• Title, Summary, Keyword: LOD

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Cartoon Rendering with Level-of-Detail (세분화 단계(LOD)를 적용한 카툰렌더링)

  • Park, Jung-Hyun;Ryoo, Seung-Teak;Park, Jin-Wan
    • The Journal of the Korea Contents Association
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    • v.7 no.9
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    • pp.26-33
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    • 2007
  • NPR is the area of research which does the image creation of the impression where the hazard person who creates made a human intimate image by the hand in objective. NPR in Cartoon-Rendering when the human being recognizes a thing, it is a technique which expresses a thing to use an appearance and the line which are a means of basic and intuitional expression. Also Cartoon the person probably is, the hazard which helps, raises the efficiency of namely meaning delivery and a simplification technique with the means for it uses. Is like this cartoon basic rules where the simplification and omission are life, from modeling, the low of LOD technique which it is using specially actively from game and one pulse communication is having a common point. The research which it sees Cartoon effects of GPU bases which use DirectX Shader programs LOD it leads and it applies the method for about under presenting it expresses Cartoon effects in exterior.

A Study on Feature-Based Multi-Resolution Modelling - Part II: System Implementation and Criteria for Level of Detail (특징형상기반 다중해상도 모델링에 관한 연구 - Part II: 시스템 구현 및 상세수준 판단기준)

  • Lee K.Y.;Lee S.H.
    • Korean Journal of Computational Design and Engineering
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    • v.10 no.6
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    • pp.444-454
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    • 2005
  • Recently, the requirements of multi-resolution models of a solid model, which represent an object at multiple levels of feature detail, are increasing for engineering tasks such as analysis, network-based collaborative design, and virtual prototyping and manufacturing. The research on this area has focused on several topics: topological frameworks for representing multi-resolution solid models, criteria for the level of detail (LOD), and generation of valid models after rearrangement of features. As a solution to the feature rearrangement problem, the new concept of the effective zone of a feature is introduced in the former part of the paper. In this paper, we propose a feature-based non-manifold modeling system to provide multi-resolution models of a feature-based solid or non-manifold model on the basis of the effective feature zones. To facilitate the implementation, we introduce the class of the multi-resolution feature whose attributes contain all necessary information to build a multi-resolution solid model and extract LOD models from it. In addition, two methods are introduced to accelerate the extraction of LOD models from the multi-resolution modeling database: the one is using an NMT model, known as a merged set, to represent multi-resolution models, and the other is storing differences between adjacent LOD models to accelerate the transition to the other LOD. We also suggest the volume of the feature, regardless of feature type, as a criterion for the LOD. This criterion can be used in a wide range of applications, since there is no distinction between additive and subtractive features unlike the previous method.

An Implementation of terrain manufacturing system using LOR alogorithm. (LOD를 적용한 지형 자동 생성 시스템 구현)

  • 신정은;조창석
    • Proceedings of the Korea Multimedia Society Conference
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    • pp.511-515
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    • 2002
  • 본 연구에서는 전투 시뮬레이션 게임 구현을 목적으로 하여 LOD를 적용한 실시간 지형 렌더링 시스템을 제작하였다. 이를 위하여 지형의 렌더링을 위한 폴리곤 수를 절감시키는 방식으로 메모리를 관리 할 수 있도록 하였고, 현재 위치와 시점의 거리에 따라 가까운 거리는 상세하게 표현하고 먼 거리는 지형의 외형을 최대한 유지하면서 폴리곤 수를 줄여 렌더링 하도록 하였다.

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A Study on Terrain Surface Modeling and Polygon-Searching Algorithms (지표면 모델링 및 폴리건 검색기법에 관한 연구)

  • 공지영;강현주;윤석준
    • Proceedings of the Korea Society for Simulation Conference
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    • pp.163-170
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    • 2002
  • Terrain surfaces have to be modeled in very detail and wheel-surface contacting geometry must be well defined in order to obtain proper ground-reaction and friction forces for realistic simulation of off-road vehicles. Delaunay triangulation is one of the most widely used methods in modeling 3-dimensional terrain surfaces, and T-search is a relevant algorithm for searching resulting triangular polygons. The T-search method searches polygons in successive order and may not allow real-time computation of off-road vehicle dynamics if the terrain is modeled with many polygons, depending on the computer performance used in the simulation. In order to accelerate the searching speed of T-search, a terrain database of triangular polygons is modeled in multi-levels by adopting the LOD (Level of Detail) method used in realtime computer graphics. Simulation results show that the new LOD search is effective in shortening the required computing time. The LOD search can be even further accelerated by introducing an NN (Neural Network) algorithm, in the cases where a appropriate range of moving paths can be predicted by cultual information of the simulated terrain, such as lakes, houses, etc.. Numerical tests show that LOD-NN search almost double the speed of the original T-search.

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A Hybrid Rendering Model to support LOD(Level of Detail) (LOD(Level of Detail)를 지원하는 하이브리드 렌더링 모델)

  • Kim, Hak-Ran;Park, Hwa-Jin
    • Journal of Digital Contents Society
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    • v.9 no.3
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    • pp.509-516
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    • 2008
  • We propose the Hybrid Rendering model to support multi-resolution for computer graphics. LOD method for computer graphics system considering performance of device environment and end-user preference usually adopts mesh resolution, mipmap in texture rendering, or oct-tree data structure in ray tracing. The hybrid rendering model, as a local shading model combining Gouraud shading model and a flat shading model, applies a proper shading method to each of polygons consisting of an object. This method can be an effective alternative to reduce real-time rendering time so that it can be utilized in real time adaptive service of computer graphic contents among various device environments under ubiquitous environments.

