• Title, Summary, Keyword: Real-time rendering

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Post-Rendering 3D Warping using Projective Texture (투영 텍스춰를 이용한 렌더링 후 3차원 와핑)

  • Park, Hui-Won;Ihm, In-Seong
    • Journal of KIISE:Computer Systems and Theory
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    • v.29 no.8
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    • pp.431-439
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    • 2002
  • Due to the recent development of graphics hardware, real-time rendering of complex scenes is still a challenging task. As results of researches on image based rendering, the rendering schemes based on post-rendering 3D warping have been proposed. In general, these methods produce good rendering results. However, they are not appropriate for real-time rendering since it is not easy to accelerate the time-consuming algorithms within graphics subsystem. As an attempt to resolve this problem of the post-rendering 3D warping technique, we present a new real-time scheme based on projective texture. In our method, two reference images obtained by rendering complicated objects at two consecutive points of time are used. Rendering images of high quality for intermediate points of time are obtained by projecting the reference images onto a simplified object, and then blending the resulting images. Our technique will be effectively used in developing real-time graphics applications such as 3D games and virtual reality software and so on.

Shadow Techniques in Real-time Hatching Rendering (실시간 해칭 렌더링에서 그림자 기법)

  • Kim, Chan-Soo;Kim, Dae-Myung
    • Proceedings of the Korea Contents Association Conference
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    • pp.806-810
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    • 2006
  • The research of computer graphics is divided into two parts of photorealistic rendering and non-photorealistic rendering. The purpose of non-photo realistic rendering is to make image like cartoon, water-color, hatching etc. In this paper, we study for real-time hatching rendering and shadow techniques and we combine two techniques to make real-time hatching shadow. In shadow techniques we apply projected texture shadow to hatching rendering. Eventually, we introduce natural real-time hatching shadow through comparison and analysis.

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A Real-Time Rendering Algorithm of Large-Scale Point Clouds or Polygon Meshes Using GLSL (대규모 점군 및 폴리곤 모델의 GLSL 기반 실시간 렌더링 알고리즘)

  • Park, Sangkun
    • Korean Journal of Computational Design and Engineering
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    • v.19 no.3
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    • pp.294-304
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    • 2014
  • This paper presents a real-time rendering algorithm of large-scale geometric data using GLSL (OpenGL shading language). It details the VAO (vertex array object) and VBO(vertex buffer object) to be used for up-loading the large-scale point clouds and polygon meshes to a graphic video memory, and describes the shader program composed by a vertex shader and a fragment shader, which manipulates those large-scale data to be rendered by GPU. In addition, we explain the global rendering procedure that creates and runs the shader program with the VAO and VBO. Finally, a rendering performance will be measured with application examples, from which it will be demonstrated that the proposed algorithm enables a real-time rendering of large amount of geometric data, almost impossible to carry out by previous techniques.

Rendering States Changing Costs Reducing Technique for Real-time 3D Graphics (실시간 3D 그래픽을 위한 렌더링 상태 변경 비용 감소 기법)

  • Kim, Seok-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.8
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    • pp.1843-1849
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    • 2009
  • In real-time 3D Graphics, pipeline optimization is one of techniques enhancing rendering performance. Pipeline optimization is kind of buffer reordering problem, but it is NP-hard. Therefore techniques that is approximating optimal solution and suitable for real-time 3D graphics are needed. This paper analyze pattern of rendering states changing costs for real-time 3D graphics, and based on this, the algorithm that brings rendering states into line by changing costs is proposed. The proposed technique shows good performance enhancement when costs of some rendering states are much higher than others. Proposed technique shows 2.5 to 4 times better performance than non-ordering algorithm and becomes more faster when rendering costs of a state gets higher.

A study on the realtime toon rendering with shadow (그림자를 포함한 실시간 툰 렌더링에 관한 연구)

  • Ko, HyeKyung;Kang, Daeuk;Yoon, Kyunghyun
    • Journal of The Korea Computer Graphics Society
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    • v.6 no.4
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    • pp.9-14
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    • 2000
  • Non-Photorealistic rendering techniques, such as toon rendering, can enhance the quality of hand-drawn cell-animation images greatly with less effort. For this reason, to on rendering is one of the popular techniques used in the cell-animation image production field. The existing toon rendering techniques, however, have not been effective enough for the real-time image processing that the techniques have not been adequate for some processes that needs immediate responses such as virtual-realities, or video games. This paper will suggest the real-time toon rendering to overcome the limits through real-time outline detection and phong shading. In addition, a effective result-image is created as adding a shadow and a execution time remains by real-time through fast shadow generation algorithm.

