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A versatile interactive 3D brush model

A versatile interactive 3D brush model

引用

Proceedings - 12th pacific conference on computer graphics and applications, PG 2004

作者： Baxter, William V. Lin, Ming C. Univ. of N. Carolina at Chapel Hill Department of Computer Science Chapel Hill NC United States

ISBN: (纸本)0769522343

We present a flexible modeling approach capable of realistically simulating many varieties of brushes commonly used in painting. Our geometric model of brush heads is a combination of subdivision surfaces and hundreds of individual bristles represented by thin polygonal strips. We exploit bristle-to-bristle coherence, simulating only a fraction of the bristles and using interpolation for the remainder. Our dynamic model incorporates realistic physically-based deformation, including anisotropic friction, brush plasticity, and tip spreading. We use an energy minimization framework with a novel geometric representation of the brush head to generate a wider variety of brushes. Finally, we have developed an improved haptic model that provides realistic force feedback, directly related to the results of the brush dynamic simulation. Using this model, we are able to simulate a wide range of brush styles and create an excellent variety of strokes such as the crisp, curvy strokes of Western decorative painting, or rough scratchy strokes like certain Oriental calligraphy. We have also developed an exporter for a popular free 3D modeling package that makes it easier for non-programmers to create any desired style of brush, real or fanciful. © 2004 IEEE.

关键词： computer graphics

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Feature adaptive surfel set simplification 19

Feature adaptive surfel set simplification

引用

19th pacific conference on computer graphics and applications, PG 2011

作者： Huang, Yan Yan, Feihu Wang, Bei Peng, Jingliang School of Computer Science and Technology Shandong University China Intel Corporation

ISBN: (纸本)9783905673845

In this paper we propose a novel scheme for simplifying a surfel set with the resultant surfels computed and distributed in an effort to preserve prominent geometric and textural features with a reduced number of primitives. It works by iteratively collapsing local neighborhoods around surfels until a desired data reduction ratio is reached. The local neighborhood collapses are prioritized according to a cost metric that takes into account the local complexities of both the geometric and the textural information. Experimental results demonstrate that, besides yielding outstanding model quality at a reduced model size, the proposed scheme provides the flexibility for the users to specify the relative priorities in the geometric and the textural fidelity. © The Eurographics Association 2011.

关键词： Geometry

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On the effects of haptic display in brush and ink simulation for Chinese painting and calligraphy 10

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

引用

10th pacific conference on computer graphics and applications, PG 2002

作者： Yeh, Jeng-Sheng Lien, Ting-Yu Ouhyoung, Ming 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. © 2002 IEEE.

关键词： Viscosity

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Pairwise surface registration using local voxelizer 23

Pairwise surface registration using local voxelizer

引用

23rd pacific conference on computer graphics and applications, PG 2015

作者： Song, Peng Chen, Xiaoping School of Computer Science and Technology University of Science and Technology of China China

ISBN: (纸本)9783905674965

Surface registration is the process that brings scans into a common coordinate system by aligning their overlapping components, which can be achieved by finding a few pairs of matched points on each scan pair using shape descriptors and employing the matches to compute an alignment transformation. This paper proposes a local voxelizer descriptor, and the key idea is to define a unique local reference frame (LRF) using the local shape around a basis point, perform voxlization for the local shape within a cubical volume aligned with the LRF, and concatenate local features extracted from each voxel to construct the descriptor. A pairwise registration algorithm is developed by choosing a single pair of matched points using the local voxelizer descriptor, and computing a rigid transformation based on aligning the corresponding LRFs. Quantitative experiments show that our algorithm can register scan pairs with small overlap, while maintaining acceptable registration accuracy. © The Eurographics Association 2015.

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Visual analysis of FPS gameplay data: From game design to player behavior 22

Visual analysis of FPS gameplay data: From game design to pl...

引用

22nd pacific conference on computer graphics and applications, PG 2014

作者： Li, Quan Qu, Huamin Online Games Division NetEase Inc Department of Computer Science and Engineering Hong Kong University of Science and Technology Hong Kong

ISBN: (纸本)9783905674736

Gameplay data analysis has already become an important method for analyzing player behavior in games. Visualization is a promising way to explore and gain insight into the data. In this paper, we work closely with the game designers and user experience engineers to develop a visual analytic system to help them explore the gameplay data for a novel FPS (First-Person Shooter) game specific in the mainland China. We first come up with task specifications for such a system. After that, we propose a set of design goals for our system. VisFPS, is thus developed iteratively through a complete use-centered design process. The system is divided into two parts: Macro-View to deal with the overall gameplay data to discover patterns, and Micro-View to focus on a specific game match to recreate the game scene and use it to study player behavior and verify the game design intent. © The Eurographics Association 2014.

关键词： Game design

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Interactive graphical interface for an expert airload-planning system

Interactive graphical interface for an expert airload-planni...

引用

Proceedings of the Twenty-Second Annual Hawaii International conference on System Sciences: Emerging Technologies and applications Track

作者： Wong, Julie S. SRI Int Menlo Park CA USA

ISBN: (纸本)0818619147

A graphics systems is designed and implemented as an adjunct to an expert system for planning aircraft loading. This system is fully integrated with the expert system and is used to illustrate its planned airloads and to modify these loads interactively. Design considerations and key features of the graphics system are discussed. The graphics system has been deployed successfully and now widely accepted as a useful tool for airload planning and execution. Aspects of the system that could be improved are indicated.

