A Realistic Modeling and Real Time Rendering Method of Fruit Decay Based on Interactive Design

This paper presents a generally 3D approach for simulating the decay process in fruits to provide a visual model for the digital design of fruit. A global decay parameter and a decay resistance parameter are used to control the dynamic simulation process of decay for users. The decay resistance parameters are set for every point on the 3D fruit model by an interactive designing method which is similar to traditional drawing tools. The resistance parameters finally form a texture of decay region on the fruit surface. With the resistance parameters, the degree of decay which is used to control the shape and appearance of fruit decay surface, can be compute by tuning the global decay parameters. For the shape of decay region, the exponential function is given for calculating the depression displacement cased by decay. In order to render the wrinkle on the decay region, a noise normal map is used to disturb the normal vector of fruit model. We verified our method by simulating the rotten apple, the result shows that a dynamic and real-time realistic simulation can be obtained using our method which is flexible, fast and general. We believe this approach is suitable for fruit digital design as a visualization model.