• Title/Summary/Keyword: 3D modeling

Search Result 3,411, Processing Time 0.034 seconds

Definition of 3D Modeling Level of Detail in BIM Regeneration Through Reverse Engineering - Case Study on 3D Modeling Using Terrestrial LiDAR - (역설계를 통해 BIM 구축시에 3D 모델링에 대한 세밀도(LoD) 정립 - 지상 LiDAR 활용한 3D 모델링 연구 중심 -)

  • Chae, Jae-Hyun;Lee, Ji-Yeong
    • Journal of KIBIM
    • /
    • v.7 no.4
    • /
    • pp.8-20
    • /
    • 2017
  • When it comes to set up the BIM through the reverse engineering, the level of detail(LoD) required for finalized outcomes is different from each purpose. Therefore, it is necessary to establish some concrete criteria which describe the definition of LoDs on 3D modeling for the purpose of each reverse engineering. This research shows the criteria of the 1) positional accuracy, 2) generalization level, 3) scale level, 4) scope of description, and 5) the area available for application by classifying LoD from 1 to 6 on 3D modeling for each purpose of reverse engineering. Moreover, through applying those criteria for the 3D point cloud dataset of building made by terrestrial LiDAR, this research finds out the working hour of 3D modeling of reverse engineering by each LoDs according to defined LoD criteria for each level. It is expected that those findings, how those criteria of LoD on reverse engineering are utilized for modeling-workers to decide whether the outcomes can be suitable for their budget, applicable fields or not, would contribute to help them as a basic information.

3D Face Modeling based on 3D Morphable Shape Model (3D 변형가능 형상 모델 기반 3D 얼굴 모델링)

  • Jang, Yong-Suk;Kim, Boo-Gyoun;Cho, Seong-Won;Chung, Sun-Tae
    • The Journal of the Korea Contents Association
    • /
    • v.8 no.1
    • /
    • pp.212-227
    • /
    • 2008
  • Since 3D face can be rotated freely in 3D space and illumination effects can be modeled properly, 3D face modeling Is more precise and realistic in face pose, illumination, and expression than 2D face modeling. Thus, 3D modeling is necessitated much in face recognition, game, avatar, and etc. In this paper, we propose a 3D face modeling method based on 3D morphable shape modeling. The proposed 3D modeling method first constructs a 3D morphable shape model out of 3D face scan data obtained using a 3D scanner Next, the proposed method extracts and matches feature points of the face from 2D image sequence containing a face to be modeled, and then estimates 3D vertex coordinates of the feature points using a factorization based SfM technique. Then, the proposed method obtains a 3D shape model of the face to be modeled by fitting the 3D vertices to the constructed 3D morphable shape model. Also, the proposed method makes a cylindrical texture map using 2D face image sequence. Finally, the proposed method builds a 3D face model by rendering the 3D face shape model with the cylindrical texture map. Through building processes of 3D face model by the proposed method, it is shown that the proposed method is relatively easy, fast and precise than the previous 3D face model methods.

Utilization of SketchUp for Efficient 3D Modeling of Buildings

  • Park, Joon Kyu;Lee, Keun Wang
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
    • /
    • v.35 no.5
    • /
    • pp.431-438
    • /
    • 2017
  • The information management system for urban planning, urban management and related decision making is increasing an importance in recent years. Especially, the information about 3D buildings in urban area is necessary for urban management related precise location based service. However, it takes a lot of time, effort, and costs to produce 3D modeling data of buildings. These problems have been found in many studies, but the research to solve these problems is still necessary. In this study, we have tested an efficient 3D modeling method of building to solve these problems. SketchUp was used to test 3D modeling methods with OSM(OpenStreetMap) data. The other 3D modeling method using a digital map was tested. The 3D modeling of building data was efficient using PlaceMaker, which can use OSM data. In addition, modeling was possible through simple editing of the digital map and automatic building generation. The efficiency of the research results is presented by comparing with the traditional method based on the regulation and the stadard man power issued by Korean government. These two 3D modeling methods of building tested through the study can be used as basic data for related research and work. Additional studies should be conducted to improve the accuracy of the building model and determine how to obtain height data efficiently.

Recent Trends in 3D Human Modeling and Deformation Technology (3D 휴먼 모델링 및 변형 기술 동향)

  • Lim, S.J.;Lee, J.H.;Koo, B.K.;Lee, K.H.
    • Smart Media Journal
    • /
    • v.1 no.1
    • /
    • pp.64-71
    • /
    • 2012
  • Computer graphics applications such as virtual reality, games, animation begin from 3D modeling. The technology of 3D modeling and deformation has become an active research field in the past few decades from the combination of basic 3D primitives to the realistic modeling and deformation algorithm. In this paper, we introduce recent trends in 3D human modeling and deformation technology.

  • PDF

3DARModeler: a 3D Modeling System in Augmented Reality Environment (3DARModeler : 증강현실 환경 3D 모델링 시스템)

  • Do, Trien Van;Lee, Jeong-Gyu;Lee, Jong-Weon
    • Journal of Korea Game Society
    • /
    • v.9 no.5
    • /
    • pp.127-136
    • /
    • 2009
  • This paper describes a 3D modeling system in Augmented Reality environment, named 3DARModeler. It can be considered a simple version of 3D Studio Max with necessary functions for a modeling system such as creating objects, applying texture, adding animation, estimating real light sources and casting shadows. The 3DARModeler introduces convenient, and effective human-computer interaction to build 3D models. The 3DARModeler targets nontechnical users. As such, they do not need much knowledge of computer graphics and modeling techniques. All they have to do is select basic objects, customize their attributes, and put them together to build a 3D model in a simple and intuitive way as if they were doing in the real world.

