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TOM: TOTALLY ORDERED MESH A multiresolution STRUCTURE FOR TIME CRITICAL GRAPHICS APPLICATIONS

International Journal of Image and Graphics 2001年第1期1卷 115-134页

作者： ERIC BOUVIER ENRICO GOBBETTI VVR CRS4 (Center for Advanced Studies Research and Development in Sardinia) Sesta Strada Ovest Z.I. Macchiareddu C.P. 94 I-09010 Uta (CA) Italy Now working at Duran Interactive 35 rue Gabriel Peri - 92130 Issy les Moulineaux France

Tridimensional interactive applications are confronted to situations where very large databases have to be animated, transmitted and displayed in very short bounded times. As it is generally impossible to handle the complete graphics description while meeting timing constraint, techniques enabling the extraction and manipulation of a significant part of the geometric database have been the focus of many research works in the field of computer graphics. multiresolution representations of 3D models provide access to 3D objects at arbitrary resolutions while minimizing appearance degradation. We describe the TOM (Totally Ordered Mesh), a multiresolution triangle mesh structure tailored to the support of time-critical adaptive rendering. The structure grants high speed access to the continuous levels of detail of a mesh and allows very fast traversal of the list of triangles at arbitrary resolution so that bottlenecks in the graphic pipeline are avoided. Moreover, and without specific compression, the memory footprint of the TOM is small (about 108% of the single resolution object in face-vertex form) so that large scenes can be handled effectively. The TOM structure also supports storage per vertex (or per corner of triangle) attributes such as colors, normals, texture coordinates or dynamic properties. Implementation details are presented along with the results of tests for memory needs, approximation quality, timing and efficacy.

关键词： multiresolution modeling Level-of-Detail Adaptive Rendering Time-Critical Graphics

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Surface simplification using a discrete curvature norm

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COMPUTERS & GRAPHICS-UK 2002年第5期26卷 657-663页

作者： Kim, SJ Kim, CH Levin, D Korea Univ Dept Comp Sci Seoul 136701 South Korea Tel Aviv Univ Dept Math Appl IL-69978 Tel Aviv Israel Tel Aviv Univ Dept Math Appl IL-69978 Tel Aviv Israel

This paper proposes a mesh simplification algorithm using a discrete curvature norm. Most of the simplification algorithms are using a distance metric to date. The distance metric is very efficient to measure geometric error, but it is difficult to distinguish important shape features such as a high-curvature region even though it has a small distance metric. We suggest a discrete curvature norm to measure geometric error for such features. During simplification the new vertex resulted from an edge collapse takes a position using a butterfly subdivision mask to minimize geometric error. This paper shows that simplification results have smaller geometric errors than previous works, when a discrete curvature norm and a distance metric are together applied to its criterion. (C) 2002 Published by Elsevier Science Ltd.

关键词： surface simplification multiresolution modeling edge collapse level of detail discrete curvatures

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Research on Real-Time Geometry Compression Method in Distributed Parallel Rendering System for Virtual Manufacturing

Research on Real-Time Geometry Compression Method in Distrib...

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4th IEEE Conference on Industrial Electronics and Applications

作者： Gao Xin Jia Qing-xuan Sun Han-xu Song Jing-zhou Beijing Univ Posts & Telecommun Sch Automat Beijing 100876 Peoples R China

ISBN: (纸本)9781424427994

The paper describes a mehod for compression of geometry data stream in distributed parallel rendering systems. First this paper uses edge collapse method with discrete curvature error metric to construct multi-resolution models, and use variable quantization of precision to compression 3-dimensional models;then models were provided to view-dependent progressive transmission method to deal with, and implement it with a distributed parallel rendering system for virtual manufacturing;While this paper use the parallelogram prediction of vertex coordinates and the angular space within one sextant of normal to compress 3-dimensional models, alleviating network bandwidth bottleneck.

关键词： distributed parallel rendering multiresolution modeling view-dependent geometry compression

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A FRAMEWORK FOR MULTI-RESOLUTION modeling OF SUSTAINABLE MANUFACTURING

A FRAMEWORK FOR MULTI-RESOLUTION MODELING OF SUSTAINABLE MAN...

