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RayCaching: Amortized Isosurface Rendering for Virtual Reality
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Visual Information and Interaction. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computerized Image Analysis and Human-Computer Interaction.
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computerized Image Analysis and Human-Computer Interaction. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Visual Information and Interaction.
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computerized Image Analysis and Human-Computer Interaction. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Visual Information and Interaction.ORCID iD: 0000-0001-9739-0364
2020 (English)In: Computer graphics forum (Print), ISSN 0167-7055, E-ISSN 1467-8659, Vol. 39, no 1, p. 220-230Article in journal (Refereed) Published
Abstract [en]

Real‐time virtual reality requires efficient rendering methods to deal with high‐ resolution stereoscopic displays and low latency head‐tracking. Our proposed RayCaching method renders isosurfaces of large volume datasets by amortizing raycasting over several frames and caching primary rays as small bricks that can be efficiently rasterized. An occupancy map in form of a clipmap provides level of detail and ensures that only bricks corresponding to visible points on the isosurface are being cached and rendered. Hard shadows and ambient occlusion from secondary rays are also accumulated and stored in the cache. Our method supports real‐time isosurface rendering with dynamic isovalue and allows stereoscopic visualization and exploration of large volume datasets at framerates suitable for virtual reality applications.

Place, publisher, year, edition, pages
2020. Vol. 39, no 1, p. 220-230
Keywords [en]
ray tracing, visibility, point-based models, virtual reality
National Category
Computer Sciences
Research subject
Computerized Image Processing
Identifiers
URN: urn:nbn:se:uu:diva-398397DOI: 10.1111/cgf.13762ISI: 000519969500017OAI: oai:DiVA.org:uu-398397DiVA, id: diva2:1375732
Available from: 2019-12-05 Created: 2019-12-05 Last updated: 2020-05-06Bibliographically approved
In thesis
1. Modeling and Visualization for Virtual Interaction with Medical Image Data
Open this publication in new window or tab >>Modeling and Visualization for Virtual Interaction with Medical Image Data
2020 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Interactive systems for exploring and analysing medical three dimensional (3D) volume image data using techniques such as stereoscopic rendering and haptics can lead to new workflows for virtual surgery planning. This includes the design of patient-specific surgical guides and plates for additive manufacturing (3D printing). Our applications, medical visualization and cranio-maxillofacial surgery planning, involve large volume data such as computed tomo\-graphy (CT) images with millions of data points. This motivates the development of fast and efficient methods for visualization and haptic rendering, as well as the development of efficient modeling techniques for simplifying the design of 3D printable parts. In this thesis, we develop methods for visualization and haptic rendering of isosurfaces in volume image data, and show applications of these methods to medical visualization and virtual surgery planning. We further develop methods for modeling surgical guides and plates for cranio-maxillofacial surgery, and integrate them into our system for haptics-assisted surgery planning called HASP. This system is now installed at the department of surgical sciences, Uppsala University, and is being evaluated for use in clinical research.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2020. p. 50
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1898
Keywords
medical image processing, volume rendering, haptic rendering, medical visualization, virtual surgery planning
National Category
Computer Sciences Medical Image Processing
Research subject
Computerized Image Processing
Identifiers
urn:nbn:se:uu:diva-403104 (URN)978-91-513-0864-7 (ISBN)
Public defence
2020-03-13, ITC 2446, Lägerhyddsvägen 2, Hus 2, Polacksbacken, Uppsala, 10:15 (English)
Opponent
Supervisors
Available from: 2020-02-19 Created: 2020-01-23 Last updated: 2020-02-19

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Nysjö, FredrikMalmberg, FilipNyström, Ingela

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