3D laser scanners become more and more popular especially for measuring construction sites, in the field of architecture and for preservation of monuments. As these scanners can only record discrete data sets (point c...
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3D laser scanners become more and more popular especially for measuring construction sites, in the field of architecture and for preservation of monuments. As these scanners can only record discrete data sets (point clouds), it is necessary to mesh these sets for getting closed 3D models and take advantage of 3D graphics acceleration of modern graphics hardware. The meshing process is a complex issue and in the last years there were lots of algorithms developed to solve this problem. In this work a continuous Level-of-Detail (LOD) algorithm will be presented, from which a simplified 3D surface model can be created, which uses only as much triangles as needed. The grade of simplification is user-defined by an error tolerance similar to the Hausdorff distance. This algorithm is not a dynamic (view-dependent) LOD mesh simplification, but a non-redundant approximation of point clouds. It is a simple and extendable meshing algorithm, which is made up of a mixture of some techniques adapted from popular terrain LOD algorithms. The algorithm has been implemented in an OpenGL based editing tool for 3D point clouds called PointMesh, which will be explained in detail. We present examples from an excavation site (church rest of Lorsch Abbey, Germany), the inner part of the Heidelberg Tun (German: Großes Fass, an extremely large wine vat) and the Old Bridge gate, Heidelberg. For different cut-outs a performance comparison of the regular mesh to various adaptive 4-8-meshes with different error tolerances is given in terms of frame rates.
This paper describes a novel approach to authoring multimedia documents based on the walk-Through paradigm. Using this approach, multimedia authoring tasks can be performed in the context of the multimedia presentatio...
作者：
Edwards, W. KeithGraphics
Visualization and Usability Center College of Computing Georgia Institute of Technology AtlantaGA30332-0280 United States
Session management systems for collaborative applications have required a great deal of reimplementation work by developers because they have been typically created on a case-by-case basis. Further, artifacts of this ...
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作者：
Foley, James D.Graphics
Visualization and Usability Center College of Computing Georgia Institute of Technology AtlantaGA30332-0280 United States
Developing high-quality user interfaces is becoming the critical step in bringing many different computer applications to end users. Ease of learning and speed of use typically must be combined in an attractively-desi...
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This paper presents a simple but very powerful technique to support user interface evaluation, along with a prototype implementation of this technique. This technique provides tools to allow the user interface evaluat...
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While graphical user interfaces have gained much popularity in recent years, there are situations when the need to use existing applications in a nonvisuat modrdity is clear. Examples of such situations include the us...
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作者：
Stasko, John T.Graphics
Visualization and Usability Center College of Computing Georgia Institute of Technology AtlantaGA30332-0280 United States
This demonstration describes a new approach to algorithm animation, one in which the students construct the animations. We introduce the Samba system that facilitates this process and describe how it has been used an ...
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ISBN:
(纸本)0897919262
This demonstration describes a new approach to algorithm animation, one in which the students construct the animations. We introduce the Samba system that facilitates this process and describe how it has been used an undergraduate algorithms courses as a teaching aid. Having students build the animations, that is, construct the mapping from concepts to images, appears to enable true understanding of the algorithm under study.
作者：
Zhao, Qiang AlexStasko, John T.Graphics
Visualization and Usability Center Georgia Institute of Technology Atlanta College of Computing GA 30332-0280 United States
This article introduces the "What's Happening" desktop application for maintaining and enhancing community awareness. "What's Happening" uses a small visualization display and animation to ...
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ISBN:
(纸本)1581132484
This article introduces the "What's Happening" desktop application for maintaining and enhancing community awareness. "What's Happening" uses a small visualization display and animation to provide unobtrusive information delivery and lightweight chat-room support. The article also discusses our early experiences with the system.
作者：
Stasko, John T.Wehrli, Joseph F.Graphics
Visualization and Usability Center College of Computing Georgia Institute of Technology AtlantaGA30332-0280 United States
Algorithm animation is the process of abstracting a program's data, operations, and semantics, and creating dynamic graphical views of those abstractions[Sta90]. Algorithm animation systems have been used for both...
ISBN:
(纸本)9781450378048
Algorithm animation is the process of abstracting a program's data, operations, and semantics, and creating dynamic graphical views of those abstractions[Sta90]. Algorithm animation systems have been used for both instructional purposes such as augmenting classroom lectures and for "visually documenting" complex programs. To now, algorithm animation systems have supported only 2-D black-and-white or color views. Our work extends algorithin animation to three-dimensional computer graphics.
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