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Development of texture mapping Approaches for Additively Manufacturable Surfaces

Chinese Journal of Mechanical Engineering 2022年第4期35卷 125-138页

作者： Bhupesh Verma Omid Zarei Song Zhang Johannes Henrich Schleifenbaum Chair for Digital Additive Production RWTH Aachen University52074 AachenGermany

manufacturing(AM)technologies have been recognized for their capability to build complex components and hence have ofered more freedom to designers for a long time.The ability to directly use a computer-aided design(CAD)model has allowed for fabricating and realizing complicated components,monolithic design,reducing the number of components in an assembly,decreasing time to market,and adding performance or comfort-enhancing functionalities.One of the features that can be introduced for boosting a component functionality using AM is the inclusion of surface texture on a given component.This inclusion is usually a difcult task as creating a CAD model resolving fne details of a given texture is difcult even using commercial software packages.This paper develops a methodology to include texture directly on the CAD model of a target surface using a patch-based sampling texture synthesis algorithm,which can be manufactured using AM.Input for the texture generation algorithm can be either a physical sample or an image with heightmap information.The heightmap information from a physical sample can be obtained by 3D scanning the sample and using the information from the acquired point cloud.After obtaining the required inputs,the patches are sampled for texture generation according to non-parametric estimation of the local conditional Markov random feld(MRF)density function,which helps avoid mismatched features across the patch boundaries.While generating the texture,a design constraint to ensure AM producibility is considered,which is essential when manufacturing a component using,e.g.,Fused Deposition Melting(FDM)or Laser Powder Bed Fusion(LPBF).The generated texture is then mapped onto the surface using the developed distance and angle preserving mapping algorithms.The implemented algorithms can be used to map the generated texture onto a mathematically defned surface.This paper maps the textures onto fat,curved,and sinusoidal surfaces for illustration.After the texture mapping,a stereolithography(STL)model is generate

关键词： texture synthesis Design for additive manufacturing Image processing textured surface generation texture mapping

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Bernoulli Embedding Model and Its Application in texture mapping

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Journal of Computer Science & Technology 2006年第2期21卷 199-203页

作者：张宏鑫汤颖赵晖鲍虎军 State Key Lab of CAD&CG Zhejiang University Hangzhou 310027 P.R. China Automation Department Xi'an Jiaotong University Xi'an 710049 P.R. China

A novel texture mapping technique is proposed based on nonlinear dimension reduction, called Bernoulli logistic embedding （BLE）. Our probabilistic embedding model builds texture mapping with minimal shearing effects. A log-likelihood function, related to the Bregman distance, is used to measure the similarity between two related matrices defined over the spaces before and after embedding. Low-dimensional embeddings can then be obtained through minimizing this function by a fast block relaxation algorithm. To achieve better quality of texture mapping, the embedded results are adopted as initial values for mapping enhancement by stretch-minimizing. Our method can be applied to both complex mesh surfaces and dense point clouds.

关键词： dimension reduction Bernoulli logistic embedding texture mapping parameterization

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Research on Urban Building Parametric Modelling Method Based on CityEngine

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Journal of World Architecture 2024年第1期8卷 7-11页

作者： Xinyu Liu School of Geomatics and Urban Spatial Information Beijing University of Civil Engineering and ArchitectureBeijing 100044China

With the advancement of technology and the development of cities,urban planning and management methods are also constantly improving.From paper-based assignments to modern digitization,new technologies have enabled more efficient design and management for cities.3D modeling can used to simulate the urban environment,which can assist in urban planning and management.However,large-scale modeling cannot be achieved through existing modeling methods,and there are still some shortcomings in the maintenance of the model.Therefore,this article proposes a Computer Generated Architecture(CGA)parametric 3D modeling method based on CityEngine.Research on expanding and customizing modeling rules to create indoor and outdoor modeling rule templates for buildings and methods for generating urban 3D models have been carried out.The results have shown that the completed model can be displayed on different platforms thanks to parameterized modeling.The model can be modified easily and directly applied to the analysis and decision-making of urban planning schemes.

关键词： CGA rules Urban planning texture mapping Parametric modeling

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Bidirectional texture mapping

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Journal of Systems Engineering and Electronics 1992年第3期3卷 69-73页

作者： Wang XiaoweiBeijing Institute of Data Processing Technology, P.O.Box 3927, Beijing 100854, China Beijng Imtitute of Data Processing Ttechnology P.O. Box 3927 Beijing 100854 China

texture mapping is an important technique for high -quality image generation in computer graphics. In this paper, the shortcoming of the traditional texture mapping approaches is analysed and a general bidirectional texture mapping method is proposed. Based on the bidirectional mapping, an algorithm for mapping an image to an arbitrary polygon in 3D space is given.

关键词： Computer graphics texture mapping

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Method　of　Direct　texture　Synthesis　on　Arbitrary　Surfaces

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Journal of Computer Science & Technology 2004年第5期19卷 643-649页

作者： Fu-LiWu Chun-HuiMei Jiao-YingShi StateKeyLabofCAD＆CG ZhejiangUniversityHangzhou310027P.R.China

A direct texture synthesis method on arbitrary surfaces is proposed in thispaper. The idea is to recursively map triangles on surface to texture space until the surface iscompletely mapped. First, the surface is simplified and a tangential vector field is created overthe simplified mesh. Then, mapping process searches for the most optimal texture coordinates intexture sample for each triangle, and the textures of neighboring triangles are blended on the mesh.All synthesized texture triangles are compressed to an atlas. Finally, the simplified mesh issubdivided to approach the initial surface. The algorithm has several advantages over formermethods: it synthesizes texture on surface without local parameterization; it does not needpartitioning surface to patches; and it does not need a particular texture sample. The resultsdemonstrate that the new algorithm is applicable to a wide variety of texture samples and anytriangulated surfaces.

