Real-time visualization of scalably large collections of heterogeneous objects

Davis, Douglas D.; Ribarsky, William; Jiang, Tian-yue; Fanst, N.; Ho, Sean

doi:10.1109/visual.1999.809924

Cited by 26 publications

(13 citation statements)

References 11 publications

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“…Several blocks can be in a view, depending on the viewpoint location. We have found that this balance in size makes out-of-core data retrieval efficient for a variety of data [4,3].…”

Section: Dynamic and Synchronized Data Structuresmentioning

confidence: 99%

“…Our system is built on our global geo-spatial data organization and visualization system, VGIS (Virtual Geographic Information System) [3,4,6]. VGIS treats the terrain as a single, connected surface for rendering using a continuous, view-dependent Level-Of-Detail (LOD) representation.…”

Section: Related Workmentioning

confidence: 99%

“…One data structure that can effectively accommodate these attributes is an appropriately tailored universal hierarchy. In the case of geo-spatial data, the choice is the VGIS hierarchy described above, which we have shown can be tailored to handle a wide variety of data including terrain (from low to high resolution), phototextures and maps, GIS information, 3D buildings, and even time-dependent, volume data (e.g., weather) [3,4,6,14]. The forest of quadtrees is used at the top level for each of these types of data and although each has its specific structure at higher levels of detail, the specific structures are quadnode aligned.…”

Section: Dynamic and Synchronized Data Structuresmentioning

confidence: 99%

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Situational visualization

Krum

Ribarsky

Shaw

et al. 2001

Proceedings of the ACM Symposium on Virtual Reality Software and Technology

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In this paper, we introduce a new style of visualization called Situational Visualization, in which the user of a robust, mobile visualization system uses mobile computing resources to enhance the experience and understanding of the surrounding world. Additionally, a Situational Visualization system allows the user to add to the visualization and any underlying simulation by inputting the user's observations of the phenomena of interest, thus improving the quality of visualization for the user and for any other users that may be connected to the same database. Situational Visualization allows many users to collaborate on a common set of data with real-time acquisition and insertion of data. In this paper, we present a Situational Visualization system we are developing called Mobile VGIS, and present two sample applications of Situational Visualization.

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“…Several blocks can be in a view, depending on the viewpoint location. We have found that this balance in size makes out-of-core data retrieval efficient for a variety of data [4,3].…”

Section: Dynamic and Synchronized Data Structuresmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: Dynamic and Synchronized Data Structuresmentioning

confidence: 99%

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Situational visualization

Krum

Ribarsky

Shaw

et al. 2001

Proceedings of the ACM Symposium on Virtual Reality Software and Technology

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“…Out-of-core visualization techniques are applied to cope with massive data sets stored on external memory (Davis et al [5]; Lindstrom and Pascucci [14]). Techniques have been described for large-scale virtual environments such as described by Willmott et al [19] and for large-scale texture data.…”

Section: Real-time Rendering Of 3d City Modelsmentioning

confidence: 99%

Continuous level-of-detail modeling of buildings in 3D city models

Döllner

Buchholz

2005

Proceedings of the 13th Annual ACM International Workshop on Geographic Information Systems

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This paper introduces a concept for representing and modeling buildings in GIS at continuous levels of quality. Buildings are essential objects of virtual 3D city models, which serve as platforms for integrated, urban geoinformation. Existing concepts for the representation of buildings are restricted to a specific level-of-quality such as block models, roof-including models, architectural models, and indoor virtual reality models. The continuous level-of-quality approach unifies the representation of heterogeneous sets of buildings, which occur in most virtual 3D city models. It also leads to a systematic method for the incremental refinement of buildings -an important requirement of the long-term management of virtual city models. In our concept, a building's geometry is structured on a perfloor basis; each floor refers to a floor prototype, which is defined by a ground plan, walls, and wall segments. To specify the appearance projective textures across floors and textures per wall segment are supported. Application-specific data can be associated similar to appearance information. These few components already allow us to express efficiently most common building features. Furthermore, the approach seamlessly integrates into CityGML, an upcoming standard for virtual city model data.

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“…Approximate occlusion-culling algorithms, such as [7], [8], [9], the visible primitives are rendered up to a specified threshold, i.e., some of them may not be sent to the graphics pipeline although they are visible. There are also approaches to occlusion culling that use parallel processing approaches, such as [10], [5], [11].…”

Section: Introductionmentioning

confidence: 99%

Conservative occlusion culling for urban visualization using a slice-wise data structure

Yılmaz

Güdükbay

2007

Graphical Models

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Fig. 1. An occlusion culling algorithm using our slice-wise data structure sends approximately 54 % fewer triangles to the graphics pipeline and increases frame rate by 46 %, as compared to an occlusion culling algorithm using building-level granularity of visibility in this 1.5M-triangle environment. The red colored sections show occluded regions, which are discarded from the graphics pipeline. In addition, the data structure decreases Potentially Visible Set (PVS) storage requirement drastically. AbstractIn this paper, we propose a new shrinking process for conservative from-point occlusion culling algorithms and a data structure for the visualization of urban environments. The visible geometry in a typical urban walkthrough mainly consists of partially visible buildings. Occlusion-culling algorithms, in which the granularity is based on buildings, render these partially visible buildings completely. We observe that the visibility in urban walkthroughs shows certain characteristics. The proposed slice-wise data structure represents the buildings, exploiting these characteristics, in terms of slices parallel to the coordinate axes. This forms the base for occlusion culling where the occlusion granularity is at slice level. The proposed slice-wise data structure has minimal storage requirements. The visible parts can be accessed at constant time during navigation with the help of a preprocessing stage. We also propose to shrink the occluders in a scene. This is necessary for a conservative from-point occlusion culling algorithm, which can also be applied to nonconvex general 3D occluders. Empirical results show that a 54 % decrease in the number of processed polygons and 46 % speed-up in frame-rate can be achieved by using the proposed conservative occlusion-culling algorithm with rather than an occlusion-culling method where the granularity is based on individual buildings.

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Real-time visualization of scalably large collections of heterogeneous objects

Cited by 26 publications

References 11 publications

Situational visualization

Situational visualization

Continuous level-of-detail modeling of buildings in 3D city models

Conservative occlusion culling for urban visualization using a slice-wise data structure

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