Research On The Visual Simulation Of Tree Motion In Wind

With the development of virtual reality and computer animation, and the demands in game developing, the simulation of tree swaying becomes a hot point of research. So far, many research works have focused on trees modeling and trees'motion simulation in the wind. However, less work has been done in the representation of branch breaking and flying under the strong wind. In this thesis, the focus is simulating the motion of tree under different wind force.Tree modeling is the foundation of tree simulation, and wind model plays an important role in simulating the tree waving in the wind. In this paper, a proper tree model is adopted, and a wind model is built based on the noise technology and kinetics by analyzing currently available tree models and wind models. On the basis of the tree model and the wind model,the force of branch and leaf in the breeze is analyzed, and their motion models under the wind are built. Based on physical and stochastic approaches, the movement of the tree in the breeze is obtained; To the question of visual simulation of tree motion under strong wind, the mechanisms for leaf falling and branch breaking are discussed, and the motion models for falling leaf and breaking branch are built. Effective collision detection algorithms are designed to deal with the collision problems during the broken branch's falling course. On this basis, visual simulation method for leaf falling and branch breaking is designed based on physical and stochastic approaches.A tree swaying system is developed with VC++6.0 and OpenGL. In this system, different simulation results can be obtained by adjusting the parameters. Experiments show that the simulation results are effective and realistic.