Abstract
Weathering affects urban scenes and forms complex patterns that vary with time, environment, and the surface of architectures such as buildings. This causes dramatic changes in the appearance. Thus, it is very important to consider weathering effects in the rendering process for virtual cities. In previous methods,artists have represented weathering effects by hand; however, it takes huge amount of time. Therefore, in recent years, many works have been proposed to generate weathering effects with simplified simulations. In this paper, we propose an image-based method to generate complex patterns caused by rain drops,which represents the aging effect by combining multiple layers representing weathering effects, and also represents the moss generated according to the amount of water attached on the wall.
