• Title/Summary/Keyword: Lattice shape matching

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An Effective Physics Based Deformation Technique Using Augmented Reality Environments (증강현실 환경을 이용한 효율적인 물리기반 형상변형 기술)

  • Choi, Han-Kyun;Kim, Hyun-Soo;Park, Min-Ki;Lee, Kwan H.
    • 한국HCI학회:학술대회논문집
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    • 2009.02a
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    • pp.90-93
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    • 2009
  • The use of physics based deformation methods is continuously increasing in computer graphics area such as game and simulation. Many researchers have worked on this method. However, relatively few researchers have considered the development of the user interaction to the 3D objects. This research proposes a physics-based deformation technique using AR (Augmented Reality) environments to enhance user immersion and the effectiveness of the deformation. In the AR circumstances, the physics based deformation should be accomplished in realtime. In the proposed method, we combine RBF (Radial Basis Function) [1] and LSM (Lattice Shape Matching) [2, 3] and apply it to polygonal models for real-time user interaction. The dynamics of the LSM is also calculated to trace the movement of each lattice. Finally these algorithms are implemented in AR environments.

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Fabrication of High-Density Nickel Hydroxide Powder-I (고밀도 수산화니켈 분말의 제조에 관한 연구-I)

  • 신동엽;조원일;신치범;조병원;강탁;윤경석
    • Journal of the Korean institute of surface engineering
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    • v.28 no.2
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    • pp.92-100
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    • 1995
  • To increase the capacity of positive electrode materials for matching the high capacity negative electrode materials in alkaline rechargeable batteries, high-density nickel hydroxide powders were made through a continuous process from nickel sulfate reacted with ammonia and sodium hydroxidc. The effect of operating conditions on structure, shape, size distribution, apparent density and tap density of powders were investigated. Crystal structure of nickel hydroxide powder was hcp according to Bravais Lattice. The increase of mean residence time promoted the growth of (101) plane. The shape of powder was nearly spherical. Their size was in the range of $2~50\mu\textrm{m}$. The size distribution of the powders prepared was narrower than that of commercially obtained nickel hydroxide. Apparent density and tap density were 1.6~1.7g/cc and 2.0~2.1g/cc, respectively.

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Interaction Technique of Physics Based Deformation for User Immersion (물리기반 형상변형의 몰입감 증대를 위한 상호작용기술)

  • Choi, Han Kyun;Kim, Hyun Soo;Lee, Seung Joo;Park, Min Ki;Lee, Kwan H.
    • Proceedings of the Korea Information Processing Society Conference
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    • 2009.04a
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    • pp.216-219
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    • 2009
  • 3 차원 콘텐트를 이용한 물리기반 시뮬레이션은 최근 컴퓨터 그래픽스 분야에서 가장 활발히 연구되는 연구 중 하나이다. 이와 더불어 이러한 기술들과 사용자간의 몰입감을 증가시키는 상호작용 기술 역시 계속하여 증가하는 추세이다. 본 연구는 이러한 추세에 발맞추어 물리기반 형상변형 기술의 몰입감을 증가시키기 위한 상호작용 방법을 제안한다. 제안된 방법에서는 3 차원 객체와 사용자와의 효율적인 상호작용을 위해서 시스템을 증강현실 환경에서 구현하였다. 증강현실을 이용한 시스템의 제약조건은 실시간 계산이다. 때문에, 제안된 시스템은 RBF(Radial Basis Function) [1] 와 LSM (Lattice Shape Matching) [2, 3] 방법을 조합하여 물리기반 상호작용 기술을 완성 하였고 실험을 통해 실시간 계산을 확인하였다. 또한, 3 차원 객체가 충돌하여 변형이 일어날 때 감각형 객체 (Tangible object)에 진동을 주어 물리기반 형상변형의 사용자 상호작용에 관한 몰입감을 증가시켰다.