Research On Technology Of Waterfall Simulation Based On Particle System

Simulation of natural scenery has always been a hot topic in the field of virtual reality technology research.The common natural scenery,such as explosion,smoke,clouds,fountains,snow,waves and other natural scenery,mostly has irregular shape,its dynamic and random are quite strong.If the traditional modeling method is used to simulate natural scene,it will be more difficult.Particle system technology is one of the most effective methods of the modeling of the natural scene.In this paper,we select the waterfall that is a special scenery as the object of study.By analyzing the shape structure and the motion characteristics of the waterfall,the physical model is abstracted.By using particle system technology and collision detection technology,the waterfall model based on particle system is built.Fog effects and sound effects are added to increase the immersion of the scene.First of all,the time overhead of the drawing phase of the waterfall is a big problem to be solved.In the course of the motion of the waterfall,the motion path of a waterfall is traced.The motion path in a period of time is used as the basic drawing unit to draw the waterfall particles,and the path tracking mode is proposed.Secondly,the collision detection and processing optimization problems in the previous waterfall model will be solved.According to the space and time position of waterfall and the characteristics of static obstacles,the area of obstacles those are not likely to collide are excluded to achieve the goal of simplifying the tree structure,an improved hierarchical bounding box tree algorithm is proposed.Then combined with the characteristics of the waterfall model,whether the projection of waterfall particles and static obstacles is registration to exclude a large number of waterfall particles those will not collide in advance,particle classification tree algorithm is proposed.Finally,combined with the proposed waterfall drawing method and collision detection optimization algorithm,in the visual C++ platform,the real time simulation of waterfall is realized.