基于三维粒子系统的雪灾模拟与实时绘制方法

摘要

利用遥感影像反演积雪的范围与雪深是当前的主流方法之一,但是由于卫星影像获取的时效性约束,存在难以表示积雪动态信息、模型通用性弱、对遥感资料质量依赖程度高等问题.三维粒子系统作为一种优秀的不规则模糊物体模拟方法,可以大大提高自然现象三维场景的真实感.本文提出了一种基于三维例子系统的雪灾模拟与实时绘制方法,将降雪的物理属性及几何属性转化为雪粒子属性,并以物理引擎为基础,建立基于三维粒子系统的积雪模型和融雪模型,模拟降雪过程并计算积雪范围和积雪深度,真实再现雪灾场景和发展趋势,方法简单、可操作且约束较少.实验表明,该方法的模拟结果与实际灾情具有较强的一致性,算法具有可靠性,并能再现三维雪灾场景,具有实时性和逼真性.%Remote sensing image retrieval is one of the most mainstream methods to obtain snow information.Due to the time-resolved constraints of satellite images,it is difficult to show the dynamic change of the snow information.Also,there is a great limitation on the model versatility and the accuracy highly depends on the image quality.Three-dimensional particle system is a good simulation method for irregular fuzzy object,which can greatly improve the realism of the three-dimensional scene of natural phenomena.The snowstorm simulation and real-time rendering method based on three-dimensional particle system transfers the physical and geometric properties of snowfall into the properties of the snow particles,and establishes snow accumulation and snowmelt model based on the physics engine to simulate the snowfall process and calculate the scope and depth of snow.The method is simple operable and with little constrains.The typical case of Qinghai snowstorm suggests that the method acquires good accuracy and reliability of the simulation and is capable of reproducing real-time three-dimensional snow scene.