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Visual design with Representation of Patterns Using Composition Graphs 1

20th International Conference on Cooperative design, Visualization and Engineering, CDVE 2023

作者： Grabska, Ewa Mars, Agnieszka Department of Design and Computer Graphics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Krakow Poland

ISBN: (数字)9783031438158

ISBN: (纸本)9783031438141

This paper concerns the computer-aided process of designing architectural objects in the form of 3D primitive configurations following the general-to-detail principle. design objects are represented by labeled specific graphs called composition graphs (CP-graphs) with nodes that have bonds to which edges are attached. The problem of grouping 3D design primitives in patterns with the possibility of their multiple uses is considered. This paper aims to show how to create equivalents of patterns at the level of CP-graphs and what possibilities this type of graph structure gives. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Graphic methods

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Three-Dimensional Bioprinting of Organs: Modern Trends

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Critical Reviews in Biomedical Engineering 2022年第3期50卷 19-34页

作者： Abbasov, Iftikhar B. Department of Engineering Graphics and Computer Design Southern Federal University Engineering-Technological Academy Taganrog Russia

The paper presents an overview of some modern technologies for three-dimensional (3D) bioprinting of human tissues and organs. 3D bioprinting of human organs is increasingly used for the production and transplantation of artificial biological organs. Existing technologies of 3D bioprinting using bioink on a special substrate are considered. The features of the production of bioinks using biocompatible polymer compounds, hydrogels are given, some popular modern bioprinters are noted. Modern technologies of bioprinting of tissues of human organs are considered: skin, liver, lungs, heart, brain, existing technological problems in this area are given. Based on the analysis, the future prospects for the development of bioprinting technology for human organs are noted. © 2022 by Begell House, Inc.

关键词： Hydrogels

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Creating 3D Asset Variations Through 2D Style Transfer and Generated Texture Maps

Creating 3D Asset Variations Through 2D Style Transfer and G...

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44th Annual Conference on European Association for computer graphics, EUROgraphics 2023

作者： Nikolov, I. Computer Graphics Group Faculty of Architecture Design and Media Technology Aalborg University Denmark

ISBN: (纸本)9783038682110

Generating 3D object variations through style transfer models applied to their textures is an easy way for creating content for games and XR applications. Most workflows focus on either generating albedo textures only without changing the underlying surface and not touching the underlying surface or transforming the 3D object directly, which is computationally and resource-heavy. In this paper, we present an initial exploration of an in-between solution that aims to combine the style transfer of albedo textures with the generation of additional maps, such as normal, displacement, and roughness. The results show that the pipeline can generate variations based on different styles, which would enable the addition of smaller 3D-style surface features to objects without transforming their meshes. The project code and generated textures will be available at https://***/IvanNik17/3D-Assets-From-2D-Style-Transfer. © 2023 The Authors.

关键词： Textures

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Live Feedback for Training Through Real-Time Data Visualizations: A Study with League of Legends

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Proceedings of the ACM on Human-computer Interaction 2022年第CHIPLAY期6卷 1–23页

作者： Rijnders, Frans Wallner, Günter Bernhaupt, Regina Department of Industrial Design Eindhoven University of Technology Eindhoven Netherlands Institute of Computer Graphics Johannes Kepler University Linz Linz Austria

With competitive gaming on the rise, players have developed an increased interest in data-driven feedback of their in-game performance. In many cases, this feedback is presented visually post-play but live companions that provide real-time analytics are gaining more and more attention. However, the design of such systems poses different requirements which have been little explored from a scholarly point of view. In this paper, we report on a study of two visualizations - a physical and digital one - providing live feedback to League of Legends players designed based on a community survey (N= 175) and expert input. We further discuss results of a qualitative evaluation with 13 players and an expert, touch upon potential benefits and drawbacks of physical and digital implementations, and present derived design considerations and challenges for such real-time data visualizations, revolving around issues of information density, contextualization, representation, and a diverse range of user needs. © 2022 ACM.

