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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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Optimizing the management of continuous level of detail models on GPU

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COMPUTERS & GRAPHICS-UK 2008年第3期32卷 307-319页

作者： Ripolles, O. Chover, M. Univ Jaume 1 Dept Lenguajes & Sistemas Informat Castellon de La Plana Spain

In this paper we present a new continuous multiresolution framework which has been developed in view of the outstanding evolution of hardware. Our interest not only focuses on exploiting GPUs possibilities, but also on making the best possible use of the capabilities offered by new bus technologies. On the one hand, we store the geometry, based on triangle strips, in high-performance memory on the GPU, offering fast rendering time. On the other hand, we have designed our level-of-detail extraction algorithm in order to make the most of current PCI Express bus characteristics, by sending the minimum information in the most appropriate way while taking into account the appearance of degenerate triangles. The results section shows that our model improves the efficiency of previously existing solutions. Its easy integration and its short extraction time make it suitable for game engines and graphics libraries which often resort to discrete models when it comes to selecting a multiresolution technique. (c) 2008 Elsevier Ltd. All rights reserved.

关键词： multiresolution modeling level of detail graphics hardware

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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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multiresolution modeling of arbitrary polygonal surfaces:: a characterization

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COMPUTERS & GRAPHICS-UK 2002年第3期26卷 449-462页

作者： Ribelles, J López, A Belmonte, O Remolar, I Chover, M Univ Jaume 1 Dept Lenguajes & Sistemas Infomat E-12080 Castellion Spain Univ Jaume 1 Dept Ingn & Ciencia Computadores E-12080 Castellion Spain

Recent technological advances have favored the apparition of highly detailed objects and, consequently, their availability for a wide diversity of applications. Normally, these objects are represented by means of complex polygonal surfaces formed by hundreds of thousands of polygons. which produce important increases in the costs of storage. transmission and visualization. multiresolution modeling, which allows an object to be represented by means of a set of approximations, each with a different number of polygons, has been successfully presented as a solution for the efficient manipulation of this type of objects. Although the first references to multiresolution modeling appeared more than 20 years ago, most of the multiresolution schemes specifically applied to polygonal surfaces have been proposed recently. This paper, after a brief review of multiresolution modeling, presents a characterization of the most interesting multiresolution schemes for arbitrary polygonal surfaces. The objective is to make the similarities and differences between them easily visible. With this aim. a series of characteristics is enumerated. These characteristics have commonly been used to define the multiresolution schemes and they are arranged together depending on whether they refer to the applications, to the input data or to the internal operation. (C) 2002 Elsevier Science Ltd, All rights reserved.

关键词： multiresolution modeling level of detail interactive visualization geometry compression progressive transmission

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Single-knot wavelets for non-uniform B-splines

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COMPUTER AIDED GEOMETRIC DESIGN 2005年第9期22卷 849-864页

作者： Bertram, M TU Kaiserslautern Kaiserslautern Germany

We propose a flexible and efficient wavelet construction for non-uniform B-spline curves and surfaces. The method allows to remove knots in arbitrary order minimizing the displacement of control points when a knot is re-inserted. Geometric detail subtracted from a shape by knot removal is represented by an associated wavelet coefficient replacing one of the control points at a coarser level of detail. From the hierarchy of wavelet coefficients, perfect reconstruction of the original shape is obtained. Both knot removal and insertion have local impact. Wavelet synthesis and analysis are both computed in linear time, based on the lifting scheme for biorthogonal wavelets. The method is perfectly suited for multiresolution surface editing, progressive transmission, and compression of spline curves and surfaces. (c) 2005 Elsevier B.V. All rights reserved.

