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A simple approach to interactive free-form shape deformations

A simple approach to interactive free-form shape deformation...

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pacific conference on computer graphics and applications

作者： S. Yoshizawa A.G. Belyaev H.-P. Seidel Max-Planck-Institut für Informatik Computer Graphics Group Saarbruecken Germany University of Aizu Japan

In this paper we propose a set of free-form shape deformation techniques. The basic approach can be described as follows. Given a surface represented by a mesh and a control point, for every mesh vertex let us consider the difference between the control point and the vertex. The vertex is shifted by a displacement equal to the difference, times a scale factor where the scale factor is given by a function depending nonlinearly on the difference. The function is bump-shaped and depends on a number of parameters. Varying the parameters leads to a rich palette of shape deformations. The proposed approach includes also shape deformations with multiple (real, auxiliary, and virtual) control points and constrained, directional, and anisotropic deformations. It allows a user to edit a given shape interactively and intuitively. No mesh connectivity information is used and, therefore, the proposed techniques can be applied directly to a shape given as a cloud of points.

关键词： Shape control Anisotropic magnetoresistance computer graphics Clouds Displacement control Visualization Gaussian processes Application software Reflection

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Combining 2D feature tracking and volume reconstruction for online video-based human motion capture

Combining 2D feature tracking and volume reconstruction for ...

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pacific conference on computer graphics and applications

作者： C. Theobalt M. Magnor P. Schuler H.-P. Seidel Max Planck Institut für Informatik Saarbruecken Germany

The acquisition of human motion data is of major importance for creating interactive virtual environments, intelligent user interfaces, and realistic computer animations. Today's performance of off-the-shelf computer hardware enables marker-free non-intrusive optical tracking of the human body. In addition, recent research shows that it is possible to efficiently acquire and render volumetric scene representations in real-time. This paper describes a system to capture human motion at interactive frame rates without the use of markers or scene-intruding devices. Instead, 2D computer vision and 3D volumetric scene reconstruction algorithms are applied directly to the image data. A person is recorded by multiple synchronized cameras, and a multilayer hierarchical kinematic skeleton is fitted to each frame in a two-stage process. We present results with a prototype system running on two PCs.

关键词： Tracking Humans Layout Image reconstruction Virtual environment User interfaces Animation Optical computing Hardware Rendering (computer graphics)

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The i-Cone/spl trade/ - a panoramic display system for virtual environments

The i-Cone/spl trade/ - a panoramic display system for virtu...

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pacific conference on computer graphics and applications

作者： A. Simon M. Gobel Virtual Environments Fraunhofer IMK Sankt Augustin Germany

We present the i-Cone/spl trade/ : a new projection-based panoramic display system for virtual environments. The i-Cone/spl trade/ uses conical screen geometry, resulting in optimized projector placement to create an extended workspace for standing participants in afront projection curved screen display with a very large continuous field of view. Improved acoustical properties of the conical screen geometry enable the use of immersive spatial audio. Combined with the excellent visual quality and homogeneity of a curved screen display, these properties make the i-Cone/spl trade/ an attractive display system for immersive virtual environments, suitable for larger audiences. Interaction paradigms and application examples for this new immersive display system are presented.

关键词： Large screen displays Virtual environment Auditory displays Geometry Ergonomics computer displays Acoustic distortion Head Brightness Collaboration

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Discrete differential error metric for surface simplification

Discrete differential error metric for surface simplificatio...

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pacific conference on computer graphics and applications

作者： Sun-Jeong Kim Soo-Kyun Kim Chang-Hun Kim Department of Computer Science and Engineering Korea University Seoul South Korea

ISBN: (纸本)0769517846

In this paper we propose a new discrete differential error metric for surface simplification. Many surface simplification algorithms have been developed in order to produce rapidly high quality approximations of polygonal models, and the quadric error metric based on the distance error is the most popular and successful error metric so far Even though such distance based error metrics give visually pleasing results with a reasonably fast speed, it is hard to measure an accurate geometric error on a highly curved and thin region since the error measured by the distance metric on such a region is usually small and causes a loss of visually important features. To overcome such a drawback, we define a new error metric based on the theory of local differential geometry in such a way that the first and the second order discrete differentials approximated locally on a discrete polygonal surface are integrated into the usual distance error metric. The benefits of our error metric are preservation of sharp feature regions after a drastic simplification, small geometric errors, and fast computation comparable to the existing methods.

关键词： Piecewise linear approximation Solid modeling computer errors Loss measurement Velocity measurement Shape computer science Geometry graphics Hardware

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引用

pacific conference on computer graphics and applications

作者： R. Ohbuchi T. Otagiri M. Ibato T. Takei Computer Science Department Yamanashi University Yamaguchi Japan Ibaraki Computing Center Incorporated Japan

In this paper, we propose a method for shape-similarity search of 3D polygonal-mesh models. The system accepts triangular meshes, but tolerates degenerated polygons, disconnected component, and other anomalies. As the feature vector, the method uses a combination of three vectors, (1) the moment of inertia, (2) the average distance of surface from the axis, and (3) the variance of distance of the surface from the axis. Values in each vector are discretely parameterized along each of the three principal axes of inertia of the model. We employed the Euclidean distance and the elastic-matching distance as the measures of distance between pairs of feature vectors. Experiments showed that the proposed shape features and distance measures perform fairly well in retrieving models having similar shape from a database of VRML models.

