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Sit & Relax: Interactive Design of Body-Supporting Surfaces

computer graphics FORUM 2018年第7期37卷 349-359页

作者： Leimer, Kurt Birsak, Michael Rist, Florian Musialski, Przemyslaw TU Wien GCD Vienna Austria

We propose a novel method for interactive design of well-fitting body-supporting surfaces that is driven by the pressure distribution on the body's surface. Our main contribution is an interactive modeling system that utilizes captured body poses and computes an importance field that is proportional to the pressure distribution on the body for a given pose. This distribution indicates where the body should be supported in order to easily hold a particular pose, which is one of the measures of comfortable sitting. Using our approximation, we propose the entire workflow for interactive design of C-2 smooth surfaces which serve as seats, or generally, as body supporting furniture for comfortable sitting. Finally, we also provide a design tool for Rhinoceros/Grasshopper that allows for interactive creation of single designs or entire multi-person sitting scenarios. We also test the tool with design students and present several results. Our method aims at interactive design in order to help designers to create appropriate surfaces digitally without additional empirical design passes.

关键词： CCS Concepts •Applied computing → computer‐aided design •Computing methodologies → Mesh geometry models

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The intersection of two ringed surfaces 8

The intersection of two ringed surfaces

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8th pacific conference on computer graphics and applications

作者： Heo, HS Hong, SJ Kim, MS Elber, G POSTECH Dept Comp Sci Pohang 790784 South Korea

ISBN: (纸本)0769508685

We present an efficient and robust algorithm to compute the intersection curve of two ringed surfaces, each being the sweep boolean OR C-u(u) generated by a moving circle. Given two ringed surfaces boolean OR C-u(1)u and boolean OR C-u(2)v, we formulate the condition C-1(u) boolean AND C-2(v) not equal empty set (i.e. that the intersection of the two circles C-1(u) and C-2(v) is non-empty) as a bivariate equation lambda (u, v) = 0 of relatively low degree. Except for some redundant solutions and degenerate cases, there is a rational map from each solution of lambda (v, v) = 0 to the intersection point C(1)(u)boolean ANDC(2)(v). Thus it is trivial to construct the intersection curve once we have computed the zero-set of lambda (u, v) = 0. We also analyze some exceptional cases and consider how to construct the corresponding intersection curves.

关键词： computer science Equations Irrigation Ray tracing Robustness Shape Solids

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The Layerizing VoxPoint Annular Convolutional Network for 3D Shape Classification

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computer graphics FORUM 2020年第7期39卷 291-300页

作者： Wang, Tong Tao, Wenyuan Own, Chung-Ming Lou, Xiantuo Zhao, Yuehua Tianjin Univ Coll Intelligence & Comp Tianjin 300350 Peoples R China Hebei Univ Technol Sch Elect & Informat Engn Tianjin 300401 Peoples R China

Analyzing the geometric and semantic properties of 3D point cloud data via the deep learning networks is still challenging due to the irregularity and sparsity of samplings of their geometric structures. In our study, the authors combine the advantage of voxels and point clouds by presenting a new data form of voxel models, called Layer-Ring data. This data type can retain the fine description of the 3D data, and keep the high efficiency of feature extraction. After that, based on the Layer-Ring data, a modern network architecture, called VoxPoint Annular Network (VAN), works on the Layer-Ring data for the feature extraction and object category prediction. The design idea is based on the edge-extraction and the coordinate representation for each voxel on the separated layer. With the flexible design, our proposed VAN can adapt to the layer's geometric variability and scalability. Finally, the extensive experiments and comparisons demonstrate that our approach obtained the notable results with the state-of-the-art methods on a variety of standard benchmark datasets (e.g., ModelNet10, ModelNet40). Moreover, the tests also proved that 3D shape features could learn efficiently and robustly.

关键词： CCS Concepts • Computing methodologies → computer vision

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Practitioners' assessment of light reflection models

Practitioners' assessment of light reflection models

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Proceedings of the 1997 5th pacific conference on computer graphics and applications

作者： Shirley, Peter Smits, Brian Hu, Helen Lafortune, Eric Univ of Utah Salt Lake City United States

We discuss the theory and practical issues behind creating reflection models to show the difficulty of the problem. We survey the current approaches towards reflection models for computer graphics to show that even for simple surfaces, the important issues are far from settled. We briefly discuss future directions for research. Finally, we present a case study of a particular type of light reflection that captures some important aspects of appearance for a limited class of materials with subsurface reflection.

关键词： computer graphics

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Progressive geometry compression for meshes 8

Progressive geometry compression for meshes

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8th pacific conference on computer graphics and applications

作者： Liu, XG Bao, HJ Heng, PA Wong, TT Sun, HQ Peng, QS State Key Lab. of CAD and CG Zhejiang Univ. China Department of Computer Science and Engineering Chinese University of Hong Kong Hong Kong

ISBN: (纸本)0769508685

A novel progressive geometry compression scheme is presented in the paper. In this scheme a mesh is represented as a base mesh followed by some groups of vertex split operations using an improved simplification method, in which each level of the mesh can be refined into the next level by carrying out a group of vertex split operations in any order. Consequently, the PM representation can be effectively encoded by permuting the vertex split operations in each group. Meanwhile, a geometry predicator using Laplacian operator is designed to predict each new vertex position using its neighbors. The correction is quantized and encoded using Huffman coding scheme. Experimental results show that our algorithm obtains higher compression ratios than the previous work. It is very suitable for progressive transmission of geometry models over Internet.