关键词： Visualization

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Light the Sprite: Pixel Art Dynamic Light Map Generation

Light the Sprite: Pixel Art Dynamic Light Map Generation

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46th Annual Conference on European Association for computer graphics, EUROgraphics 2025

作者： Nikolov, I. Computer Graphics Group Department of Architecture Design and Media Technology Aalborg University Denmark

ISBN: (纸本)9783038682684

Correct lighting and shading are vital for pixel art design. Automating texture generation, such as normal, depth, and occlusion maps, has been a long-standing focus. We extend this by proposing a deep learning model that generates point and directional light maps from RGB pixel art sprites and specified light vectors. Our approach modifies a UNet architecture with CIN layers to incorporate positional and directional information, using ZoeDepth for training depth data. Testing on a popular pixel art dataset shows that the generated light maps closely match those from depth or normal maps, as well as from manual programs. The model effectively relights complex sprites across styles and functions in real time, enhancing artist workflows. The code and dataset are here - https://***/IvanNik17/light-sprite. © 2025 The Authors.

关键词： Mapping

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Constructing the schematic and mathematical model of the dynamics of a vibratory drum separator 69

Constructing the schematic and mathematical model of the dyn...

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69th International Conference on Vibroengineering

作者： Rebot, Dariia Topilnytskyy, Volodymyr Svidrak, Inga Stotsko, Rostyslav Shevchuk, Anzhela Computer Design Systems Department Lviv Polytechnic National University Lviv Ukraine Department of Design Machine and Automotive Engineering Lviv Polytechnic National University Lviv Ukraine Department of Technical Mechanics and Engineering Graphics Lviv Polytechnic National University Lviv Ukraine

A structural diagram of a vibratory drum separator has been developed, and based on it, a mathematical model of the separator’s oscillatory motion has been constructed. The mathematical model was built using nonlinear mechanics methods and Lagrange equations. The obtained dependencies allow for determining the influence of geometric and physico-mechanical parameters on various factors affecting the intensity of the separation process. The research results should be used both at the design stages of vibratory separators and when selecting their parameters and operational modes. © 2024 Dariia Rebot, et al.

关键词： Separators

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Scale Perception in VR for Urban Scale Environments: 360° Photos versus Full 3D Virtual Reality 6

Scale Perception in VR for Urban Scale Environments: 360° P...

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6th International Conference on computer-Human Interaction Research and Applications, CHIRA 2022

作者： Madsen, Claus B. Steinø, Nicolai Lucaci, Andrei Iuliu Sandkvist, Emil O. Jonstrup, Alexander Computer Graphics Group Aalborg University Aalborg Denmark Urban Design Group Aalborg University Aalborg Denmark

ISBN: (纸本)9789897586095

The paper investigates the accuracy of scale perception in Virtual Reality (VR) for visualization of urban scale environments. Specifically, we evaluate users' scale estimation accuracy by subjecting them to an urban scale environment using two different viewing modes: 360° monoscopic panoramas viewed in a VR headset, versus a full stereoscopic 3D VR representation, also in a VR headset, allowing participants to move around. The paper explores various aspects of this, including both ego- and exo-centric distance estimation, perception of own height, and photographic realism of 360° modes. The main experimental result is that, somewhat surprisingly, user distance estimation accuracy is higher in the monoscopic 360° viewing modes than in 3D VR;in 3D VR participants on average underestimate distances by around 20%. Nevertheless, participants on average feel significantly taller than normal in the 360° modes, whereas they feel normal height in 3D VR mode. We conclude that more work is needed in order to properly understand the perceptual and cognitive mechanisms behind scale perception in VR. Copyright © 2022 by SCITEPRESS - Science and Technology Publications, Lda. All rights reserved.

关键词： Visualization

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Development of a Control System for a Vibratory Lapping-Polishing Machine 28

Development of a Control System for a Vibratory Lapping-Poli...

