfarpour, "Simulating How Salt Decay Ages Buildings", IEEE Computer Graphics and Applications, vol.32, no. 2, pp. 44-54, March-April 2012, doi:10.1109/MCG.2011.107
REFERENCES
1. J. Lu et al., "Context-Aware Textures," ACM Trans. Graphics, vol. 26, no. 1, 2007, article 3.
2. S. Merillou and D. Ghazanfarpour, "A Survey of Aging and Weathering Phenomena in Computer Graphics," Computers and Graphics, vol. 32, no. 2, 2008, pp. 159–174.
3. S.Z. Lewin, "The Mechanism of Masonry Decay through Crystallization," Conservation of Historic Stone Buildings and Monuments, Nat'l Academies Press, 1982.
4. M. Angeli, "Multiscale Study of Stone Decay by Salt Crystallization in Porous Networks," doctoral thesis, Geology Dept., Univ. Cergy-Pontoise, 2007.
5. S. Shahidi, S. Merillou, and D. Ghazanfarpour, "Phenomenological Simulation of Efflorescence in Brick Constructions," Proc. Eurographics 2005 Workshop Natural Phenomena (NPH 05), Eurographics Assoc., 2005, pp. 17–23.
6. C. Rodriguez-Navarro and E. Dohene, "Salt Weathering: Influence of Evaporation Rate, Supersaturation and Crystallization Pattern," Earth Surface Processes and Landforms, vol. 24, no. 3, 1999, pp. 191–209.
7. L. Lefebvre and P. Poulin, "Analysis and Synthesis of Structural Textures," Proc. Int'l Conf. Graphics Interface, Canadian Human-Computer Communications Soc., 2000, pp. 77–86.
8. N. Merillou et al., "Simulating Atmospheric Pollution Weathering on Buildings," Proc. Int'l Central Europe Conf. Computer Graphics, Visualization and Computer Vision (WSCG 10), Eurographics Assoc., 2010, pp. 65–72.
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