NDLI: Levels of detail (LOD) engineering of VR objects

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Levels of detail (LOD) engineering of VR objects

Content Provider	ACM Digital Library
Author	Seo, Jinseok Kim, Gerard Jounghyun Kang, Kyo Chul
Abstract	For real-time performance, virtual reality systems often employ various performance optimization techniques. One of the most popular methods is using geometric models with different “Levels of Detail (LOD)”. In a previous paper by this author [1], we have proposed to use software engineering principles such as the concept of hierarchical and incremental modeling, and simultaneous consideration of form, function and behavior for modeling VR objects. Each refinement stage driven by such a modeling philosophy produces step-by-step form, function and behavior specifications of a VR object. We can make good use of these by-products as LOD for adaptive display and simulation by additionally specifying conditions for LOD switching. These specifications can be simulated and analyzed in advance for an estimation of performance for a given VR execution environment. Such an engineering process deals with behavior and geometry together; different geometric LOD may possess different behaviors and vice versa. A certain function or behavior might dictate an inclusion of a particular geometric feature that may not be possible to preserve, if the geometric LOD were to created in a bottom-up fashion (e.g. using the mesh simplification algorithms). We demonstrate our approach by modeling an automobile object with three levels of geometric and behavior detail in a top-down manner, simulate their instances in a small virtual town, and based on the simulation result, make predictions to the maximum allowable number of vehicles that will maintain an acceptable frame rate if executed in a faster simulation environment. We believe that our approach combines the idea of hierarchical refinement of virtual objects and the use of LOD in a very natural and intuitive manner.
Starting Page	104
Ending Page	110
Page Count	7
File Format	PDF
ISBN	1581131410
DOI	10.1145/323663.323680
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1999-12-20
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Levels of detail (lod) Real-time rendering Top-down design Specificastion Simulation Software engineering
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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