Space-scale structure for information rejection in large-scale distributed virtual environments

Farcet, Nicolas

doi:10.1109/vrais.1998.658506

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…Also the two frameworks are partly equivalent. For instance; the perception limit of [24] is proportional to the inverse of the minimum detail size of this paper. However, as a result of the authors being preoccupied with retrieval of information over networks, the local client they implement for rendering the world is not as efficient as the one presented in this paper.…”

Section: Discussionmentioning

confidence: 87%

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Frustum slicing

Bormann

2002

Virtual Reality

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Abstract:In this paper visil~ility culling is integrated tightly with an octree data structure. This is done by slicing the frustum in such a way that the minimal distance from the eye to objects in a given frustum slice is twice the minimai eye to object distance of the previous slice. Then, if one has a fixed minimaI detaii size, i.e. a minimal spatial angle so that obiects of iesser angular extensions are not rendered to the screen then, going from one slice to the next, objects must be twice as big in order to be rendered. This corresponds to traversing the octree one level less deeply. Thus the minimal detail size hugely cuts the number of nodes that the rendering algorithm must visit, a fact that becomes even more pronounced when noting that small objects are far more prevalent than are big objects. By splitting the frustum into focal and peripheral frusta and, consequently, splitting frustum slices into focal and peripheral ones, one can further take advantage of detail elision by' rendering objects far from the line of sight only to some larger minimaI detail size.

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Section: Discussionmentioning

confidence: 87%

“…Another attempt to use an octree as the organising principle of world management is given by Farcet and Torquet [24] in the context of distributed VR-systems. Because the same underlying data structure is used, the frustum slicing algorithm will integrate well with their distributed architecture.…”

Section: Discussionmentioning

confidence: 99%

Frustum slicing

Bormann

2002

Virtual Reality

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“…A solution would be to locally refine the regular partition or add subregions at run-time. In [4], Farcet et al analyze a dynamic octree partitioning scheme that adapts to the actual clustering of entities in the world. However maintaining world consistency with such a scheme would be difficult under real-world conditions.…”

Section: Spatial Partitionsmentioning

confidence: 99%

Partitioning crowded virtual environments

Steed

Abou-Haidar

2003

Proceedings of the ACM Symposium on Virtual Reality Software and Technology

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We investigate several techniques that partition a crowded virtual environment into regions that can be managed by separate servers or mapped onto different multicast groups. When constructing a partitioning, we attempt to minimize overhead of the partitioning with respect to network management, whilst maintaining a bound on the number of entities that are mapped to any particular server or group.We compare several partitioning schemes: quad tree, k-d tree unconstrained, k-d tree constrained, and region growing. With our simulations of a crowded virtual environment modelled on a part of central London, we find that the region growing technique give the best overall results.

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User level quality of service mapping for networked virtual environments

Zhou

Gračanin²

2003

Proceedings of the 7th International Conference on Telecommunications, 2003. ConTEL 2003.

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Quality of Service (QoS) can he provided as a per-applications. QoS in general means "the totaliry of features application service, a network layer option or both. Many of the and characteristics of a product of service that bears its proposed QoS architectures for Networked Virtual Environments ability sarisfL stated or inzplied needs.. (British Standards (NVE) applications include the per-application service approach. Most of them on video and audio components with less Institution). Therefore, quality should be measurable (metrics) emphasis on user interactions and user level QoS. This paper and perceivable to the user and service should match the needs describes a top down approach to address wer level QoS issue. of the user. For a @\'en mer level QoS value, network requirement5 can For a given user level QoS value, network requirements can be reduced by optimizing task or application Level scenarios. It is based on the concept of QoS translation and mapping among user, application and network layers. The mapping of The maPPil1g of QoS metrics between user and application QoS metria between wer and application levels is achieved levels and then translation of the application level QoS values by using the summative evaluation technique and by analyzing to network requirements provides a way to measure QoS at the statistical results. The derived mapping function provides the level, The rest of the paper is organized as follows. Section I1 re-a set of application level QoS values for a given user level QoS value. The application level QoS values are translated to network requirements using level tracking, simulation or views and describes QoS metrics at different levels. Section III network monitor tools. The end result is the optimal set of the describes proposed QoS mapping and architecture. Section IV application level QoS values that provides the desired user level describes the implementation and provides an example of QoS while minimizing network requirements. An example based the proposed approach. Section v

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Space-scale structure for information rejection in large-scale distributed virtual environments

Cited by 5 publications

References 14 publications

Frustum slicing

Frustum slicing

Partitioning crowded virtual environments

User level quality of service mapping for networked virtual environments

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