Muñoz-Pandiella, I.Bosch, C.Mérillou, N.Pueyo, X.Mérillou, SPatow, G.Reinhard Klein and Holly Rushmeier2016-07-182016-07-182016978-3-03868-007-92309-5059https://doi.org/10.2312/mam.20161248https://diglib.eg.org:443/handle/10.2312/mam20161248In this paper, we propose to discuss on one of the main challenges in realistic rendering of urban scenes: changes in appearance over time within a urban context. After studying the previous work on weathering techniques, we have found that there is a lack of estimation for some important environmental parameters (such as sun radiation) that have a wrong impact on weathering phenomena simulation and, thus, on the appearance of virtual objects. We also think that such a problem needs to be addressed on large urban models. Here, we discuss some possible solutions we have studied in our research. These solutions are focused on screen-space techniques, in order to efficiently compute those factors and use them to interactively generate weathering effects.I.3.5 [Computer Graphics]Computational Geometry and Object ModelingPhysically based modelingI.3.7 [Computer Graphics]Three Dimensional Graphics and RealismColorshadingshadowingand texture10.2312/mam.201612485-8