Salman Shahidi


Human made buildings and constructions are very dependent upon various weathering phenomena, resulting in complex appearances and patterns that vary with time and environment. Handling such complexity is important in computer graphics in order to improve the realism of images. This difficult work is usually done by hand by designers and can lead to non-plausible results. Another way to tackle this problem is to provide new aging algorithms. Among a large number of weathering, salt weathering results in important visual changes affecting widely used materials: bricks and mortars. In this paper, we present a method to generate the texture of deformed and eroded masonry face by efflorescence. To avoid complex and unintuitive formulations while keeping plausible results, we chose a physically-inspired model. Moreover, in order to keep an important artistic control, it is possible for the user to create weathered textures in preferential masonry zones, leading to a great variety of different patterns. First, we synthesize a masonry (brick/mortar) solid texture. Next, we add the effects of efflorescence and sub-florescence using a specific algorithm accounting for regular crystallized or eroded surface masonry by displacement mapping. In addition, to model very strong weathering effects on building walls, we apply a simple geometry modification method to modify the surface before its rendering.


  1. Ahl, J. (2003). Salt diffusion in brick structures. In Journal of Materials Science, volume 38, pages 2055-2061.
  2. Becket, W. and Badler, N. (1990). Imperfection for realistic image synthesis. In Journal of Visualization and Computer Animation, volume 1, pages 26-32.
  3. Benavente, D., Garcia, M., Garcia-Guinea, J., SanchezMoral, S., and Ordonez, S. (2004). Role of pore structure in salt crystallisation in unsaturated porous stone. In Journal of Crystal Growth, volume 260, pages 532- 544.
  4. Blinn, J. F. (1982). Light reflection functions for simulation of clouds and dusty surfaces. In Computer Graphics, volume 3, pages 21-29.
  5. Bosch, C., Merillou, S., Pueyo, X., and Ghazanfarpour, D. (2004). A physically-based model for rendering realistic scratches. In Computer Graphics Forum, volume 23, pages 361-370.
  6. Bucea, L., Khatri, R., and Sirivivatnanon, V. (2005). Chemical and physical attack of salts on concrete. In Proceedings Urban Salt 2005 Conference.
  7. Correns, C. (1949). Growth and dissolution of crystals under linear pressure. In Discussions of the Faraday Society, volume 5, pages 267-71.
  8. Cutler, B., Dorsey, J., McMillan, L., Muller, M., and Jagnow, R. (2002). A procedural approach to authoring solid models. In ACM Transaction on Graphics (TOG), volume 21, pages 302-311.
  9. Desbenoit, B., Galin, E., and Akkouche, S. (2004). Simulating and modeling lichen growth. In Computer Graphics Forum, volume 23, pages 361-370.
  10. Doggett, M. and Hirche, J. (2000). Adaptive view dependent tessellation of displacement maps. In SIGGRAPH/Eurographics Workshop on Graphics Hardware, pages 59-66.
  11. Dorsey, J., Edelman, A., Jensen, H., Legakis, J., and Pedersen, H. (1999). Modeling and rendering of weathered stone. In ACM SIGGRAPH, pages 225-234.
  12. Dorsey, J. and Hanrahan, P. (1996). Flow and changes in appearance. In ACM SIGGRAPH, pages 411-420.
  13. Hees, R. and Brocken, H. (2004). Damage development to treated brick masonry in a long-term salt crystallisation test. In Construction and Building Materials, volume 18, pages 331-338.
  14. Hsu, S. and Wong, T. (1995). Simulating dust accumulation. In IEEE Computer Graphics and Applications, volume 15, pages 18-22.
  15. Huinink, H., Pel, L., and Michels, M. (2002). How ions distribute in a drying porous medium-a simple model. In Phys Fluids, volume 14, pages 1389 -1395.
