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A versatile hierarchical mesh for subdivision surfaces

IEEE Potentials 2008年第5期27卷 20-25页

作者： Fünfzig, Christoph Müller, Kerstin Janetzek, Rafael Techmann, Torsten PRISM Lab. Arizona State University United States PRISM Lab. Arizona State University Computer Graphics and Visualization University of Kaiserslautern Germany Darmstadt University of Technology Germany

The construction and processing of surface geometry can be done by connecting surface primitives to vertices, edges, and neighbors. The representation schemes of surface geometry are vertex-based, edge-based, and quad-edge-based. Catmull and Clark rule of subdivision includes three different rules to create new vertices in the refined control mesh, that are vertex, edge, and face subdivision rule. A new vertex can be created in the refined mesh as a convex combination of the vertices in the neighborhood of vertex, edge, and face in the control mesh. The first subdivision step has a quadrangle control mesh and number of vertices with valence unequal to four constant during refinement. The Charles Loop subdivision scheme is based on box spline and during a subdivision a triangle is divided into four triangles through vertex and edge subdivision rule.

关键词： Mesh generation

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PNG1 triangles for tangent plane continuous surfaces on the GPU

PNG1 triangles for tangent plane continuous surfaces on the ...

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graphics Interface 2008

作者： Fünfzig, Christoph Müller, Kerstin Hansford, Dianne Farin, Gerald PRISM Lab Arizona State University Tempe United States Computer Graphics and Visualization University Kaiserslautern Germany

ISBN: (纸本)9781568814230

Improving the visual appearance of coarse triangle meshes is usually done with graphics hardware with per-pixel shading techniques. Improving the appearance at silhouettes is inherently hard, as shading has only a small influence there and the geometry must be corrected. With the new geometry shader stage released with DirectX 10, the functionality to generate new primitives from an input primitive is available. Also the shader can access a restricted primitive neighborhood. In this paper, we present a curved surface patch that can deal with this restricted data available in the geometry shader. A surface patch is defined over a triangle with its vertex normals and the three edge neighbor triangles. Compared to PN triangles, which define a curved patch using just the triangle with its vertex normals, our surface patch is G1 continuous with its three neighboring patches. The patch is obtained by blending two cubic Bézier patches for each triangle edge. In this way, our surface is especially suitable for efficient, high-quality tessellation on the GPU. We show the construction of the surface and how to add special features such as creases. Thus, the appearance of the surface patch can be fine-tuned easily. The surface patch is easy to integrate into existing polygonal modeling and rendering environments. We give some examples using Autodesk Maya.

关键词： graphics processing unit

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Texture-based visualization of unsteady 3d flow by real-time advection and volumetric illumination

Texture-based visualization of unsteady 3d flow by real-time...

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作者： Weiskopf, Daniel Schafhitzel, Tobias Ertl, Thomas IEEE Computer Society Graphics Visualization and Usability Lab. School of Computing Science Simon Fraser University Burnaby BC V5A 1S6 Canada Institute of Visualization and Interactive Systems University of Stuttgart Universitätsstr. 38 70569 Stuttgart Germany

This paper presents an interactive technique for the dense texture-based visualization of unsteady 3D flow, taking into account issues of computational efficiency and visual perception. High efficiency is achieved by a 3D graphics processing unit (QPU)-based texture advection mechanism that implements logical 3D grid structures by physical memory in the form of 2D textures. This approach results in fast read and write access to physical memory, independent of GPU architecture. Slice-based direct volume rendering is used for the final display. We investigate two alternative methods for the volumetric illumination of the result of texture advection: First, gradient-based illumination that employs a real-time computation of gradients, and, second, line-based lighting based on illumination in codimension 2. In addition to the Phong model, perception-guided rendering methods are considered, such as cool/warm shading, halo rendering, or color-based depth cueing. The problems of clutter and occlusion are addressed by supporting a volumetric importance function that enhances features of the flow and reduces visual complexity in less interesting regions. GPU implementation aspects, performance measurements, and a discussion of results are included to demonstrate our visualization approach. © 2007 IEEE.

关键词： Data visualization

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Visualizing spray paint deposition in VR training

Visualizing spray paint deposition in VR training

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2007 IEEE Virtual Reality Conference, VR'07

作者： Daeseok, Kim Youngwoo, Yoon Sunyu, Hwang Geehyuk, Lee Jinah, Park Information and Communications University Electronics and Telecommunications Research Institute Computer Graphics and Visualization Lab. 119 Munjiro Yuseong-gu Daejeon 305-714 Korea Republic of Human-Computer Interaction Lab. 119 Munjiro Yuseong-gu Daejeon 305-714 Korea Republic of Virtual Reality Research Team 161 Gajeong-dong Yuseong-gu Daejeon 305-700 Korea Republic of

ISBN: (纸本)1424409055

We present a real-time simulation of spray painting incorporated into a VR environment as an alternative training system for ship-building industries. The system allows the user to try out a painting work on life-size structures with a spray gun. Our goal is to provide a trainee realistic painting experience in real-time as well as to represent the thickness of the deposited paint on the surface for evaluation of his performance. The Gaussian model is used for a painting deposition model, and texture mapping technique is utilized to provide efficient visual feedback. We also present effective collision detection methods for a volume of spray paint particles. ©2007 IEEE.

