Using Curvature Analysis Method to Simulate the Appearance of 3D Models Washed by the Rain

3D model blemishes simulation has always been a hot issue in the research of photo-realistic rendering. In this paper, we propose a method to simulate the appearances of the 3D models washed by the rain. Firstly, we defines the exposure degree of the 3D models in the natural environment and the contamination degree of the appearances of the 3D models influenced by the surface normal and the direction of the pollution sources. And then we simulate the phenomenon of dust accumulation on the model appearance. Thirdly, the mean curvature and Gaussian curvature are analyzed to determine the convex and concave areas. Finally, we remove the stains in the convex region and render the stains in the concave area to simulate the appearance of 3D models washed by the rain. We apply our method to more 3D models. Compared with others methods, ours is more practical, simpler and has a stronger sense of reality.