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LOD(Level-of-Detail) using Dynamic-Hierarchies of collision detection efficiency improvement in 3D object (LOD(Level-of-detail)이용한 3D객체의 동적 계층의 충돌 검사 성능 향상)

  • Lee, Chun-Ho;Kim, Tae-Yong
    • 한국HCI학회:학술대회논문집
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    • pp.963-968
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    • 2007
  • In this paper introduce Standard 3D object(Bounding-Volume). In 3D game very efficient control algorithm Using collision detection which controls the convenient of a game based on Standard 3D object specially collision-detection. This algorithm is designed LOD(Level-of-Detail) using Dynamic-Hierarchies of collision detection efficiency improvement in 3D object.

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3D modeling of Korean Traditional House based on BIM for Uploading to Spatial Information Open Platform (공간정보 오픈플랫폼 탑재를 위한 한옥의 BIM 기반 3차원 모델링 연구)

  • Kim, Kyeong-Min;Kim, Chan-Yong;Choi, Yun-Woong;Cho, Gi-Sung
    • Journal of Cadastre & Land InformatiX
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    • v.44 no.2
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    • pp.91-101
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    • 2014
  • This study tried to create 3D object with LOD3 level for Korean traditional house which is atypical structure, upload to spatial information open platform and confirm the possibility for creating 3D-map. And this study tried to create 3D model for Korean traditional house based on BIM, performed 3D modeling for interior spatial information of Korean traditional house and confirm the development possibility of 3D modeling and visualization method of Korean traditional house. Also this study present the possibility of LOD4 level visualization for spatial information of Korean traditional house which is atypical structure, but 3D object with LOD4 level can't be uploaded to Spatial Information Open Platform currently, cause by data volume limitation of spatial information open platform.

Real-Time Terrain Rendering using Quadtree Wavelet Transform (쿼드트리와 웨이블릿 변환을 이용한 실시간 지형 렌더링)

  • 한정현;박헌기;정문주
    • Journal of the Korea Society for Simulation
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    • v.10 no.3
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    • pp.95-103
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    • 2001
  • Rendering of 3D terrain data in real-time is difficult because of its large scale. So, it is necessary to use level-of-detail(LOD) that uses fewer data, but makes almost similar image to the original. We present an algorithm for real-time LOD generation and rendering of 3D terrain data. The algorithm applies wavelet transform to the terrain data, and then generates quadtree based view-dependent LOD using wavelet coefficients that are the output of wavelet transform. It also uses frame-to-frame coherence and view culling for high frame rates.

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LOD Platform Design of the Collaborative e-Learning System (협력학습을 지원하는 e-Learning 시스템의 주문형 강의 플랫폼 설계)

  • 진미향;최기원;박만곤
    • Proceedings of the Korea Multimedia Society Conference
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    • pp.860-863
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    • 2003
  • 인터넷과 정보 통신 기술의 발달은 컴퓨터 응용 및 컴퓨팅 환경에 상당한 변화를 가져왔으며, 여러 분야에서 이들 기술이 응용되고 있다. 고도로 발전하고 있는 정보통신 기술이 교육분야에 적용 및 활용되어 기존의 교육 패러다임에 상당한 변화를 초래함으로써, 새로운 교육형태의 교육체계 구현을 통해 교육 현장에 커다란 기여를 하고 있다. 대표적인 것이 원격교육을 비롯한 e-learning, 가상교육시스템 등이 있다. 인터넷과 컴퓨터가 보편화된 현재, 많이 연구 제안되고 구현이 되어서, 실제로 온라인 상에서 실시간 혹은 비실시간으로 학습교육시스템들이 서비스되고 있다. 본 논문에서는 기존에 많이 제안된 e-Learning시스템에 협력학습의 개념을 도입하여 교수-학습자 뿐 아니라 학습자-학습자간에 상호작용을 극대화하고, 한발 더 나아가 웹을 통하여 교수의 강의 내용을 학습자가 언제, 어디서든지 멀티미디어 데이터를 제공받아서 학습 및 평가 받을 수 있는 LOD(Lecture on Demand :주문형 강의)을 도입하여 협력학습을 지원하는 e-Learning 시스템의 LOD 플랫폼의 설계를 제안한다.

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Characteristics of Performance by Different Level-Of-Details (LOD) for Building Energy Model (BEM) (건물에너지모델(BEM)의 정밀도와 에너지 해석 특성 평가)

  • Lee, Myung-Hee;Chae, Young-Tae
    • 한국건축친환경설비학회 논문집
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    • v.11 no.5
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    • pp.364-375
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    • 2017
  • This study presents a comparison analysis on characteristics of energy performance by different LOD (Level-Of-Details) for BEM (Building Energy Model). Although building energy simulation has been interested in planning energy conservation measures (ECMs) for both new and exist buildings, there are lack of specific studies on the detail levels for energy modeling to get reliable energy performance data on buildings. Energy simulation for a residential building with five different level of details for a residential building have been conducted to understand how the simplicity of BEM impacts on the energy performance of design day and annual energy consumption. As a result, it is necessary to separate the conditioned space from the non conditioned space as the simplification of the geometric in order to reduce the labor of building energy simulation. Also Simplification of material characteristic is suitable for understanding the load characteristic by setting in detail according to the baseline model.