关键词： Interactive computer graphics

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Enhanced 3D interaction with augmented visual information

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16th International Conference on Artificial Reality and Telexistence, ICAT 2006

作者： Lee, Dongwook Park, Jinah Computer Graphics and Visualization Lab Digital Media Lab Information and Communications University 119 Munji-ro Yusong-gu Daejeon Korea Republic of

ISBN: (纸本)3540497765

As 3D graphics environment becomes the standards for most computer systems, it is natural to seek a 3D input device for manipulating an object in a 3D virtual world. Unlike 2D interface, however, 3D interface creates perceptual mismatches including depth perception problem. The objective of our research is to enhance the depth perception and 3D interaction by providing additional information based on the pictorial depth cues and interaction cues. In this paper, we investigated how to incorporate such cues. We designed two kinds of additional viewport that are to be placed on the top of the interaction window. One is a basic additional view with a different FOV, and the other is a compound view made up with 9 small sub-views with varying viewing direction. We also implemented two behaviors of the augmented view with respect to user interaction: Interactive Resizing and Holding-Z. Through a set of user performance tests, we have concluded that the basic additional view with Interactive Resizing and the additional compound view made statistically significant improvement on the performance of 3D interaction with a 3D input device. Keywords: Virtual Environment, Human computer Interaction. © 2006 Springer-Verlag Berlin/Heidelberg.

关键词： Virtual reality

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Punctuated simplification of man-made objects

Punctuated simplification of man-made objects

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作者： Jang, Justin Wonka, Peter Ribarsky, William Shaw, Christopher D. Georgia Institute of Technology GVU Center College of Computing Atlanta GA 30332 United States Arizona State University PRISM Dept. of Computer Science and Engineering Tempe AZ 85287 United States UNC Charlotte CS Dept. Charlotte Visualization Center Charlotte NC 28223 United States Simon Fraser University Surrey School of Interactive Arts and Technology 14-660 Central City Tower 13450 102 Ave Surrey BC V3T 5X3 Canada Graphics Visualization and Usability Center Georgia Institute of Technology PRISM Lab. ASU Department of Information Technology UNC Charlotte Charlotte Visualization Center IEEE Visualization and Graphics Technical Committee School of Interactive Arts and Technology Simon Fraser University Surrey

We present a simplification algorithm for manifold polygonal meshes of plane-dominant models. Models of this type are likely to appear in man-made environments. While traditional simplification algorithms focus on generality and smooth meshes, the approach presented here considers a specific class of man-made models. By detecting and classifying edge loops on the mesh and providing a guided series of binary mesh partitions, our approach generates a series of simplified models, each of which better respects the semantics of these kinds of models than conventional approaches do. A guiding principle is to eliminate simplifications that do not make sense in constructed environments. This, coupled with the concept of "punctuated simplification", leads to an approach that is both efficient and delivers high visual quality. Comparative results are given.

关键词： Object oriented programming

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2D/3D non-rigid registration of volumetric CT lung data using thin-plate spline

2D/3D non-rigid registration of volumetric CT lung data usin...

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7th International Workshop on Enterprise Networking and Computing in Healthcare Industry (HEALTHCOM 2005)

作者： Kim, J Park, J Digital Ocean and Virtual Environment Center Korea Ocean Research and Development Institute South Korea Computer Graphics and Visualization Lab. Information and Communications University South Korea

ISBN: (纸本)0780389409

In the medical image analysis for the human organs, non-rigid registration is necessary to properly register the local deformation. Especially for the dynamic organs like a heart and lungs, it is essential to process the registration method in three-dimensional space to track their through-plane motion. In this paper, we suggest the 2D/3D non-rigid registration method based on the. corresponding anatomical landmarks using thin-plate spline (TPS). By extending two-dimensional TPS, we developed 3D TPS and computed its bending energy function to register the local deformations of the volumetric time-varying lung CT data. Our experimental results show that our method is suitable for handling volumetric deformation with a small number of anatomical landmarks.

关键词： non-rigid registration deformable volumetric data medical image thin-plate spline and anatomical landmark

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VR - A reality check?

VR - A reality check?

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IEEE Virtual Reality 2005

作者： Smith, Randall C. Sandin, Dan Fisher, Brian D. Westin, Stephen H. General Motors R and D Electronic Visualization Lab. U. Illinois Chicago School of Interactive Arts and Technology Simon Fraser University Program of Computer Graphics Cornell University

Within the large spectrum of possible VR application areas, automotive applications were among the first to appear, and are among the most demanding. Technology has not been sufficiently sophisticated for many tasks. The troubling thought is that we are happy to push the technology envelope, but don't really know how useful this technology is, or can be. Could I do my job even if I had a real-time, ortho-stereoscopic, head-tracked, multi-viewer, wide-field-of-view, high-dynamic-range display with eye-limiting acuity?