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28th IEEE International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, DIPED 2023

作者： Korendiy, Vitaliy Kachur, Oleksandr Zakharov, Viktor Department of Technical Mechanics and Engineering Graphics Lviv Polytechnic National University Lviv Ukraine Department of Computer-Aided Design Lviv Polytechnic National University Lviv Ukraine Department of Technical Mechanics and Engineering Graphics Lviv Polytechnic National UniversityGalca Ltd Lviv Ukraine

ISBN: (纸本)9798350315332

Vibratory equipment is widely used in various fields of mechanical, industrial, and manufacturing engineering. Particularly, such machines can be effectively implemented while carrying out finishing technological operations, e.g., glazing, polishing, and lapping of different machine parts. The present paper is focused on developing the control system for the novel design of a vibratory lapping-polishing machine driven by six solenoids. The main purpose consists in providing the circular trajectory of the working member and ensuring the machining uniformity at each point of the surface being treated. In such a case, it is proposed to actuate the solenoids with the specified time shift depending on the forced frequency needed to be provided. The duration of the signal actuating the solenoid is equal to one-sixth of the total duration of a cycle (period) of the working body oscillation. The corresponding control approach is developed and simulated in the Tinkercad application, while the control system is designed based on the Arduino hardware and software. In addition, the laboratory prototype of the vibratory lapping-polishing machine and the corresponding control system are implemented in practice. The performed laboratory studies and experimental tests substantiate the possibilities of generating the circular oscillations of the working member of the vibration-driven lapping-polishing machine. The obtained results may be useful for engineers and technologists dealing with control systems of various vibratory technological equipment based on electromagnetic and solenoid-type drives. © 2023 IEEE.

关键词： Polishing machines

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Alternating optimization for bundle adjustment with closed form solutions

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Science China(Information Sciences) 2025年第6期 286-300页

作者： Chengzhe MENG Yiwen JIANG Weiwei XU State Key Lab of Computer-Aided Design & Computer Graphics Zhejiang University

This study proposes a novel alternating optimization algorithm for bundle adjustment, a critical process in structure from motion methods. We introduce the inverse depth of each three-dimensional(3D) point as an augmented independent variable and develop a low-order polynomial error metric. Theoretically, the error can be adjusted to align closely with the re-projection error since it essentially acts as a re-weighted re-projection error. We decouple the bundle adjustment problem by breaking it down into three separate tasks: estimating the camera's pose, determining the 3D structure, and optionally estimating the camera's intrinsic parameter. Each task can be handled independently, either by camera or by point, allowing for easy distribution of computation. Camera pose estimation is a case of the absolute orientation problem, which can be globally solved in closed form. A linearization scheme is proposed for 3D point estimation, which allows the computation of the update direction and line search in closed form. Our algorithm proves to be efficient, reliable,and accurate, as demonstrated by experimental results that confirm its superiority over recent alternatives.

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Indentation behavior of a semi-infinite piezoelectric semiconductor under a rigid flat-ended cylindrical indenter

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Applied Mathematics and Mechanics(English Edition) 2024年第4期45卷 649-662页

作者： Shijing GAO Lele ZHANG Jinxi LIU Guoquan NIE Weiqiu CHEN State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China Hebei Key Laboratory for Mechanics of Intelligent Materials and Structures Department of Engineering MechanicsShijiazhuang Tiedao UniversityShijiazhuang 050043China State Key Laboratory of Computer Aided Design and Computer Graphics Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceDepartment of Engineering MechanicsZhejiang UniversityHangzhou 310027China

This paper theoretically studies the axisymmetric frictionless indentation of a transversely isotropic piezoelectric semiconductor(PSC)half-space subject to a rigid flatended cylindrical *** contact area and other surface of the PSC half-space are assumed to be electrically *** the Hankel integral transformation,the problem is reduced to the Fredholm integral equation of the second *** equation is solved numerically to obtain the indentation behaviors of the PSC half-space,mainly including the indentation force-depth relation and the electric potential-depth *** results show that the effect of the semiconductor property on the indentation responses is limited within a certain range of variation of the steady carrier *** dependence of indentation behavior on material properties is also analyzed by two different kinds of *** element simulations are conducted to verify the results calculated by the integral equation technique,and good agreement is demonstrated.

关键词： piezoelectric semiconductor(PSC) insulating indenter electromechanical response singular integral equation finite element simulation

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