Research On The Visual Simulation Of Tree Motion In Wind And Rain

Both tree motion and rainfall are common natural phenomena. With the dramaticdevelopment of computer graphics，tree motion and rainfall have a wide range of applicationin Games, Film and Television, Advertising, Virtual Reality,ect. Whether We could generatethe tree motion and rain effectively and in the time is in a direct line to the sense of reality andimmersion in virtual scenes.Therefore,in this article we make the research on the visualsimulation of tree motion in wind and rain.The whole research includes three parts as follows:Firstly,study the simulation method of rainfall.Model a proper raindrop particle byanalyzing the reaiizing principie of particie system and the action of raindropsparticles;Improve the utilization rate of raindrops particles by generating the raindrop particlesin polar coordinates;Realistically simulate the movement of raindrops particles by precisegeometric calculations for the wind’s influence to the raindrops particles;Render the raindropby texture mapping in OpenGL.The results show that using this method makes the simulationof rain inatural and high in real-time,which guarantees its practical values.Secondly,discuss the implement methods of the interaction between the raindrop andthe leaf based on the anlysis for the action of raindrop on leaf surfaces.produce the shape ofraindrop on leaf surfaces by the distortion of the shapes for the raindrop specimens; simplifythe flow of the raindrop on the leaf surfaces and come up with an method, Texture substitution,to render the flowing of raindrop;Implement the static raindrop and the raindrop flow alongthe leaf vein according the methods we proposed. Experiments show that this method ispracticable and simple and more realistic. the whole implementation ofFinally, combine the Visual Simulation of Tree Motion in Wind and Rainfall to achievethe Visual Simulation of Tree Motion in Wind and Rain. add the rain to the three-dimensionalscene Which have finished about tree movement in wind and determine the lifecycle of raindrops and the position which it collide with the leaf based on the method we haveproposed;give the life cycle to the raindrops which hit the leaves, also change the texture ofleaves which raindrops hit;enrich the whole three-dimensional scene by adding sound and fog.The final result proves the high fidelity the three-dimensional scene.Implement the simulation of tree motion in wind and rian by VC++6.0and OpenGL.Experiments show that the method is effective, and the simulation result is realistic.