关键词： Statistics Solid modeling Content based retrieval Shape measurement Image converters Information retrieval computer science Euclidean distance Performance evaluation Spatial databases

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Compressing hexahedral volume meshes

Compressing hexahedral volume meshes

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pacific conference on computer graphics and applications

作者： M. Isenburg P. Alliez University of North Carolina Chapel Hill USA INRIA Sophia-Antipolis France

Unstructured hexahedral volume meshes are of particular interest for visualization and simulation applications. They allow regular tiling of the three-dimensional space and show good numerical behaviour in finite element computations. Beside such appealing properties, volume meshes take huge amount of space when stored in a raw format. We present a technique for encoding connectivity and geometry of unstructured hexahedral volume meshes. For connectivity compression, we extend the idea of coding with degrees as pioneered by Touma and Gotsman (1998) to volume meshes. Hexahedral connectivity is coded as a sequence of edge degrees. This naturally exploits the regularity of typical hexahedral meshes. We achieve compression rates of around 1.5 bits per hexahedron (bph) that go down to 0.18 bph for regular meshes. On our test meshes the average connectivity compression ratio is 1:162.7. For geometry compression, we perform simple parallelogram prediction on uniformly quantized vertices within the side of a hexahedron. Tests show an average geometry compression ratio of 1:3.7 at a quantization level of 16 bits.

关键词： Testing Finite element methods Data visualization Computational modeling Encoding Quantization computer industry Thermodynamics Computational geometry computer graphics

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Interactive rendering of translucent objects

Interactive rendering of translucent objects

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pacific conference on computer graphics and applications

作者： H.P.A. Lensch M. Goesele P. Bekaert J. Kautz M.A. Magnor Jochen Lang H.-P. Seidel Max Planck Institut für Informatik Saarbruecken Germany

This paper presents a rendering method for translucent objects, in which view point and illumination can be modified at interactive rates. In a preprocessing step the impulse response to incoming light impinging at each surface point is computed and stored in two different ways: The local effect on close-by surface points is modeled as a per-texel filter kernel that is applied to a texture map representing the incident illumination. The global response (i.e. light shining through the object) is stored as vertex-to-vertex throughput factors for the triangle mesh of the object. During rendering, the illumination map for the object is computed according to the current lighting situation and then filtered by the precomputed kernels. The illumination map is also used to derive the incident illumination on the vertices which is distributed via the vertex-to-vertex throughput factors to the other vertices. The final image is obtained by combining the local and global response. We demonstrate the performance of our method for several models.

关键词： computer graphics Lighting Optical scattering Light scattering Particle scattering Electrical capacitance tomography Throughput Biological materials Optical reflection Frequency

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On the effects of haptic display in brush and ink simulation for Chinese painting and calligraphy

On the effects of haptic display in brush and ink simulation...

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pacific conference on computer graphics and applications

作者： Jeng-sheng Yeh Ting-yu Lien Ming Ouhyoung Department of Computer Science and Information Engineering National Taiwan University Taiwan

ISBN: (纸本)0769517846

We develop an interactive haptic system, which can be a further aid for digital Chinese painting. When an artist is holding our force feedback device, one feels like holding a real painting brush with all the contact and bending forces, since the viscosity, friction, and the bending force of a brush touching the paper are simulated. First we derive a physical dynamics model as bending springs for bristles to construct a 3D brush. Then we simulate the ink-water transfer system for ink spreading and color blending. Our system is a real-time system and users can interact with it holding a digital brush supported by either a Phantom force feedback device or a "WACOM pressure sensing pen" on a tablet. A pilot experiment was conducted, and the results show that brush writing with haptic feedback is better than that of the same visual display but without haptic feedback.

关键词： Haptic interfaces Displays Brushes Ink Painting Force feedback Viscosity Friction Springs Real time systems

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Approximation with active B-spline curves and surfaces

Approximation with active B-spline curves and surfaces

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pacific conference on computer graphics and applications

作者： H. Pottmann S. Leopoldseder M. Hofer Institute of Geometry University of Technology Vienna Vienna Austria

An active contour model for parametric curve and surface approximation is presented. The active curve or surface adapts to the model shape to be approximated in an optimization algorithm. The quasi-Newton optimization procedure in each iteration step minimizes a quadratic function which is built up with the help of local quadratic approximants of the squared distance function of the model shape and an internal energy which has a smoothing and regularization effect. The approach completely avoids the parametrization problem. We also show how to use a similar strategy for the solution of variational problems for curves on surfaces. Examples are the geodesic path connecting two points on a surface and interpolating or approximating spline curves on surfaces. Finally we indicate how the latter topic leads to the variational design of smooth motions which interpolate or approximate given positions.

关键词： Spline Least squares approximation Character generation Application software Active contours Smoothing methods computer vision Polynomials Parameter estimation Geometry

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Analytic light transport approximations for volumetric materials

Analytic light transport approximations for volumetric mater...

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pacific conference on computer graphics and applications

作者： S. Premoze Department of Computer Science University of Utah USA

Subsurface scattering and light transport in volumetric media are critical to achieve a realistic depiction of a material. We describe several analytical approximations and methods for volumetric light transport in media of various optical properties that are efficient and easy to compute. Most natural materials exhibit a sudden surge in brightness called the opposition effect around the zero phase angle, where incident and viewing directions coincide. We present an approximation to the opposition effect in a particulate medium using a few physically realistic mathematical approximations. These analytical approximations can be used as tools or as a starting point for modeling the appearance of complex volumetric materials such as biological materials(skin, leaves) or inorganic materials (snow, clouds, rocks, paint). We demonstrate these approximations for several natural materials that exhibit substantial volumetric light transport and show how to use them to model complex materials.

关键词： Optical materials Biological materials Optical scattering Biological system modeling Inorganic materials Light scattering Biomedical optical imaging Optical computing Surges Brightness

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