关键词： Virtual reality

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Particle-based fluid-fluid interaction 05

Particle-based fluid-fluid interaction

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Proceedings of the 2005 ACM SIGGRAPH/Eurographics symposium on computer animation

作者： Müller, Matthias Solenthaler, Barbara Keiser, Richard Gross, Markus NovodeX AG Zürich AGEIA Inc. St. Louis United States Visualization and Multimedia Lab. University of Zürich Switzerland Computer Graphics Lab. ETH Zürich Switzerland

ISBN: (纸本)9781595931986

The interesting and complex behavior of fluids emerges mainly from interaction processes. While interactions of fluids with static or dynamic solids has caught some attention in computer graphics lately, the mutual interaction of different types of fluids such as air and water or water and wax has received much less attention although these types of interaction are the basis for a variety of important phenomena. In this paper we propose a new technique to model fluid-fluid interaction based on the Smoothed Particle Hydrodynamics (SPH) method. For the simulation of air-water interaction, air particles are generated on the fly only where needed. We also model dynamic phase changes and interface forces. Our technique makes possible the simulation of phenomena such as boiling water, trapped air and the dynamics of a lava lamp. © 2010 ACM.

关键词： Air

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Illustrative visualization

Illustrative visualization

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VIS 05: IEEE visualization 2005, Proceedings

作者： Viola, Ivan Gröller, Meister E. Hadwiger, Markus Bühler, Katja Preim, Bernhard Sousa, Mario Costa Ebert, David S. Stredney, Don Kanitsar, Armin Bruckner, Stefan Grimm, Sören Svakhine, Nikolai A. Jang, Yun Gaithert, Kelly Tietjen, Christian Krüger, Arno Peitgen, Heinz-Otto Isenberg, Tobias Hintze, Jana Hertel, Ilka Strauß, Gero Institute of Computer Graphics and Algorithms Vienna University of Technology Austria VRVis Research Center Vienna Austria Department of Simulation and Graphics University of Magdeburg Germany Department of Computer Science University of Calgary Canada School of Electrical and Computer Engineering Purdue University United States Ohio Supercomputer Center United States Institute of Computer Graphics and Algorithms Vienna University of Technology Austria VRVis Research Center Vienna Austria Electrical and Computer Engineering Purdue University United States IEEE Austria Department of Computer Science University of Calgary Canada Department of Computer Science Computer Graphics Research Lab. University of Calgary Canada Purdue University United States Ohio Supercomputer Center United States University of Texas Austin United States Interface Laboratory United States Biomedical Applications United States Department of Simulation and Graphics Otto-von-Guericke-University of Magdeburg Germany Otto-von-Guericke-University of Magdeburg FIN/ISG Germany Institute for Simulation and Graphics Department for Computer Science Otto-von-Guericke-University of Magdeburg Universitaetsplatz 2 39106 Magdeburg Germany Center for Medical Diagnosic Systems and Visualization Universitaetsallee 29 28359 Bremen Germany Department of Simulation and Graphics Otto-von-Guericke University of Magdeburg Germany ENT Department University Hospital of Leipzig Germany

ISBN: (纸本)0780394623

The tutorial presents state-of-the-art visualization techniques inspired by traditional technical and medical illustrations. Such techniques exploit the perception of the human visual system and provide effective visual abstractions to make the visualization clearly understandable. Visual emphasis and abstraction has been used for expressive presentation from prehistoric paintings to nowadays scientific and medical illustrations. Many of the expressive techniques used in art are adopted in computer graphics, and are denoted as illustrative or non-photorealistic rendering. Different stroke techniques, or brush properties express a particular level of abstraction. Feature emphasis or feature suppression is achieved by combining different abstraction levels in illustrative rendering. Challenges in visualization research are very large data visualization as well as multi-dimensional data visualization. To effectively convey the most important visual information there is a significant need for visual abstraction. For less relevant information the dedicated image space is reduced to enhance more prominent features. The discussed techniques in the context of scientific visualization are based on iso-surfaces and volume rendering. Apart from visual abstraction, i.e., illustrative representation, the visibility of prominent features can be achieved by illustrative visualization techniques such as cut-away views or ghosted views. The structures that occlude the most prominent information are suppressed in order to clearly see more interesting parts. A different smart way to provide information on the data is using exploded views or other types of deformation. Furthermore intuitive feature classification via 3D painting and manipulation with the classified data including label placement is presented. Discussed non-photorealistic and illustrative techniques from visualization and graphics are shown from the perspective as tools for illustrators from medicine, botany, archeology

关键词： visualization

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