  16. Lu, J., Georghiades, A., Glaser, A., Wu, H., Wei, L.- Y., Guo, B., Dorsey, J., and Rushmeier, H. (2007). Context-aware textures. In ACM Trans. Graph., volume 26, pages 167-174.
  17. Matsuo, T. and Tanaka, K. (2004). Mechanism of efflorescence on historical brick masonry buildings reinforced with concrete. In Proceedings of 10th International Conference on Durability of Building Materials and Components, pages 1-8.
  18. Merillou, N., Merillou, S., Ghazanfarpour, D., Dischler, J., and Galin, E. (2010). Simulating atmospheric pollution weathering on buildings. In WSCG, pages 65-72.
  19. Merillou, S., Dischler, J.-M., and Ghazanfarpour, D. (2001). Corrosion: Simulating and rendering. In Graphics Interface, pages 167-174.
  20. Merillou, S. and Ghazanfarpour, D. (2008). A survey of aging and weathering phenomena in computer graphics. In Computer Graphics, volume 32, pages 159-174.
  21. Miller, G. (1994). Efficient algorithms for local and global accessibility shading. In ACM SIGGRAPH, volume 21, pages 319-326.
  22. Nehdi, M. and Hayek, M. (2005). Behavior of blended cement mortars exposed to sulfate solutions cycling in relative humidity. In Cement and Concrete Research, volume 35, pages 731-742.
  23. Paquette, E., Poulin, P., and Drettakis, G. (2001). Surface aging by impacts. In Graphics Interface, pages 175- 182.
  24. Paquette, E., Poulin, P., and Drettakis, G. (2002). The simulation of paint cracking and peeling. In Graphics Interface, pages 59-68.
  25. Peachey, D. R. (1985). Solid texturing of complex surface. In Computer Graphics, pages 279-286.
  26. Pel, L., Huinink, H., and K.Kopinga (2003). Salt transport and crystallization in porous building materials. In Magnetic Resonance Imaging, volume 21, pages 317- 320.
  27. Pel, L., Huinink, H., Kopinga, K., van Hees, R., and Adan, O. (2004). Efflorescence pathway diagram: understanding salt weathering. In Construction and Building Materials, volume 18, pages 309-313.
  28. Pel, L., Kopinga, K., Bertram, G., and Lang, G. (1995). Water absorption in fired-clay brick observed by nmr scanning. In J. Phys. D: Appl. Phys., volume 28, pages 675-680.
  29. Perlin, K. (1984). A unified texture/reflectance model. In SIGGRAPH 84 Advanced Image Synthesis course notes.
  30. Perlin, K. (1985). An image synthesizer. In Computer Graphics, volume 19, pages 287-296.
  31. Shahidi, S., Merillou, S., and Ghaznanfarpour, D. (2005). Phenomenological simulation of efflorescence in brick constructions. In Proceedings of Eurographics on Natural Phenomena, volume aug, pages 17-23.
  32. Wong, T., Ng, W. Y., and Heng, P. A. (1997). A geometry dependent texture generation framework for simulating surface imperfections. In Proceedings of Eurographics Workshop on Rendering, pages 139-150.

Paper Citation

in Harvard Style

Shahidi S. (2012). SALT WEATHERING OF BRICK WALLS . In Proceedings of the International Conference on Computer Graphics Theory and Applications and International Conference on Information Visualization Theory and Applications - Volume 1: GRAPP, (VISIGRAPP 2012) ISBN 978-989-8565-02-0, pages 7-15. DOI: 10.5220/0003807600070015

in Bibtex Style

author={Salman Shahidi},
booktitle={Proceedings of the International Conference on Computer Graphics Theory and Applications and International Conference on Information Visualization Theory and Applications - Volume 1: GRAPP, (VISIGRAPP 2012)},

in EndNote Style

JO - Proceedings of the International Conference on Computer Graphics Theory and Applications and International Conference on Information Visualization Theory and Applications - Volume 1: GRAPP, (VISIGRAPP 2012)
SN - 978-989-8565-02-0
AU - Shahidi S.
PY - 2012
SP - 7
EP - 15
DO - 10.5220/0003807600070015