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Direct reconstruction of displaced subdivision surface from unorganized points

Direct reconstruction of displaced subdivision surface from ...

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pacific conference on computer graphics and applications

作者： Won Ki Jeong Chang Hun Kim Max Planck Institut für Informatik Saarbruecken Germany Department of Computer Science and Engineering Korea University Seoul South Korea

ISBN: (纸本)0769512275

We propose a new mesh reconstruction algorithm that produces a displaced subdivision mesh directly from unorganized points. The displaced subdivision surface is a new mesh representation that defines a detailed mesh with a displacement map over a smooth domain surface. This mesh representation has several benefits-compact mesh size, piecewise regular connectivity-to overcome limitations of an irregular mesh produced by an ordinary mesh reconstruction scheme, but the original displaced subdivision surface generation algorithm needs an explicit polygonal mesh to be converted. Our approach is producing displaced subdivision surface directly from input points during the mesh reconstruction process. The main ideas of our algorithm are building initial coarse control mesh by the shrink-wrapping like projection and sampling fine surface detail from unorganized points along the each limit vertex normal without any connectivity information of given points. We employ an existing subdivision surface fitting scheme to generate a parametric domain surface, and suggest a surface detail sampling scheme that determines a valid sampling triangle which can be made with combinations of input points. We show several reconstruction examples and applications to show the validity of suggested sampling technique and benefits of the result like multiresolution modeling.

关键词： Surface reconstruction Sampling methods Reconstruction algorithms Surface fitting Clouds computer science Mesh generation Laser modes Probes computer graphics

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ISpace: interactive volume data classification techniques using independent component analysis

ISpace: interactive volume data classification techniques us...

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pacific conference on computer graphics and applications

作者： I. Takanashi E.B. Lum Kwan-Liu Ma S. Muraki Mitsubishi Electric Corporation Information Technology Research and Development Center Japan CIPIC University of California Davis CA USA CIPIC & Department of Computer Science University of California Davis USA National Institute for Advanced Industrial Science and Technology Tsukuba Japan

This paper introduces an interactive classification technique for volume data, called ISpace, which uses Independent Component Analysis (ICA) and a multidimensional histogram of the volume data in a transformed space. Essentially, classification in the volume domain becomes equivalent to interactive clipping in the ICA space, which as demonstrated using several examples is more intuitive and direct for the user to classify data. The result is an opacity transfer function defined for rendering multivariate scalar volume data.

关键词： Independent component analysis Transfer functions Image segmentation Space technology Histograms Biomedical imaging Data visualization Rendering (computer graphics) Biological materials Information technology

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Density measure for line-drawing simplification

Density measure for line-drawing simplification

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pacific conference on computer graphics and applications

作者： S. Grabli F. Durand F.X. Sillion ARTIS/GRAVIR/IMAG-INRIA France MIT CSAIL USA

We present an approach for clutter control in NPR line drawing where measures of view and drawing complexity drive the simplification or omission of lines. We define two types of density information: the a-priori density and the causal density, and use them to control which parts of a drawing need simplification. The a-priori density is a measure of the visual complexity of the potential drawing and is computed on the complete arrangement of lines from the view. This measure affords a systematic approach for characterizing the structure of cluttered regions in terms of geometry, scale, and directionality. The causal density measures the spatial complexity of the current state of the drawing as strokes are added, allowing for clutter control through line omission or stylization. We show how these density measures permit a variety of pictorial simplification styles where complexity is reduced either uniformly, or in a spatially-varying manner through indication.

关键词： Density measurement Layout Focusing Geometry Current measurement Rendering (computer graphics) Photography Shape Vegetation mapping computer graphics

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Blending multiple views

Blending multiple views

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pacific conference on computer graphics and applications

作者： R. Raskar Kok-Lim Low Mitsubishi Electric Research Laboratories Inc. USA University of North Carolina Chapel Hill USA

Current blending methods in image-based rendering use local information such as "deviations from the closest views" to find blending weights. They include approaches such as the view-dependent texture mapping and blending fields used in unstructured lumigraph rendering. However, in the presence of depth discontinuities, these techniques do not provide smooth transitions in the target image if the intensities of corresponding pixels in the source images are significantly different (e.g. due to specular highlights). In this paper, we present an image blending technique that allows the use of global visibility and occlusion constraints. Each blending weight now has a global component and a local component, which are due to the view-independent and view-dependent contributions of the source images, respectively. Being view-independent, the global components can be computed in a preprocessing stage. Traditional graphics hardware is exploited to accelerate the computation of the global blending weights.

关键词： Cameras Layout Rendering (computer graphics) Pixel Geometry graphics Solid modeling Hardware Acceleration Interpolation

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Efficient coding of non-triangular mesh connectivity

Efficient coding of non-triangular mesh connectivity

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pacific conference on computer graphics and applications

作者： B. Kronrod C. Gotsman Computer Science Department Technion-Israel Institute of Technology Haifa Israel

Describes an efficient algorithm for coding the connectivity information of general polygon meshes. In contrast to most existing algorithms, which are suitable only for triangular meshes and pay a penalty for the treatment of non-triangular faces, this algorithm codes the connectivity information in a direct manner. Our treatment of the special case of triangular meshes is shown to be equivalent to the Edgebreaker algorithm. Using our methods, any triangle mesh may be coded in no more than two bits/triangle (approximately four bits/vertex), a quadrilateral mesh in no more than 3.5 bits/quad (approximately 3.5 bits/vertex), and the most common case of a quadrilateral mesh with few triangles in no more than four bits/polygon.

关键词： computer science Algorithm design and analysis Surgery Decoding Upper bound

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Simulation and control of physical phenomena in computer graphics

Simulation and control of physical phenomena in computer gra...