关键词： texture synthesis texture mapping mesh simplification computer graphics

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Transition texture Synthesis

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Journal of Computer Science & Technology 2008年第2期23卷 280-289页

作者：赖岳益戴文凯 Department of Computer Science and Information Engineering "National Dong Hwa University"Hualien 97401 TaiwanChina

Synthesis of transition textures is essential for displaying visually acceptable appearances on a terrain. This investigation presents a modified method for synthesizing the transition texture to be tiled on a terrain. All transition pattern types are recognized for a number of input textures. The proposed modified patch-based sampling texture synthesis approach, using the extra feature map of the input source and target textures for patch matching, can synthesize any transition texture on a succession pattern by initializing the output texture using a portion of the source texture enclosed in a transition cut. The transition boundary is further enhanced to improve the visual effect by tracing out the integral texture elements. Either the Game of Life model or Wang tiles method are exploited to present a good-looking profile of successions on a terrain for tiling transition textures. Experimental results indicate that the proposed method requires few input textures, yet synthesizes numerous tileable transition textures, which are useful for obtaining a vivid appearance of a terrain.

关键词： texture synthesis texture transition texture mapping

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Research on the texture-mapping of the Three-dimensional Urban Roadway Simulation of Virtual Battlefield

Research on the Texture-mapping of the Three-dimensional Urb...

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2012年计算机应用与系统建模国际会议

作者： Hou Runfeng Chu Shili Li Chenhui Shi Lei Qi Genhua Air Defense Forces Command Academy

Building virtual battlefield is an important subject in military simulation. In order to get realistic appearance in building roadway of battlefield by using 3D simulation technology, it’s natural to do some complex calculations for the surface of the roadway, involving patterns with certain colours and textures. Usually, the surface of roadway with single colour can be simulated by direct colouration. The surface involving complicated patterns with colours and textures need to use texture-mapping. In this paper, it’s demonstrated that, not only the complexity of the calculation for the surface can be simplified, but also the improvement of the efficiency and quality for the 3D simulation of the roadway can be achieved, by choosing proper texture pattern and appropriate texture mapping. Thereby, a satisfactory roadway constructed with 3D simulation technology appears.

关键词： Virtual battlefield 3D simulation Roadway texture mapping

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A Study on the Algorithms for 2D texture mapping and Its Employment in Hardware Design

A Study on the Algorithms for 2D Texture Mapping and Its Emp...

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2012年计算机应用与系统建模国际会议

作者： Wang Donghui Dong Liang Du Huimin Department of electronic engineering XUPT

Based on a solid analysis of the working principle of graphic processors, this paper puts forward the dual-rail handshake protocol of the data pipeline which is to be proved to improve the architecture of graphics rendering pipeline and thus make the system much closer to that of a graphic processor in real time. Specific algorithms and hardware design methods are as well developed in this work with their focus dwelling on the computation-consuming texture mappings, including two critical techniques: texture coordinate calculation and texture filtering. FPGA result shows that circuits based on textual algorithms can define accurately the textual coordinates and yield precise textual images, bringing significant improvements to the performance of graphics rendering.

关键词： GPU organization pipeline texture mapping

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Image—Based Synthesis of Chinese Landscape Painting

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Journal of Computer Science & Technology 2003年第1期18卷 22-28页

作者：于金辉罗国明彭群生 State Key Laboratory of CAD and CG Zhejiang University Hangzhou 310027 P.R. China

This paper describes a new framework for synthesizing Chinese landscape painting using an image-based approach. The framework involves two stages: a preprocessing phase, in which a few brush stroke texture primitivities (BSTP) are collected from samples of hand-made Chinese paintings, and the control picture is constructed to provide color IDs of mountains, and the on-line phases, in which the fog image is synthesized and mountains are "drawn" by mapping multiple layers of BSTP guided by the control picture. When more complex shading is needed, the shading picture is constructed and used during the BSTP mapping phase. Finally, the synthesized Chinese landscape paintings of a variety of styles are given and they look more close to the handmade work than those produced with previous modeling methods.

关键词： nonphotorealistic rendering image-based rendering texture mapping Chinese painting

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New Algorithm for 3D Facial Model Reconstruction and Its Application in Virtual Reality

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Journal of Computer Science & Technology 2004年第4期19卷 501-509页

作者： Rong-HuaLiang Zhi-GengPan ChunChen CollegeofComputerScience ZhejiangUniversityHangzhou310027P.R.China StateKeyLaboratoryofCADandCG ZhejiangUniversityHangzhou310027P.R.China

3D human face model reconstruction is essential to the generation of facial animations that is widely used in the field of virtual reality (VR). The main issues of 3D facial model reconstruction based on images by vision technologies are in twofold: one is to select and match the corresponding features of face from two images with minimal interaction and the other is to generate the realistic-looking human face model. In this paper, a new algorithm for realistic-looking face reconstruction is presented based on stereo vision. Firstly, a pattern is printed and attached to a planar surface for camera calibration, and corners generation and corners matching between two images are performed by integrating modified image pyramid Lucas-Kanade (PLK) algorithm and local adjustment algorithm, and then 3D coordinates of corners are obtained by 3D reconstruction. Individual face model is generated by the deformation of general 3D model and interpolation of the features. Finally, realistic-looking human face model is obtained after texture mapping and eyes modeling. In addition, some application examples in the field of VR are given. Experimental result shows that the proposed algorithm is robust and the 3D model is photo-realistic.

关键词： stereo vision image PLK algorithm 3D reconstruction texture mapping virtual reality

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