关键词： triangular mesh geometry compression manifold surface progressive mesh

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Point-augmented bi-cubic subdivision surfaces

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computer graphics FORUM 2022年第7期41卷 13-23页

作者： Karciauskas, K. Peters, J. Vilnius Univ Vilnius Lithuania Univ Florida Gainesville FL 32611 USA

Point-Augmented Subdivision (PAS) replaces complex geometry-dependent guided subdivision, known to yield high-quality surfaces, by explicit subdivision formulas that yield similarly-good limit surfaces and are easy to implement using any subdivision infrastructure: map the control net d augmented by a fixed central limit point C, to a finer net ((d) over tilde ,C) = M(d,C), where the subdivision matrix M is assembled from the provided stencil Tables. Point-augmented bi-cubic subdivision improves the state of the art so that bi-cubic subdivision surfaces can be used in high-end geometric design: the highlight line distribution for challenging configurations lacks the shape artifacts usually associated with explicit iterative generalized subdivision operators near extraordinary points. Five explicit formulas define Point-augmented bi-cubic subdivision in addition to uniform B-spline knot insertion. Point-augmented bi-cubic subdivision comes in two flavors, either generating a sequence of C-2-joined surface rings (PAS2) or C-1-joined rings (PAS1) that have fewer pieces.

关键词： computer graphics

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computer graphics - more than beautiful images

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VISUAL computer 2005年第8-10期21卷 520-521页

作者： Seidel, HP MPI Informat Saarbrucken Germany

computers are being used more and more to model, simulate and render parts of the real or an imaginary world, and due to the importance of visual information for humans, computer graphics is at the very core of the technologies enabling the modern information society. New and emerging technologies such as multimedia, digital television, telecommunication and telepresence, virtual reality, or 3D Internet further indicate the tremendous potential of computer graphics in the years to come. Typical for the field is the coincidence of very large data sets with the demand for fast (if possible interactive) high-quality visual display of the results. Furthermore, the user should be able to interact with the environment in a natural and intuitive way.

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Injectivity conditions of 2D and 3D uniform cubic B-spline functions

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GRAPHICAL MODELS 2000年第6期62卷 411-427页

作者： Choi, Y Lee, S Pohang Univ Sci & Technol Dept Comp Sci & Engn Pohang 790784 South Korea

Uniform cubic B-spline functions have been used for mapping functions in various areas such as image warping and morphing, 3D deformation, and Volume morphing. The injectivity tone-to-one property) of a mapping function is crucial to obtaining desirable results in these areas. This paper considers the injectivity conditions of 2D and 3D uniform cubic B-spline functions. We propose a geometric interpretation of the injectivity of a uniform cubic B-spline function, with which 2D and 3D cases can be handled in a similar way. Based on our geometric interpretation, we present sufficient conditions for injectivity which are represented in terms of control point displacements. These sufficient conditions can be easily rested and will be useful in guaranteeing the injectivity of mapping functions in application areas. (C) 2000 Academic Press.

关键词： Three dimensional computer graphics

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Adaptive parameterization for reconstruction of 3D freeform objects from laser-scanned data 7

Adaptive parameterization for reconstruction of 3D freeform ...

引用

7th pacific conference on computer graphics and applications, pacific graphics 1999

作者： Fischer, A. Manor, A. Barhak, Y. CMSR Laboratory for Computer Graphics and CAD Department of Mechanical Engineering Technion - Israel Institute of Technology Haifa32000 Israel

ISBN: (纸本)0769502938

This paper proposes a new adaptive parametrization method to overcome the problems of using laser scanners in Reverse Engineering. The method is based on the following stages: (a) Detecting a 3D boundary of the parametric base surface by matching an intensity image from a CCD camera with the scanned data. (b) Adaptively reconstructing a parametric base surface with a non-self intersecting grid, based on a PDE method (c) Calculating the parametrization of the 3D sampled points. (d) Fitting the surface by applying a least square (LSQ) approximation method with boundary constraints. The feasibility of the parametrization algorithm is demonstrated on several examples using sculptured free objects. © 1999 IEEE.

关键词： Reverse engineering

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3D Body Shapes Estimation from Dressed-Human Silhouettes

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computer graphics FORUM 2016年第7期35卷 147-156页

作者： Song, Dan Tong, Ruofeng Chang, Jian Yang, Xiaosong Tang, Min Zhang, Jian Jun Zhejiang Univ Hangzhou Zhejiang Peoples R China Bournemouth Univ Poole Dorset England

Estimation of 3D body shapes from dressed-human photos is an important but challenging problem in virtual fitting. We propose a novel automatic framework to efficiently estimate 3D body shapes under clothes. We construct a database of 3D naked and dressed body pairs, based on which we learn how to predict 3D positions of body landmarks (which further constrain a parametric human body model) automatically according to dressed-human silhouettes. Critical vertices are selected on 3D registered human bodies as landmarks to represent body shapes, so as to avoid the time-consuming vertices correspondences finding process for parametric body reconstruction. Our method can estimate 3D body shapes from dressed-human silhouettes within 4 seconds, while the fastest method reported previously need 1 minute. In addition, our estimation error is within the size tolerance for clothing industry. We dress 6042 naked bodies with 3 sets of common clothes by physically based cloth simulation technique. To the best of our knowledge, We are the first to construct such a database containing 3D naked and dressed body pairs and our database may contribute to the areas of human body shapes estimation and cloth simulation.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.m [computer graphics]: Miscellaneous&mdash Image-based modeling

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