Cut and Paint: Occlusion-Aware Subset Selection for Surface Processing

Mohamed Radwan, Stefan Ohrhallinger, Elmar Eisemann, Michael Wimmer
Cut and Paint: Occlusion-Aware Subset Selection for Surface Processing
In Proceedings of Graphics Interface 2017, pages 82-89. May 2017.
[paper]

Information

Abstract

User-guided surface selection operations are straightforward for visible regions on a convex model. However, concave surfaces present a challenge because self-occlusions require multiple camera positions to get unobstructed views. Therefore, users often have to locate and switch to new unobstructed views in order to continue the operation. Our novel approach enables operations like painting or cutting in a single view, even on the backside of objects and for arbitrary depth complexity, with interactive performance. Continuous projection of a curve drawn in screen space onto the mesh guarantees seamless brush strokes or manifold cuts, unaffected by any occlusions.

Our occlusion-aware surface-processing method enables a number of applications in an easy way. As examples, we show continuous painting on the surface, selecting regions for texturing, creating illustrative cutaways from nested models and animation of cutaways.

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image: Occlusion-aware generation of a cutaway illustration. image: Occlusion-aware generation of a cutaway illustration.

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BibTeX

@inproceedings{Radwan-2017-Occ,
  title =      "Cut and Paint: Occlusion-Aware Subset Selection for Surface
               Processing",
  author =     "Mohamed Radwan and Stefan Ohrhallinger and Elmar Eisemann
               and Michael Wimmer",
  year =       "2017",
  abstract =   "User-guided surface selection operations are straightforward
               for visible regions on a convex model. However, concave
               surfaces present a challenge because self-occlusions require
               multiple camera positions to get unobstructed views.
               Therefore, users often have to locate and switch to new
               unobstructed views in order to continue the operation. Our
               novel approach enables operations like painting or cutting
               in a single view, even on the backside of objects and for
               arbitrary depth complexity, with interactive performance.
               Continuous projection of a curve drawn in screen space onto
               the mesh guarantees seamless brush strokes or manifold cuts,
               unaffected by any occlusions.  Our occlusion-aware
               surface-processing method enables a number of applications
               in an easy way. As examples, we show continuous painting on
               the surface, selecting regions for texturing, creating
               illustrative cutaways from nested models and animation of
               cutaways.",
  month =      may,
  booktitle =  "Proceedings of Graphics Interface 2017",
  doi =        "10.20380/GI2017.11",
  event =      "Graphics Interface 2017",
  location =   "Edmonton, Alberta, CA",
  publisher =  "Canadian Human-Computer Communications Society /
               Soci{\'e}t{\'e} canadienne du dialogue humain-machine",
  pages =      "82--89",
  URL =        "https://www.cg.tuwien.ac.at/research/publications/2017/Radwan-2017-Occ/",
}