1 / 12

Mesh fixup II

Mesh fixup II. Rudro Samanta Princeton University. Using tolerances. Give vertices and edges “tolerance” Steps in the algorithm Vertex merging Edge merging Edge breaking. Drawbacks. Spike generation User intervention required Tolerance must be chosen carefully

nieve
Download Presentation

Mesh fixup II

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Mesh fixup II Rudro Samanta Princeton University

  2. Using tolerances • Give vertices and edges “tolerance” • Steps in the algorithm • Vertex merging • Edge merging • Edge breaking

  3. Drawbacks • Spike generation • User intervention required • Tolerance must be chosen carefully • How to maintain features ? • Backtracking is expensive

  4. Radiosity requirements • Continuous interpolation • Well shaped • Sufficient radiator density • Sufficient receiver node density • Intersecting faces should be represented explicitly

  5. Processing stages • Grouper • Merges geometry • Removes T vertices • Maximizes coplanar faces

  6. Stages continued • Lsect • Removes face intersections by breaking planes • Coplanar • Removes overlapping coplanar faces • Pmesh • Uniformly subdivides faces • Initially squares and then traiangulation • Emesh

  7. Problems • Again a error tolerance is required • Authors say this is automatically computed (“scene relative tolerance”)

  8. Spatial subdivision • Divide space by polygon planes • Generate solidity values • Create consistent model

  9. Example fixup

  10. Drawbacks • Missing polygons • May generate spurious features • Connected parts • Solidity determination becomes unclear

  11. Conclusion • Approaches are usually straightforward • Need some user intervention in many pf the processes (usually for error bound) • Missing polygons still a mystery

  12. Future work • The next level • (Fuzzy ?) Object recognition • Characteristic database and detection • Procedural correction

More Related