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pacific conference on computer graphics and applications

作者： Ke Deng Jingdan Zhang Lifeng Wang Baining Guo Microsoft Research Asia Beijing China Tsinghua University Beijing China

ISBN: (纸本)0769517846

In this paper we describe a new method to map a texture on a surface with a spatially-variant filter. Our filter takes into consideration the effects of anisotropy using a Jacobian approximation while computing the sampling rate, and the interpolation weights are computed with a sinc function. We also discuss how to do forward and backward mapping with the filter and extend our algorithms to 3D meshes. Our experimental results verify our analysis.

关键词： Jacobian matrices Kernel Filters Sampling methods Frequency Image sampling Asia Surface texture Filtering computer graphics

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Non-distorted texture mapping using variational interpolation

Non-distorted texture mapping using variational interpolatio...

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pacific conference on computer graphics and applications

作者： Ying Tang Hujun Bao F.Y. Mong Qunsheng Peng State Key Laboratory of CAD&CG University of Zhejiang China

ISBN: (纸本)0769508685

Presents a new efficient texture mapping algorithm for polygonal meshes. Texture coordinates are assigned to the vertices of the mesh using the variational interpolation technique. For each patch to be mapped, the algorithm first samples equidistantly the boundaries of the patch. In order to decrease distortion, the patch is further sampled as uniformly as possible while its texture domain are correspondingly sampled. The variational interpolation technique is then invoked to yield a parameterization of the patch. The experimental results demonstrate that the algorithm has a great number of potential applications in texture mapping and surface modeling.

关键词： Interpolation Surface texture Scattering parameters Mesh generation computer science Application software Image texture Rendering (computer graphics) Sampling methods Shape

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Progressive 3D reconstruction from a sketch drawing

Progressive 3D reconstruction from a sketch drawing

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pacific conference on computer graphics and applications

作者： Beom-Soo Oh Chang-Hun Kim Department of Computer Science and Engineering Korea University Seoul South Korea

ISBN: (纸本)0769512275

The paper presents a progressive algorithm for reconstructing a 3D structure from a given 2D sketch drawing (edge-vertex graph without hidden line removal) according to the user's sketch order. While previous methods reconstruct a 3D structure at once, the proposed method progressively calculate a 3D structure by optimizing the coordinates of vertices of an object according to the sketch order. The progressive method reconstructs the most plausible 3D object quickly by applying 3D constraints that are derived from the relationship between the object and the sketch drawing in the optimization process. Furthermore, it allows the user to change viewpoint during sketching, and also minimize distortion of an object by refining inaccurate sketch drawings. The progressive reconstruction algorithm is discussed, and examples from a working implementation are given.

关键词： Image reconstruction Image restoration Engineering drawings Optimization methods Constraint optimization Reconstruction algorithms Product design computer science computer interfaces Design automation

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Discontinuous free form deformations

Discontinuous free form deformations

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pacific conference on computer graphics and applications

作者： S. Schein G. Elber Computer Science Department Technion-Israel Institute of Technology Haifa Israel

Contemporary deformation tools let designers modify the geometry of deformed models. This approach can be restrictive if the designer wants to incorporate holes or gaps into a model while deforming it into a different shape. This work presents a variant of FFD that would let the designer incorporate isoparametric discontinuities into the deformation function. The input model is automatically split at these discontinuities, allowing the deformed model to reflect topological discontinuity changes. We demonstrate the deformation algorithm using two different applications. The first application wraps a moving model around obstacles in a scene, splitting and then reforming it. The second application works locally, enabling the end-user to insert arbitrarily shaped cuts into the surface of the model.

关键词： Deformable models Solid modeling Application software computer science Layout computer graphics Topology Shape control Computational geometry Terminology

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Incremental Deformation Subspace Reconstruction

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computer graphics FORUM 2016年第7期35卷 169-178页

作者： Mukherjee, R. Wu, X. Wang, H. Ohio State Univ Columbus OH 43210 USA

Recalculating the subspace basis of a deformable body is a mandatory procedure for subspace simulation, after the body gets modified by interactive applications. However, using linear modal analysis to calculate the basis from scratch is known to be computationally expensive. In the paper, we show that the subspace of a modified body can be efficiently obtained from the subspace of its original version, if mesh changes are small. Our basic idea is to approximate the stiffness matrix by its low-frequency component, so we can calculate new linear deformation modes by solving an incremental eigenvalue decomposition problem. To further handle nonlinear deformations in the subspace, we present a hybrid approach to calculate modal derivatives from both new and original linear modes. Finally, we demonstrate that the cubature samples trained for the original mesh can be reused in fast reduced force and stiffness matrix evaluation, and we explore the use of our techniques in various simulation problems. Our experiment shows that the updated subspace basis still allows a simulator to generate visual plausible deformation effects. The whole system is efficient and it is compatible with other subspace construction approaches.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.7 [computer graphics]: Three-Dimensional graphics and Realism—Animation

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Simple and Efficient Mesh Editing with Consistent Local Frames

Simple and Efficient Mesh Editing with Consistent Local Fram...

