CAJ | 학술논문

现有的基于网络的远程绘制系统在绘制过程中对网络带宽和时延具有较强的依赖性,为了获得较高的绘制速度,需要耗费大量的预处理时间和存储空间.针对网络环境下模型的设计校审工作对预处理时间、绘制速度和图像质量的实际需求,提出一种基于外存的大规模流程工厂模型交互绘制算法.绘制前,首先从服务器端获取模型的几何参数和拓扑信息;然后根据流程工厂模型特征,在客户端以设备和管线为基本单位组织外存数据,采用体元合并的方法快速完成模型层次细节的计算和存储.分析了校审内容和校审人员的运动习惯,并将其与基于视点可见性的预取算法相结合,在本地实现外存数据的高效预取,且绘制过程中无需传输模型面片信息.实验结果表明,文中方法在普通PC机上能够将具有21M左右面片模型的预处理时间控制在5min以内,在保证校审所需图像质量的前提下取得平均30帧/s的平稳帧速,且绘制过程不依赖网络带宽和时延.
현유적기우망락적원정회제계통재회제과정중대망락대관화시연구유교강적의뢰성,위료획득교고적회제속도,수요모비대량적예처리시간화존저공간.침대망락배경하모형적설계교심공작대예처리시간、회제속도화도상질량적실제수구,제출일충기우외존적대규모류정공엄모형교호회제산법.회제전,수선종복무기단획취모형적궤하삼수화탁복신식;연후근거류정공엄모형특정,재객호단이설비화관선위기본단위조직외존수거,채용체원합병적방법쾌속완성모형층차세절적계산화존저.분석료교심내용화교심인원적운동습관,병장기여기우시점가견성적예취산법상결합,재본지실현외존수거적고효예취,차회제과정중무수전수모형면편신식.실험결과표명,문중방법재보통PC궤상능구장구유21M좌우면편모형적예처리시간공제재5min이내,재보증교심소수도상질량적전제하취득평균30정/s적평은정속,차회제과정불의뢰망락대관화시연.
The performance of current network-based remote rendering systems relies on the bandwidth and latency of the network during visualization. In order to gain high frame rates, they need time consuming preprocessing and additional storage. Design review has practical requirements on the preprocessing time, frame rates and visual fidelity. In this paper, a network-based interactive out-of-core rendering system for large-scale process plant models was proposed. First, the model's geometry parameters and topology information are transmitted from the server before visualization. Then the model's out-of-core representation is organized and computed locally according to the model feature. By analyzing the content and motion characteristic of the reviewer, a novel visibility-based pre-fetching technique is presented. It takes into account the reviewer's motion characteristic. No triangles are transmitted during visualization. The algorithm can be implemented on a general PC over the network. It can preprocess a 21-million-triangles model within 5 minutes and achieve 30 fps smooth frame rates on average without sacrificing the image quality. Experimental results show that the rendering performance doesn't depend on the network's bandwidth and latency.