关键词： multiresolution modeling hierarchical splines wavelet lifting

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Efficient implementation of real-time view-dependent multiresolution meshing

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IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS 2004年第3期10卷 353-368页

作者： Pajarola, R DeCoro, C Univ Calif Irvine Comp Graph Lab Irvine CA 92697 USA NYU Ctr Adv Technol Courant Inst Math Sci New York NY 10003 USA

In this paper, we present an efficient (topology preserving) multiresolution meshing framework for interactive level-of-detail (LOD) generation and rendering of large triangle meshes. More specifically, the presented approach, called FastMesh, provides view-dependent LOD generation and real-time mesh simplification that minimizes visual artifacts. multiresolution triangle mesh representations are an important tool for reducing triangle mesh complexity in interactive rendering environments. Ideally, for interactive visualization, a triangle mesh is simplified to the maximal tolerated visible error and, thus, mesh simplification is view-dependent. This paper introduces an efficient hierarchical multiresolution triangulation framework based oil a half-edge triangle mesh data structure and presents optimized implementations of several view-dependent or visual mesh simplification heuristics within that framework. Despite being optimized for performance, these error heuristics provide conservative error bounds. The presented framework is highly efficient both in space and time cost and needs 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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Wavelet-based multiresolution with ⁿ√2 subdivision

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COMPUTING 2004年第1-2期72卷 129-142页

作者： Linsen, L Pascucci, V Duchaineau, MA Hamann, B Joy, KI Univ Calif Davis Dept Comp Sci CIPIC Davis CA 95616 USA Lawrence Livermore Natl Lab Data Sci Grp CASC Livermore CA 94550 USA

multiresolution methods are a common technique used for dealing with large-scale data and representing it at multiple levels of detail. We present a multiresolution hierarchy construction based on (n)root2 subdivision, which has all the advantages of a regular data organization scheme while reducing the drawback of coarse granularity. The (n)root2-subdivision scheme only doubles the number of vertices in each subdivision step regardless of dimension n. We describe the construction of 2D, 3D, and 4D hierarchies representing surfaces, volume data, and time-varying volume data, respectively. The 4D approach supports spatial and temporal scalability. For high-quality data approximation on each level of detail, we use downsampling filters based on n-variate B-spline wavelets. We present a B-spline wavelet lifting scheme for (n)root2-subdivision steps to obtain small or narrow filters. Narrow filters support adaptive refinement and out-of-core data exploration techniques.

关键词： multiresolution modeling (time-varying) volume modeling subdivision B-spline wavelets data approximation

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Wavelet-based multiresolution with ⁿ√2 subdivision

Wavelet-based multiresolution with <SUP>n</SUP>√2 subdivisi...

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5th Dagstuhl Seminar on Geometric Modelling

作者： Linsen, L Pascucci, V Duchaineau, MA Hamann, B Joy, KI Univ Calif Davis Dept Comp Sci CIPIC Davis CA 95616 USA Lawrence Livermore Natl Lab Data Sci Grp CASC Livermore CA 94550 USA

关键词： multiresolution modeling (time-varying) volume modeling subdivision B-spline wavelets data approximation

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Confetti: Object-space point blending and splatting

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IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS 2004年第5期10卷 598-608页

作者： Pajarola, R Sainz, M Guidotti, P Univ Calif Irvine Dept Comp Sci Irvine CA 92697 USA Univ Calif Irvine Dept Math Irvine CA 92697 USA

In this paper, we present Confetti, a novel point-based rendering approach based on object-space point interpolation of densely sampled surfaces. We introduce the concept of a transformation-invariant covariance matrix of a set of points which can efficiently be used to determine splat sizes in a multiresolution point hierarchy. We also analyze continuous point interpolation in object-space and we define a new class of parameterized blending kernels as well as a normalization procedure to achieve smooth blending. Furthermore, we present a hardware accelerated rendering algorithm based on texture mapping and alpha-blending as well as programmable vertex and pixel-shaders.

关键词： point-based rendering multiresolution modeling level-of-detail hardware accelerated blending

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multiresolution modeling of hydro-thermal systems

Multiresolution modeling of hydro-thermal systems

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22nd International Conference on Power Industry Computer Applications

作者： Hindsberger, M Ravn, HF Elkraft Syst Ltd DK-2750 Ballerup Denmark

ISBN: (纸本)0780366816

This paper discusses how modeling and solution techniques can be combined in relation to solving large hydro-thermal models. It is discussed how detailed production unit data from a specific geographical area can be converted for use in a less-detailed model covering a larger geographical region. A computational case is included where the technique is used on the Nordic countries (large area, low resolution) including ELkraft System area (small area, high resolution).

关键词： hydro-thermal systems multiresolution modeling optimization approximation

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