Visualization And Simulation Of The Interactive Process Between Plant And Raindrops Based On Physical Laws

In recent years, simulation and real-time rendering of natural scenery has been one of the most challenging problems in these fields such as computer graphics, agriculture, forestry and ecology. Realistically and effectively simulate the interactions between the external environment and canopy has an important guiding significance and pratical value in fields of plant growth, landscape design, environment prediction and visualization, the rendering of3D game and virtual scenes, etc. At present, the researches of the interaction between plant and environment are mainly focus on the visual simulation of the interaction between plant and wind. However, the models those simulating the interaction between plant and raindrops are mainly two-dimensional models while3D models are rarely reported.In this paper, we visually simulated and modeled the interactive process between plant and raindrops based on the technology of computer graphic. The main works are given as follows:1. An algorithm to visually simulate splashing effects of raindrops under different rainfall conditions based on the physical laws and hardware acceleration was proposed. A rain model was established based on the particle system at first and then the falling and splashing processes of the raindrops were analyzed with considering the resistance effects of wind and air. The paths of raindrops’propagation in the splashing process were simulated based on the statistical knowledge and distribution functions.2. An algorithm to simulate the interaction between plant and raindrops based on physical process was proposed. Firstly, raindrop’s behaviors were estimated according to the value of its kinetic energy whether it would adhere, bounce, splash, merge, flow or not. Secondly, considering the influence of gravitational field to raindrop’s deformation, the interactive behaviors and deformations of raindrops based on metaball method were simulated. Thirdly, a branch model based on the discrete elastic rod model was proposed. Finally, an algorithm based on parametric L-system was put forward to simulate the vibration of the branch under the influence of the external force and its recovery process when the forces disappeared.3. A system was designed and implemented to simulate the interaction between plant and raindrops. The real-time system was realized by using C++programming language, OpenGL graphic rendering engine and MFC framework.In this paper, we have done some basic researches in the field of interactions between plant and raindrops, proposed relevant algorithms and models, and also developed a visualization system. Our approach can not only provide a new method for simulating the interaction between plant and raindrops, but also would make some references for researchers to study the diffusion of spray and disease in the canopy. Therefore, our study has an important theoretical significance and application value.