Niklas Elmqvist, Ph.D.


  
occlusion management
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Synopsis: Techniques for intelligent management of 3D views to minimize the impact of occlusion on visualization in 3D environments.

News

  • (2008-2-19) TVCG paper - Our journal paper consolidating and summarizing the occlusion management project has been accepted (with minor revisions) to IEEE TVCG ! This is definitely the best venue for the paper and will be a great way to disseminate our findings widely.
  • (2006-12-19) Dissertation successfully defended! - Today I successfully defended my dissertation, entitled "3D Occlusion Management and Causality Visualization".

Details

In this project, we study the problem space of occlusion in 3D environment and develop models and methods to reduce, or, in some special cases, eliminate the impact of occlusion on user efficiency and correctness in solving visual tasks. We believe that this will help improve the usability of 3D visualization on a broad scale, allowing designers to more readily adopt 3D computer graphics for their user applications without having to fear disorienting and alienating their users.

Our research on this problem is a multi-pronged approach:

  • View projection manipulation. Modifying the view projection to minimize occlusion.
  • Multiple views. Introducing additional views to disambiguate occlusion.
  • Transparency. Utilize dynamic transparency to allow occluded objects to be visible.
  • Navigation Guidance. Guide the user through 3D environments using computed tours from which all objects are visible.
  • Explosion. Direct manipulation explosion techniques for discovering and accessing occluded targets.
  • Awareness. Make the user aware of occluded objects through textual displays or on-scene labelling, etc.

People

Publications

  • N. Elmqvist, P. Tsigas. A Taxonomy of 3D Occlusion Management for Visualization. IEEE Transactions on Visualization and Computer Graphics, 14(5):1095-1109, 2008. [PDF] [BibTeX] [Website]
  • N. Elmqvist, P. Tsigas. A Taxonomy of 3D Occlusion Management Techniques. In Proceedings of the IEEE Conference on Virtual Reality, pp. 51-58, 2007. [PDF] [BibTeX] [Website]

Media

Spherical BalloonProbe Spherical BalloonProbe Wedge BalloonProbe Wedge BalloonProbe Image-space dynamic transparency Image-space dynamic transparency Image-space dynamic transparency View projection animation (perspective) View projection animation (parallel) View projection animation in Blender3D Voxelization process for 3D spatial analysis. 3D navigation assistance in outdoor world. 3D navigation assistance in indoor world. 3D navigation assistance in information landscape. 3D navigation assistance in 3D conetree.