基于粒子系统的土壤可视化仿真研究

土壤结构三维可视化将有助于更好地理解土壤结构及其与功能的关系.本文从描述土壤固体颗粒结构入手,基于土壤结构具有明显分形特征,采用粒子系统来模拟土壤颗粒并进而实现土壤结构的三维可视化.设置9种土壤粒子基本形状,将具有农学意义的土壤容重和比重等转化为粒子数量并进行相应初始化,结合特定的运动学方程和碰撞处理方法描述粒子的运动,待粒子运动进入平衡态后,暂停粒子运动就可获得可视化的土壤.对模型进行验证:输入三种不同土壤的参数,生成了具有真实感的土壤三维结构.可视化计算结果表明,计算结果和趋势都与实际相符.本方法初步实现了土壤结构的三维重建,具有一定研究和应用价值.

Soil visual simulation study based on particle system

Three-dimensional visualization of soil structure should help to better understand soil structure and its relationship with the function. Soil solid grain structure was described. Particle system is applied to simulate soil grain and realize visualization because soil structure has the obvious characteristic of fraction. First, nine basic shapes of soil particle were set up. Second, the soil bulk density and proportion were translated into particle quantity and initiated. Third, particles started moving with given kinematics function and collision disposal methods. After a period of time, the particle moving state achieved equilibrium. Finally, the virtual soil was created by pausing movement of particle at that time. To validate this model, three different soil parameters were inputted to create three-dimensional soil structure. The visual computation result and trend agree with actual circumstance approximately. This method primarily implements three-dimensional reconstruction of soil structure, which provides some studying and application values to a certain extent.