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2010 Winter Simulation Conference

作者： Jain, Sanjay Kibira, Deogratias George Washington Univ 2201 G St NWSuite 415 Washington DC 20052 USA Natl Inst Stand & Technol Gaithersburg MD 20899 USA

ISBN: (纸本)9781424498642

This paper proposes a multi-resolution framework for application of system dynamics modeling to sustainable manufacturing. Sustainable manufacturing involves interaction of four complex systems namely manufacturing, environmental, financial, and social domains. The proposed framework integrates model components corresponding to the four major domains. Conceptual models are proposed at two levels of resolution for each of the four domains with models provided in this paper for the manufacturing domain.

关键词： complex system manufacturing systems multiresolution modeling sustainable development sustainable manufacturing system dynamics modeling

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Out-of-core construction and 3D visualization of level-of-detail terrains populated with large collection of heterogeneous objects

Out-of-core construction and 3D visualization of level-of-de...

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1st International Conference on Computer Graphics Theory and Applications (GRAPP 2006)

作者： Agrawal, Anupam Radhakrishna, M. Joshi, R. C. Deemed Univ Indian Inst Informat Technol Allahabad 211012 Uttar Pradesh India Indian Inst Technol Dept Elect & Comp Engn Roorkee 247667 Uttar Pradesh India

ISBN: (纸本)9728865392

Interactive visualization of very large-scale terrain data in scientific visualization, GIS or simulation and training applications is a hard problem. The grid digital terrain elevation and texture data are not only too large to be rendered in real-time but also exceed physical main memory capacity. Therefore out-of-core management of digital terrain data is an essential requirement. Further to bring photorealism in visualization, it is required to place multiple collections of man-made objects such as buildings, lampposts etc. as well as natural objects such as trees, grass etc. on top of the terrain surface. In this paper we have proposed an integrated approach for effective out-of-core visualization of terrains populated with large collection of static heterogeneous objects. We have developed an efficient tile-based out-of-core view-dependent Level of Detail (LOD) mesh simplification algorithm for real-time rendering of large terrains. Instead of manipulating individual triangles, the algorithm operates on clusters of geometry called blocks of aggregate triangles. Hence the amount of work CPU must perform is greatly reduced. The formation of long triangle strips for LOD blocks also solves the CPU-to-Card bandwidth problem. The tile-based multiresolution terrain geometry framework has been extended to support large satellite or aerial imagery textures. To display large collection of objects over the terrain while maintaining the real-time frame rate, an efficient object handling method has been proposed using paging technique and object instantiation. User is allowed to control the objects locations, scales and orientations. The algorithms have been implemented using Visual C++ and OpenGL 3D API and successfully tested on different real-world height maps and satellite phototextures of sizes upto 16K* 16K coupled with thousands of static objects on PCs.

关键词： terrain visualization out-of-core algorithms multiresolution modeling view-dependent refinement

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Developing improved metamodels by combining phenomenological reasoning with statistical methods

Developing improved metamodels by combining phenomenological...

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6th Conference on Enabling Technologies for Simulation Science

作者： Bigelow, JH Davis, PK RAND Corp Santa Monica CA 90406 USA

ISBN: (纸本)0819444669

A metamodel is relatively small, simple model that approximates the "behavior" of a large, complex model. A common and superficially attractive-way to develop a metamodel is to generate "data" from a number of large-model runs and to then use off-the-shelf statistical methods without attempting to understand the model's internal workings. This paper describes research illuminating why it is important and fruitful, in some problems, to improve the quality of such metamodels by using various types of phenomenological knowledge. The benefits are sometimes mathematically subtle, but strategically important, as when one is dealing with a system that could fail if any of several critical components fail. Naive metamodels may fail to reflect the individual criticality of such components and may therefore be quite misleading if used for policy analysis. Naive metamodeling may also give very misleading results on the relative importance of inputs, thereby skewing resource-allocation decisions. By inserting an appropriate dose of theory, however, such problems can be greatly mitigated. Our work is intended to be a contribution to the emerging understanding of multiresolution, multiperspective modeling (MRMPM), as well as a contribution to interdisciplinary work combining virtues of statistical methodology with virtues of more theory-based work. Although the analysis we present is based on a particular experiment with a particular "large and complex model," we believe that the insights are more general.

