摘要
为真实地模拟草在风中摇曳的动态效果,从结构动力学角度将风场视为具有时间和空间相关性的随机过程,利用线性自回归过滤器的方法生成给定条件的风速矢量场,进而运用动力学中有限元分析的方法实时计算风力作用下草的不同部分的受力和形变。在上述基础上,采用基于L系统和基于图像的表示方法对近处的草模型进行参数化建模,并用星形的结构建立远处草体的模型,以便加速场景视点相关的绘制。综合上述算法并结合GPU的可编程功能,可以实时模拟风场作用下草地的动态效果,且真实感比较强。
In order to factually simulate dynamic effect of the changeful grass in wind,in this paper we deem the wind field as a stationary stochastic process with time and spatial correlations in view of the structural dynamics,and use linear auto-regression filter to generate eligible wind speed vector field,then use finite element method of dynamics to compute the stress and deformation of different part of grass driven by the wind force in real time.In addition,we adopt an L-system based and image based representation method to perform the parameterized modelling of grass in close view,and model the grass in far view with star structure for speeding up the rendering of scenery view corresponded.The real time simulation of dynamic effect of the grassland in wind field can be achieved with quite high reality by integrating the above algorithms and in conjunction with the programming function of GPU.
出处
《计算机应用与软件》
CSCD
2010年第5期230-233,共4页
Computer Applications and Software
关键词
动态草地场景
风场
线性自回归模型
有限元分析
计算机动画
Dynamic grassland scenes Wind field Linear auto-regression filter Finite element analysis Computer animation
