Level of Detail (LOD)

多分辨率的分析与表达

多分辨率表达 Multiresolution Representation

Multiresolution Representation of \(M\) = Base mesh \(M^0\) + A sequence of refinements \(M^i\)

\(M_i\)： (中间的操作)，记录简化过程

多分辨率分析 Multiresolution Analysis

[Lounsbery-etal93] [Eck-etal95] [Certain-etal96]

1. Discrete LOD

提前生成好不同 level 的模型，根据实际情况决定用哪个可能存在跳变。

2. Continuous LOD

记录中间操作，可以只增加或减少一个边
消耗计算资源，因此不常用

👆 recode sequence of edge collapses

3. View‐Dependent LOD

Show nearby portions of object at higher resolution than distant portions

Challenges

• 纹理的简化
  • 熵、保特征…
• 数据组织与调度
  • 虚拟纹理
  • 虚拟几何
• 计算模式
  • Client/Server (CS)
  • Browser/Server (BS)
  • Cloud‐Edge‐Client computing：云、边、端
• …

Resources

• Internet, Papers, Siggraph courses
• VDSlib ‐http://vdslib.virginia.edu
  • A public‐domain view‐dependent simplification and rendering package/library
• Luebke's work on view‐dependent simplification:
  • http://www.cs.virginia.edu/~luebke/simplification.html
• Hoppe's work on progressive meshes:
  • http://www.research.microsoft.com/~hhoppe
• Garland's work on quadric error metrics:
  • http://www.uiuc.edu/~garland
  • http://www.cs.cmu.edu/afs/cs/user/garland/www/multires/survey.html
• The Multi‐Tesselation (MT) homepage:
  • http://www.disi.unige.it/person/MagilloP/MT

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