基于Web的时变体数据的体绘制方法  

Volume Rendering of Time-Varing Volume Data in Web

作　　者：张桢 吴亚东[1,2] Zhang Zhen;Wu Yadong(School of Computer Science and Technology,Southwest University of Science and Technology,Mianyang 621000,China;Sichuan University of Science&Engineering,Yibin644005,China)

机构地区：[1]西南科技大学计算机科学与技术学院,四川绵阳621000 [2]四川轻化工大学,四川宜宾644005

出　　处：《计算机测量与控制》2020年第4期205-210,216,共7页Computer Measurement &Control

基　　金：国家自然科学基金(61802320,61872304);国防基础科研计划(JCKY2017404C004)。

摘　　要：传统Web体绘制方法主要集中在利用服务器端进行预处理和绘制任务,浏览器端仅用于呈现绘制结果,这样会造成服务器负载过高,同时,当绘制参数发生更改时,必须向服务器请求新的绘制结果,这样也易受网络延迟的影响;为了解决以上问题,实现在浏览器本地进行体绘制和交互,文章提出一种基于WebGL的体绘制方法,以时变体数据为例,在浏览器端实现光线投射体绘制算法;同时,为了提升绘制效率和减少内存占用,文章基于维度压缩方法,优化时变体数据的预处理过程;最后,文章设计了Web体绘制系统,引入暴风时变数据集以验证方法的有效性,结果表明,该方法能够在浏览器本地对时变体数据进行体绘制,绘制时间在50ms以下,帧速率可达到50FPS以上,同时支持实时交互,并且当绘制参数发生更改时,系统能够直接在浏览器端进行重新绘制。Traditional web volume rendering methods mainly focus on use of server for preprocessing and rendering,the browers is only used to be display the rendering result.This will cause high server load.Moreover,request for new rendering result must be sent to server when rendering parameters change,which is also susceptible to network latency.To solve the above problems,realizing volume rendering and interaction in browsers,a WebGL-based volume rendering method is proposed in this paper,which implemented ray-casting algorithm,taking time-varing volume data as example,in browers.In addition,for reducing rendering time and memory usage,the preprocessing of volume data is optimized based on dimension compression method.Finally,this paper designed a web volume rendering system,and introduced Isabel Hurricane data sets to verify the effectiveness of the methods.The results show that this method can realize volume rendering of time-varing data in the browser.The rendering time is less than 50 ms,and the frame rate can reach more than 50 FPS.Furthermore,it supports real-time interaction and redraw directly in the browser when the rendering parameters change.

关 键 词：体绘制 WEBGL 时变体数据 维度压缩 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]