关键词： metamodel multiresolution modeling model abstraction response surfaces repro model multimodel statistics regression

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A Novel and Robust Algorithm to Model Handwriting Skill for Haptic Applications

A Novel and Robust Algorithm to Model Handwriting Skill for ...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Li, X. Srimathveeravalli, G. Singla, P. Kesavadas, T. SUNY Buffalo Dept Mech & Aerosp Engn Buffalo NY 14260 USA

ISBN: (纸本)9781424427932

A necessary step to building effective writing skill training system requires developing good methods for modeling human skill adequately. A number of groups have represented character information in various languages for writing skill based on trajectory information. These methods are often data intensive, tedious to implement and do not encode force information. To overcome these restrictions a novel present a novel modeling methodology that has good accuracy, robustness, flexibility and encodes force information involved in writing characters. This modeling methodology, based on Global-Local Approximation technique, has the capability to provide temporal force or position information independent of time, decoupling velocity information of the sample data used to capture skilled tasks. This modeling approach can be extended many human skilled tasks such as surgery, art and sports

关键词： multiresolution modeling haptics virtual reality training handwriting calligraphy human motor skill

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Study on Real-Time Interaction Method to Computer Graphics Clusters for Virtual Manufacturing

Study on Real-Time Interaction Method to Computer Graphics C...

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4th IEEE Conference on Industrial Electronics and Applications

作者： Gao Xin Jia Qing-xuan Sun Han-xu Song Jing-zhou Beijing Univ Posts & Telecommun Sch Automat Beijing 100876 Peoples R China

ISBN: (纸本)9781424427994

The paper describes a framework for time-critical rendering of graphics scenes composed of a large number of objects having complex geometric descriptions. An algorithm for mesh simplification both view-independent and view-dependent for original complex model was presented in this paper, First this paper uses edge collapse method with discrete curvature error metric to construct multi-resolution models, then simplified models were provided to view-dependent progressive transmission method to deal with, and implement it with a immediate-mode/retained-mode hybrid distributed parallel rendering system for virtual manufacturing;While this paper use the algorithm called geometry indexing that avoids the redundant geometry transmission by indexing geometry data, alleviating network bandwidth bottleneck.

关键词： virtual manufacturing distributed parallel rendering multiresolution modeling discrete curvature backface culling geometry indexing

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FastMesh: Efficient view-dependent meshing 9

FastMesh: Efficient view-dependent meshing

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9th Pacific Conference on Computer Graphics and Applications (Pacific Graphics 01)

作者： Pajarola, R Univ Calif Irvine Irvine CA 92697 USA

ISBN: (纸本)0769512275

In this paper we present an optimized view-dependent meshing framework for adaptive and continuous level-of-detail (LOD) rendering in real-time. multiresolution triangle mesh representations are an important tool for adapting triangle mesh complexity in real-time rendering environments. Ideally for interactive visualization, a triangle mesh is simplified to the maximal tolerated perceptual error, and thus mesh simplification is view-dependent. This paper introduces an efficient hierarchical multiresolution triangulation framework based on a half-edge triangle mesh data structure, and presents an optimized computation of several view-dependent error metrics within that framework providing conservative error bounds. The presented approach called FastMesh, is highly efficient both in space and time cost, and it spends only a fraction of the time required for rendering to perform the error calculations and dynamic mesh updates.

关键词： level-of-detail multiresolution modeling mesh simplification interactive rendering

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Model abstraction and the simulation sandbox

Model abstraction and the simulation sandbox

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6th Conference on Enabling Technologies for Simulation Science

作者： Trevisani, DA Sisti, AF Mayhew, MJ USAF Res Lab Informate Directorate Rome NY 13441 USA

ISBN: (纸本)0819444669

The Air Force Hierarchy of Models, often referred to as the "Great Pyramid", depicts the four disparate levels of resolution in which models are typically categorized. These levels range from an Engineering/Component level at the bottom, to Theater/Campaign level at the apex of the pyramid. Today, the landscape of simulations has evolved from uni-purpose, stove-piped simulations to those that provide a Joint Vision encompassing a much broader scope. Within the simulation community, there exists the desire for model reuse, particularly when it involves the reuse of validated legacy codes. Much effort has been put forth to integrate existing models into a federated system. Integrating models of similar resolution is difficult enough;yet, even more difficult is the more prevalent situation where models are represented at different levels of resolution. Often referred to as Mixed Resolution modeling (or multiresolution modeling), it is arguably the most pressing problem facing the simulation research community today.

关键词： mixed resolution modeling multiresolution modeling model abstraction hierarchical simulation

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