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pacific conference on computer graphics and applications

作者： J. Stam Alias Systems Toronto ONT Canada

In computer graphics applications such as feature animation and games there is a need to produce convincing simulations of phenomena such as smoke, water, cloth and rigid bodies. Computational physics is the natural framework for such simulations. The physical equations describing most of these phenomena are well known and have been extensively studied over the last couple of centuries by the physics community. Which solution technique to use in practice depends on the application. In computer graphics it is desirable to have fast and stable simulations. Ideally, the simulations should run in realtime. This is important of course in games but also in movie production houses where animators have to fine tune the parameters of the simulation. On the other hand it is also desirable that these simulations are easy to implement. This makes the code easier to maintain in a commercial system. Our experience has been that good solutions very often result in simple algorithms which are relatively easy to code. This paper mainly focuses on the simulation of fluids such as smoke, water and fire. Our fluid solver which was first introduced in Stam (1999) relies on a spatial discretization of space into voxels. The physical quantities describing the fluid such as velocity and density are assumed to be constant in each voxel. These values are updated over each time step to create an animation of a fluid flow.

关键词： Computational modeling computer simulation computer graphics Animation Application software Physics computing Equations Motion pictures Production Fires

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Line Drawing as a Dynamic Process

Line Drawing as a Dynamic Process

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pacific conference on computer graphics and applications

作者： Donald H. House Mayank Singh Visualization Laboratory Texas A&M University Texas USA

We introduce a novel mechanism for creating line drawings from three-dimensional models, which captures the dynamic nature of the drawing process. The approach takes into account the interaction between the moving human hand and the drawing instrument. This is demonstrated as applied to the specific problem of making silhouette drawings from polygonal models. A control system drives a pen by tracking the contour of the polygonal model as projected onto the drawing surface, thus mimicking hand motion. The pen is treated as a physically-based object with momentum, giving the generated lines a smooth hand-drawn quality. Lines are rendered using a ribbon metaphor, where thickness is determined by the twist of the ribbon. The twist angle can be dependent upon various attributes such as perspective depth, the curvature of the line, and the lighting of the model. A number of examples are presented, ranging from tightly controlled drawings to expressive gestural drawings.

关键词： Rendering (computer graphics) Instruments Shape Target tracking computer graphics Control system synthesis Surface treatment Application software Visualization Laboratories

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Global Illumination for Interactive Lighting Design Using Light Path Pre-Computation and Hierarchical Histogram Estimation

Global Illumination for Interactive Lighting Design Using Li...

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pacific conference on computer graphics and applications

作者： Yonghao Yue Kei Iwasaki Yoshinori Dobashi Tomoyuki Nishita University of Tokyo Japan Wakayama University Japan Hokkaido University Japan

ISBN: (纸本)9780769530093;0769530095

In this paper, we propose a fast global illumination solution for interactive lighting design. Using our method, light sources and the viewpoint are movable, and the characteristics of materials can be modified (assuming low-frequency BRDF) during rendering. Our solution is based on particle tracing (a variation of photon mapping) and final gathering. We assume that objects in the input scene are static, and pre-compute potential light paths for particle tracing and final gathering. To perform final gathering fast, we propose an efficient technique called Hierarchical Histogram Estimation for rapid estimation of radiances from the distribution of the particles. The rendering process of our method can be fully implemented on the GPU and our method achieves interactive frame rates for rendering scenes with even more than 100,000 triangles.

关键词： Lighting Histograms Light sources Layout Acceleration computer graphics Rendering (computer graphics) Application software Monte Carlo methods Runtime

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Interactive global illumination in dynamic environments using commodity graphics hardware

Interactive global illumination in dynamic environments usin...

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pacific conference on computer graphics and applications

作者： M. Nijasure S. Pattanaik V. Goel University of Central Florida Orlando FL USA ATI Research Orlando FL USA

We present a system based on commodity graphics hardware for computing global illumination in dynamic scenes at interactive rates. We designed a progressive global illumination algorithm specifically to take advantage of current graphics hardware features. Our algorithm simulates the transport of light in synthetic environments by following the light emitted from the light source(s) through its multiple bounces on the surfaces of the scene. The entire algorithm runs on ATI's Radeon 9700 using vertex and fragment shaders, allowing us to compute and display a global illumination solution for reasonably complex scenes with moving objects and moving lights in approximately 250 milliseconds (4 frames per second).

关键词： Lighting graphics Hardware Layout Optical reflection Computational modeling Rendering (computer graphics) Interpolation Data structures Approximation algorithms

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Transplanting and Editing Animations on Skinned Meshes

Transplanting and Editing Animations on Skinned Meshes

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pacific conference on computer graphics and applications

作者： Yuntao Jia Wei-wen Feng Yizhou Yu Department of Computer Science University of Illinois at Urbana-Champaign USA Department of Computer Science University of Illinois at Urbana-Champaign

Skinned Mesh Animation (SMA) well approximates a mesh animation with extracted bones and their transformations. However, unlike skeleton, bones in SMA are not organized in hierarchies, thus they need mesh dependent translation vectors which prevent other sources of motion (i.e. skeletal animations, MoCAP, SMAs etc) from being applied to the skinned mesh. In this paper, we propose a new and fast method to transplant motion to skinned meshes. By efficiently solving a linear least-squares system, we can compute new translation vectors which enable the motion to work on the skinned mesh. Based on the same idea, we have also devised a SMA editing tool which allows users to edit frames of the SMA interactively. Furthermore, the editing can be propagated to all subsequent frames.

关键词： Animation Bones Vectors computer graphics Skeleton Application software computer science Large-scale systems Motion pictures computer industry

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