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pacific conference on computer graphics and applications

作者： Nikolas Paries Patrick Degener Reinhard Klein Institute of Computer Science II University of Bonn Germany

ISBN: (纸本)9780769530093;0769530095

Mesh editing methods based on differential surface representations are known for their efficiency and ease of implementation. For reconstruction from such representations, local frames have to be determined which is a nonlinear problem. In linear approximations frames can either degenerate or become inconsistent with the geometry. Both results in contra-intuitive deformations. Existing nonlinear approaches, however, are comparatively slow and considerably more complex. In this paper we present a differential representation that implicitly enforces orthogonal and geometry consistent frames while allowing a simple and efficient implementation. In particular, it enforces conformal surface deformations preserving local texture features.

关键词： Surface reconstruction Geometry Laplace equations Linear approximation Shape computer graphics Application software computer science Surface texture Reconstruction algorithms

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Interactive construction of multi-segment curved handles

Interactive construction of multi-segment curved handles

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pacific conference on computer graphics and applications

作者： V. Srinivasan E. Akleman Jianer Chen Visualization Science Program Texas A and M University USA Department of Computer Science Texas A and M University USA

In this work, we present a method to interactively create multi-segment, curved handles between two star-shaped faces of an orientable 2-manifold mesh or to connect two 2-manifold meshes along such faces. The presented algorithm combines a very simple 2D morphing algorithm with Hermite interpolation to construct the handle. Based on the method, we have developed a user interface tool that allows users to simply and easily create multi-segment curved handles.

关键词： Shape computer graphics User interfaces Joining processes Mathematical model Visualization computer science Interpolation Algorithm design and analysis Application software

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Optimizing network 3D data transmissions for interactive applications

Optimizing network 3D data transmissions for interactive app...

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pacific conference on computer graphics and applications

作者： I. Harada H. Sato H. Kitazawa NTT Lifestyle and Environmental Technology Laboratories Japan

3D object data transfer was optimized to accelerate interactive 3D scene design and virtual-space layout applications. In these applications, downloading many 3D objects reduces the interactivity of the clients. We used level-of-detail based loading sequences and timing control methods to interleave data downloading and interactions. Experiments showed that the maximum interval between interactions was up to 6.42 times shorter.

关键词： Research and development Local area networks Wide area networks Layout Poles and towers Design optimization Application software Timing Data visualization

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Advances in Multimedia Information Processing – PCM 2013 1

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丛书名： Lecture Notes in computer Science

1000年

作者： Benoit Huet Chong-Wah Ngo Jinhui Tang Zhi-Hua Zhou Alexander G. Hauptmann Shuicheng Yan

ISBN: (数字)9783319037318

ISBN: (纸本)9783319037301

This book constitutes the proceedings of the 14th pacific-Rim conference on Multimedia, PCM 2013, held in Nanjing, China, in December 2013. The 30 revised full papers and 27 poster papers presented were carefully reviewed and selected from 153 submissions. The papers cover a wide range of topics in the area of multimedia content analysis, multimedia signal processing and communications and multimedia applications and services.

关键词： Multimedia Information Systems Information Systems applications (incl. Internet) computer Imaging, Vision, Pattern Recognition and graphics Data Mining and Knowledge Discovery User Interfaces and Human computer Interaction Software Engineering

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Topology recognition of 3D closed freeform objects based on topological graphs

Topology recognition of 3D closed freeform objects based on ...

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pacific conference on computer graphics and applications

作者： D. Steiner A. Fischer CMSR Laboratory for Computer Graphics and CAD Department of Mechanical Engineering Technion-Israel Institute of Technology Haifa Israel

ISBN: (纸本)0769512275

Reverse engineering (RE) deals with an enormous number of irregular and scattered digitized points that require intensive processing in order to reconstruct the surfaces of an object. Surface reconstruction of freeform objects is based on geometrical and topological criteria. Current fitting methods reconstruct an object using a bottom-up approach, from points to a dense mesh, and finally into smoothed connected freeform sub-surfaces. This type of reconstruction, however, can cause topological problems that lead to undesired surface fitting results. Such problems are particularly common with concave shapes. To avoid problems of this type, the paper proposes a new method that automatically detects the topological structure of an object as a base for surface fitting. The topological reconstruction method described in the paper is based on two stages: (1) creating 3D non-self-intersecting iso-curves from a 3D triangular mesh and (2) extracting a topological graph. The feasibility of the proposed topological reconstruction method is demonstrated on several examples using freeform objects with complex topologies.

关键词： Topology Surface fitting Surface reconstruction Shape Reconstruction algorithms Reverse engineering Laboratories computer graphics Mechanical engineering Scattering

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