  • PDF

A Study on the Application of 3D Digital Technology for Fashion Design (3D 디지털 기술을 활용한 패션 디자인 개발에 관한 연구)

  • Kim, Ji-Eon
    • Journal of the Korean Society of Costume
    • /
    • v.57 no.2 s.111
    • /
    • pp.45-58
    • /
    • 2007
  • This study shows that clothes are made just the same as the real thing in the virtual space through 3D digital technology. This study is significant to expand the area of fashion design in the virtual space. This study analyzes the practical use of the third dimension computer graphics in the aspect of fashion, and it is proposed the 3D fashion design simulation in the virtual space used on 3D studio max, poser, photoshop program according to fashion design process. The main design concept is "temporary bridge" from rainbow. "Temporary bridge" is a rainbow bridge which connects nature, man and technology, and also the past, present, and future. This study is supposed six fashion design in accordance with three sub-theme under main concept by changing rotor and texture used on 3D simulation. The conclusion are as follows : First fashion design process, which consists of design conceptualization, design definition, and computer design process, composed of body modeling, clothing modeling, texture mapping, rendering by lighting and camera establishing are compared. Second, fashion design process is applied to digital technology. Third, the method of body modeling is both that of direct modeling in 3D Studio Max and that of importing DXF file from poser. And the method of direct clothing modeling in 3D Studio Max are two methods, polygon modeling and nurbs modeling. Polygon modeling is more satisfied than nurbs modeling in the aspect of expression to clothing and round face. Forth, this study applies textures and colors transformed by photoshop on manufactured 3D Clothes. According to this result, fashion designers are able to confirm a customer or client in their design minds viewing 3D simulation by various textures. colors and angles. It is able to advance digital fashion show in the future.

3D Architecture Modeling and Quantity Estimation using SketchUp (스케치업을 활용한 3D 건축모델링 및 물량산출)

  • Kim, Min Gyu;Um, Dae Yong
    • Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
    • /
    • v.7 no.6
    • /
    • pp.701-708
    • /
    • 2017
  • The construction cost is estimated based on the drawings at the design stage and constructor will find efficient construction methods for budgeting and budgeting appropriate to the budget. Accurate quantity estimation and budgeting are critical to determining whether the project is profitable or not. However, since this process is mostly performed depending on manpower or 2D drawings, errors are likely to occur and The BIM(Build Information Modeling) program, which can be automated, is very expensive and difficult to apply in the field. In this study, 3D architectural modeling was performed using SketchUp which is a 3D modeling software and suggest a methodology for Quantity Estimation. As a result, 3D modeling was performed effectively using 2D drawings of buildings. Based on the modeling results, it was possible to calculate the difference of the quantity estimation by 2D drawing and 3D modeling. The research suggests that the 3D modeling using the SketchUp and the calculation of the quantity can prevent the error of the conventional 2D calculation method. If the applicability of the research method is verified through continuous research, it will contribute to increase the efficiency of architectural modeling and quantity Estimation work.

A Study on Tower Modeling for Artificial Intelligence Training in Artifact Restoration

  • Byong-Kwon Lee;Young-Chae Park
    • Journal of the Korea Society of Computer and Information
    • /
    • v.28 no.9
    • /
    • pp.27-34
    • /
    • 2023
  • This paper studied the 3D modeling process for the restoration of the 'Three-story Stone Pagoda of Bulguksa Temple in Gyeongju', a stone pagoda from the Unified Silla Period, using artificial intelligence (AI). Existing 3D modeling methods generate numerous verts and faces, which takes a considerable amount of time for AI learning. Accordingly, a method of performing more efficient 3D modeling by lowering the number of verts and faces is required. To this end, in this study, the structure of the stone pagoda was deeply analyzed and a modeling method optimized for AI learning was studied. In addition, it is meaningful to propose a new 3D modeling methodology for the restoration of stone pagodas in Korea and to secure a data set necessary for artificial intelligence learning.

A Systematic Construction Process of 3D Database for Realtime Virtual Simulation of Transportation Equipments (수송장비의 실시간 가상 시뮬레이션을 위한 3차원 데이터베이스의 체계적인 구축 프로세스)

  • Kim, Bo-Hyun
    • IE interfaces
    • /
    • v.16 no.2
    • /
    • pp.258-267
    • /
    • 2003
  • Recently, virtual reality technologies have been rapidly developed and realtime virtual simulation methods have been extensively employed for several application areas such as game, sports, manufacturing, military, and so on. A 3D database in realtime virtual simulation plays a key role because it makes users feel reality in virtual space. In a application view of 3D database, a systematic construction approach is required to reduce its construction time and increase its quality. However, many researches have been mostly focused on realtime graphic issues and its key technologies. In virtual simulation of transportation equipments, this paper proposes a systematic construction process of 3D database consisting of four stages as follows: 1) determine the activity space of a equipment, 2) collect data related to 3D database construction, 3) make a 3-dimensional modeling strategy, and 4) generate and evaluate a 3D model. This paper also introduces a new procedure of 3D environment modeling, which summarizes and expands our modeling experiences, to be used as a modeling guide.