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DMGL: An OpenGL ES Based Mobile 3D Rendering Libraries (DMGL: OpenGL ES 기반 모바일 3D 렌더링 라이브러리)

  • Hwang, Gyu-Hyun;Park, Sang-Hun
    • Journal of Korea Multimedia Society
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    • v.11 no.8
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    • pp.1160-1168
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    • 2008
  • Recent technological innovations of mobile hardware which make it possible to implement real-time 3D rendering effects under mobile environment have provided a potential to develop realistic mobile application programs. This paper presents platform independent, OpenGL ES based, real-time mobile rendering libraries, called DMGL for supporting high quality 3D rendering on handhold devices. The libraries allows the programmers who develops mobile graphics softwares to generate varying advanced real-time 3D graphics effects without great effort. Moreover, GPGPU-based libraries give a set of functions to solve complex equations for simulating natural phenomena such as smoke and fire, and to render the results in real-time.

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Real-time Modeling and Rendering of Tidal in Qiantang Estuary

  • Wang, Chang-Bo
    • International Journal of CAD/CAM
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    • v.9 no.1
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    • pp.79-83
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    • 2010
  • Tidal bore is a peculiar nature phenomenon which is caused by the lunar and solar gravitation. Based on the physical characters of tidal bores, in this paper we propose a novel method to model and render this phenomenon, especially the tidal waves in Qiantang estuary. According to Boltzmann equation for tidal waves, we solve it with the novel triangle mesh of Kinectic Flux Vector Splitting (KFVS) mode. Then a method combining a curve forecasting wave and particles model is proposed to render the dynamic scenes of overturning tidal waves. Finally, with some rendering technologies, various realistic tidal waves under diversified conditions is rendered in real time.

Real-Time Haptic Rendering of Slowly Deformable Bodies Based on Two Dimensional Visual Information for Telemanipulation (원격조작을 위한 2차원 영상정보에 기반한 저속 변형체의 실시간 햅틱 렌더링)

  • Kim, Jung-Sik;Kim, Young-Jin;Kim, Jung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.31 no.8
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    • pp.855-861
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    • 2007
  • Haptic rendering is a process providing force feedback during interactions between a user and a virtual object. This paper presents a real-time haptic rendering technique for deformable objects based on visual information of intervention between a tool and a real object in a remote place. A user can feel the artificial reaction force through a haptic device in real-time when a slave system exerts manipulation tasks on a deformable object. The models of the deformable object and the manipulator are created from the captured image obtained with a CCD camera and the recognition of objects is achieved using image processing techniques. The force at a rate of 1 kHz for stable haptic interaction is deduced using extrapolation of forces at a low update rate. The rendering algorithm developed was tested and validated on a test platform consisting of a one-dimensional indentation device and an off-the shelf force feedback device. This software system can be used in a cellular manipulation system providing artificial force feedback to enhance a success rate of operations.

The Real-Time Virtual Environment Control Using Haptic Interface System (촉각시스템을 이용한 실시간 가상환경제어)

  • Kang, Won-Chan;Kim, Young-Dong
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.52 no.3
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    • pp.121-126
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    • 2003
  • In this paper, we propose the haptic system for the real-time virtual environment-control, which controls the sense of sight, hearing and touch. In order to maintain the stable haptic system in this study, we apply the proxy force rendering algorithm and the real-time graphic deformation algorithm based on the FEM. The applied proxy algorithm makes the system possible to be more stable and prompt with a virtual object. Moreover, the haptic rendering algorithm is applied to work out a problem that the tactual transaction-period is different from the graphic transaction- period. The graphic deformation algorithm is developed in the real-time using the deformed FEM. To apply the FEM, a deformed material-model is produced and then the graphic deformation with this model is able to force. Consequently, the graphic rendering algorithm is deduced by the real-time calculation and simplification because the purpose of this system is to transact in the real time. Applying this system to the PC, we prove that it is possible to deform the graphics and transact the haptic. Finally we suggest the variable simulation program to show the efficiency of this system.

Real-Time Terrain Rendering Framework for GIS Applications

  • Kang, Dong-Soo;Lee, Eun-Seok;Shin, Byeong-Seok
    • Journal of Korea Spatial Information System Society
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    • v.11 no.2
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    • pp.73-78
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    • 2009
  • Real-time 3D visualization of terrain data is one of the important issues in GIS(Geographic Information System) field. We present a real-time terrain rendering engine that can use several types of GIS data source such as DEM(Digital Elevation Map), DTED(Digital Terrain Elevation Data) and LIDAR(Light Detection And Ranging). Our rendering engine is a quadtree-based terrain rendering framework with several acceleration modules. This can generate an ocular and binocular image. Also it can be applied to the flight simulation, walk-through simulation and a variety of GIS applications.

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