【笔记】Polygon mesh processing 学习笔记（7）

最新推荐文章于 2022-06-28 20:55:07 发布

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最新推荐文章于 2022-06-28 20:55:07 发布 · 660 阅读

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#学习 #mesh #几何学 #图形渲染

本文探讨了几何模型修复的重要性和常见问题，包括修复孤立点、悬挂边、奇点、拓扑噪声等缺陷。修复过程涉及识别上游和下游应用的需求，选择合适的算法或序列。不同的输入类型如扫描模型、NURBS曲面等，修复方法各异，包括表面修复、一致性法线定向、洞填充和体素化修复。虽然存在自动化工具，但人工交互往往仍不可或缺。

多边形网格处理（7）

7. Repairing

Definetion

Problem statement

Model repair, removing artifacts from a geometric model, generate output suitable for further processing by downstream applciations that require centain quality guarantees.

Application dependent

Depends on the particular application scenario:
- “models”
- “artiface”
- “Suitable for further processing”
One application (CAD/CAM)
- Models, trimmed NURBS surfaces to represent freeform surface geometry
- Numerical fluid simulations needs a watertight, manifold triangle mesh as input (Downstream applications)
- Intermediate stage: convert the NURBS surface into a triangle mesh. Introducing meshing artifaces
- REPAIR: usually a tedious manual post-process

Repairing Guidelines

What is the upstream applications? Determines characteristics and defects of input.
What is the downstream applications? Determines requirements on output.
Based on this information. is it necessary to repair the input?
- If necessary, is there an algorithm that does it directly?
  - If direct repair is not possibl, can several algorithms be used insequence?
    - If not, there is a gap in the state-of-the-art.