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Automatic LOD selection
Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, The Institute of Technology.
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this paper a method to automatically generate transition distances for LOD, improving image stability and performance is presented. Three different methods were tested all measuring the change between two level of details using the spatial frequency. The methods were implemented as an optional pre-processing step in order to determine the transition distances from multiple view directions. During run-time both view direction based selection and the furthest distance for each direction was tested in order to measure the performance and image stability. The work was implemented in the Frostbite game engine and tested using data from DICE. The result is a method that generates transition distances by calculating the spatial frequency of the exclusive or comparison between the silhouette of a ground truth mesh and each level of detail. The transition distances generated using the automatic LOD selection tool was evaluated using visual empirical tests and performance measurements comparing the performance of a scene using automatic generated distances and manually selected distances. The tests shows that the resulting method produces good transition distances for meshes where the reduction is visible in the mesh silhouette. The values might need a bit of tweaking in order to account for other image artifacts than silhouette changes but provide a good guidance to the artists.

Place, publisher, year, edition, pages
2017. , 48 p.
Keyword [en]
LOD, Level of detail, LOD transitions, Datateknik
Keyword [sv]
Datateknik
National Category
Computer Engineering
Identifiers
URN: urn:nbn:se:liu:diva-142888ISRN: LiU-ITN-TEK-A--17/054--SEOAI: oai:DiVA.org:liu-142888DiVA: diva2:1155618
Subject / course
Computer Engineering
Uppsok
Technology
Supervisors
Examiners
Available from: 2017-11-08 Created: 2017-11-08 Last updated: 2017-11-08Bibliographically approved

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Automatic LOD selection(537 kB)6 downloads
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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • vancouver
  • Other style
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  • de-DE
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  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
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Output format
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