基于线性八叉树光线投射算法在云可视化方面的应用  

Ray Casting Algorithm Based on Linear Octree Structure for Cloud Visualization

作　　者：谢永华[1,2] 王畅[1] 袁复兴[1] 

机构地区：[1]南京信息工程大学计算机与软件学院,南京210044 [2]南京信息工程大学江苏省网络监控中心,南京210044

出　　处：《科学技术与工程》2014年第30期191-195,201,共6页Science Technology and Engineering

基　　金：国家"863"计划专项(2011AA7123032B);国家自然科学基金资助项目(61375030)资助

摘　　要：针对传统体绘制算法采样效率低,内存消耗大,绘制速度慢等缺点,提出了基于线性八叉树的光线投射算法并用于真实云图可视化。该方法首先通过线性八叉树对传统光线投射算法和存储进行优化加速,并结合Blinn-Phong光照模型增强每个体素的色彩渲染;然后采用合成公式求累积像素值。利用明暗计算的效果显示云的边界面,最终实现云数据的可视化。实验仿真结果表明,该算法在增强绘制效果和加快绘制速度方面的有效性。Aiming at the low efficiency of sampling,big memory consumption,slow speed of drawing shortcomings of traditional volume rendering algorithm,the light projection algorithm is put forward based on linear octree is used for real cloud image visualization.This method first by linear octree optimize traditional casting algorithm and the storage speed,and combining the Blinn-Phong illumination model enhance colour rendering of ividual element,then use the synthesis formula for cumulative pixel values,calculated by use of light and shade effect shows that the boundary of the cloud,and realize the cloud visualization.Experimental simulation results show that the effectiveness of the proposed algorithm about enhancing rendering effect and rendering speed.

关 键 词：云 线性人飞村 光线投射 光照模型 可视化 

分 类 号：TP317.4[自动化与计算机技术—计算机软件与理论]