关键词： computer graphics

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Bottom-up/top-down geometric object reconstruction with CNN classification for mobile education 26

Bottom-up/top-down geometric object reconstruction with CNN ...

引用

26th pacific conference on computer graphics and applications, pacific graphics 2018

作者： Guo, T. Cui, R. Qin, X. Wang, Y. Tang, Z. Peking University Institute of computer science and technology China

ISBN: (纸本)9783038680734

Geometric objects in educational materials are often illustrated as 2D line drawings, which results in the loss of depth information. To alleviate the problem of fully understanding the 3D structure of geometric objects, we propose a novel method to reconstruct the 3D shape of a geometric object illustrated in a line drawing image. In contrast to most existing methods, ours directly take a single line drawing image as input and generate a valid sketch for reconstruction. Given a single input line drawing image, we first classify the geometric object in the image with convolution neural network (CNN). More specifically, we pre-train the model with simulated images to alleviate the problems of data collection and unbalanced distribution among different classes. Then, we generate the sketch of the geometric object with our proposed bottom-up and top-down scheme. Finally, we finish reconstruction by minimizing an objective function of reconstruction error. Extensive experimental results demonstrate that our method performs significantly better in both accuracy and efficiency compared with the existing methods. © 2018 The Author(s).

关键词： Image classification

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Automatic animation skeleton using repulsive force field 11

Automatic animation skeleton using repulsive force field

引用

11th pacific conference on computer graphics and applications, PG 2003

作者： Liu, Pin-Chou Wu, Fu-Che Ma, Wan-Chun Liang, Rung-Huei Ouhyoung, Ming Communication and Multimedia Laboratory Dept. of Computer Science and Information Engineering National Taiwan University Taiwan

ISBN: (纸本)0769520286

A method is proposed in this paper to automatically generate the animation skeleton of a model such that the model can be manipulated according to the skeleton. With our method, users can construct the skeleton in a short time, and bring a static model both dynamic and alive. The primary steps of our method are finding skeleton joints, connecting the joints to form an animation skeleton, and binding skin vertices to the skeleton. Initially, a repulsive force field is constructed inside a given model, and a set of points with local minimal force magnitude are found based on the force field. Then, a modified thinning algorithm is applied to generate an initial skeleton, which is further refined to become the final result. When the skeleton construction completes, skin vertices are anchored to the skeleton joints according to the distances between the vertices and joints. In order to build the repulsive force field, hundreds of rays are shot radially from positions inside the model, and it leads to that the force field computation takes most of the execution time. Therefore, an octree structure is used to accelerate this process. Currently, the skeleton generated from a typical 3D model with 1000 to 10000 polygons takes less than 2 minutes on a Intel Pentium 4 2.4 GHz PC. © 2003 IEEE.

关键词： computer graphics

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Virtual city map generation using area subdivision 19

Virtual city map generation using area subdivision

引用

19th pacific conference on computer graphics and applications, PG 2011

作者： Müller, Kerstin Heischbourg, Luc Fünfzig, Christoph Petsch, Sebastian Hagen, Hans TU Kaiserslautern Computer Graphics Group Germany

ISBN: (纸本)9783905673845

In this paper we present a new approach to build typical street networks for urban and rural areas automatically. Most street networks have a characteristic appearance which is a mixture between a kind of a regular spreading of streets and various perturbations of the regular structure, e.g., caused by the terrain. Our City Map Generation (CMG) algorithm gets as input an height field including watercourses and restricted areas such as nature protection areas or mountain areas. Furthermore, the user can specify the urbanization by the number of city centers or by a density map. The CMG algorithm produces a street map for the given landscape based on rules, which the user can also modify to obtain an individual appearance. Additionally, the regular structure is varied by a set of rules incorporating randomness. The results can be used to generate models for city areas, e.g., in movies and commercials. Depending on the demands, our flexible approach can be adjusted to produce a variety of road maps automatically. We show some examples and demonstrate that our algorithm is easy to implement and to use. © The Eurographics Association 2011.

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Computing distances between surfaces using line geometry 10

Computing distances between surfaces using line geometry

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10th pacific conference on computer graphics and applications, PG 2002

作者： Sohn, Kyung-Ah Jüttler, Bert Kim, Myung-Soo Wang, Wenping School of Computer Science and Engineering Seoul National University Korea Republic of Institute of Analysis Dept. of Applied Geometry Johannes Kepler University of Linz Austria Dept. of Computer Science and Information Systems University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)0769517846

We present an algorithm for computing the distance between two free-form surfaces. Using line geometry, the distance computation is reformulated as a simple instance of a surface-surface intersection problem, which leads to low-dimensional root finding in a system of equations. This approach produces an efficient algorithm for computing the distance between two ellipsoids, where the problem is reduced to finding a specific solution in a system of two equations in two variables. Similar algorithms can be designed for computing the distance between an ellipsoid and a simple surface (such as cylinder cone, or torus). In an experimental implementation (on a 500 MHz Windows PC), the distance between two ellipsoids was computed in less than 0.3 msec on average;and the distance between an ellipsoid and a simple convex surface was computed in less than 0.15 msec on average. © 2002 IEEE.

关键词： Chromium

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