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中国科学院软件研究所
  
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陈彦云,吴恩华,孙家广.可大规模应用的辐射度计算的自动网格化方法.软件学报,1999,10(5):449-454
可大规模应用的辐射度计算的自动网格化方法
An Automatic Meshing Scheme for Radiosity Calculation of Large-scale Application
投稿时间:1997-10-20  修订日期:1998-05-28
DOI:
中文关键词:  辐射度,面片,面元,网格化.
英文关键词:Radiosity, patch, element, meshing.
基金项目:本文研究得到国家自然科学基金和国家“九五”重点科技攻关项目基金资助.
作者单位
陈彦云 中国科学院软件研究所计算机科学开放研究实验室,北京,100080 
吴恩华 中国科学院软件研究所计算机科学开放研究实验室,北京,100080
澳门大学科技学院,澳门 
孙家广 清华大学计算机科学与技术系,北京,100084 
摘要点击次数: 2258
全文下载次数: 273
中文摘要:
      合理地网格化场景是有效地进行辐射度计算的重要前提.现有的两种主要剖分方法是细分法和阴影边界计算法.前者是在必要时对大面片进行自动细分,后者是先解析地求出阴影的区域,然后根据阴影边界进行划分.前者存在的问题是无法检测出落在大面片中间的细节变化,绘制的质量得不到保证.后一种方法又局限于基本上只能处理纯多边形场景,而且计算时间长,实现复杂,难以在工程上进行应用.文章提出一种网格化方法,它面向大规模工程应用,简便易行,并能生成较高质量的图像.这种方法先将能量接受面划分成满足精度要求的细小面元,然后根据各面元对场景中各光源的可见性特征进行合并操作,以使能量变化情况不同的区域能以不同大小的尺寸进行剖分,这样,用于计算的面片大大减少,而图像质量没有明显的降低.实验结果和统计数据表明,此方法因其简单、高效,很适合大规模的工程应用.
英文摘要:
      Properly meshing a scene model is an important precondition to efficient radiosity calculation. There are basically two existing meshing strategies, subdivision method and shadow boundary calculation method. By the former method, large patches are automatically subdivided while necessary, and in the latter method, meshing is performed along the shadow boundary of the regions and the shadows in the scene are analytically pre-calculated. The problem in the former strategy is the detail between vertices of a big patch could be missed, so the rendering quality is unable to be assured. On the other hand, the latter approach has a limitation of being primarily applied to polyhedral scenes, and its complexity of implementation and the requirement of heavy computation also prevent itself from being applied in engineering applications. In this paper, the authors present a meshing scheme, with a primary destination towards large-scale engineering applications with a property of easy implementation and high efficiency in producing high quality images. By the scheme, they first divide the energy-receiving surfaces into small elements with a desire precision and then recombine the elements according to their visibility feature to the light source within the environment. In this method, the regions in different energy distribution could be meshed by different scale. As a result, the number of patches to be calculated is greatly reduced without degrading the image quality. The implementation and the statistics from test examples show that the scheme is particularly suitable for large-scale engineering applications due to its ease of implementation and high efficiency.
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