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고형석(Hyeong-Seok Ko) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.2Ⅱ
인간 동작의 애니메이션에 대해서는 지난 30년 동안 애니메이션 연구가들의 많은 관심을 모아 왔다. 최근에는 그 동안의 축적된 연구성과를 바탕으로 영화에 등장하는 인물을 애니메이션으로 처리하기 위한 디지털액터의 연구가 진행되고 있다. 디지털액터는 일반적인 휴먼 애니메이션에 비해 요구되는 사실성 면에서 차원을 달리하고 있다. 본 논문에서는 그 동안 디지털액터의 모델링 및 애니메이션을 위한 여러 가지 방법들을 검토해보고, 본인이 속해있는 서울대학교 휴먼애니메이션연구단에서 수행해 가고 있는 연구테마와 중간 결과들을 소개한다. Animation of human motion has been the focus of great deal of research over the last 30 years. Recently, a different flavor has been added to the topic -- realizing digital actors to replace human actors. Digital actors require totally different level of realism than the general human figure animation. In this paper I review the methods proposed for modeling and animating digital actors, and introduce the research topics that is being carried out in SNU Human Animation Center.
Real-Time Simulation of Large Rotational Deformation and Manipulation
최민규,고형석,Choi, Min-Gyu,Ko, Hyeong-Seok Korea Computer Graphics Society 2004 컴퓨터그래픽스학회논문지 Vol.10 No.1
This paper proposes a real-time technique for simulating large rotational deformations. Modal analysis based on a linear strain tensor has been shown to be suitable for real-time simulation, but is accurate only for moderately small deformations. In the present work, we identify the rotational component of an infinitesimal deformation, and extend linear modal analysis to track that component. We then develop a procedure to integrate the small rotations occurring al the nodal points. An interesting feature of our formulation is that it can implement both position and orientation constraints in a straightforward manner. These constraints can be used to interactively manipulate the shape of a deformable solid by dragging/twisting a set of nodes, Experiments show that the proposed technique runs in real-time even for a complex model, and that it can simulate large bending and/or twisting deformations with acceptable realism.
A Physics-Based Modelling of Multipbase Fluid Phenomena
송오영,신현철,고형석,Song, Oh-Young,Shin, Hyun-Cheol,Ko, Hyeong-Seok Korea Computer Graphics Society 2004 컴퓨터그래픽스학회논문지 Vol.10 No.3
This paper presents a physically based technique for simulating complex multiphase fluids. This work is motivated by the "stable fluids" method developed by Stam to handle gaseous fluids. We extend this technique to water, which calls for the development of methods for modeling multiphase fluids and suppressing dissipation. We construct a multiphase fluid formulation by combining the Navier-Stokes equations with the level set method. By adopting constrained interpolation profile (CIP)-based advection, we reduce the numerical dissipation and diffusion significantly. We further reduce the dissipation by converting potentially dissipative cells into droplets or bubbles that undergo Lagrangian motion. Due to the multiphase formulation, the proposed method properly simulates the interaction of water with surrounding air, instead of simulating water in a void space. Moreover. the introduction of the non-dissipative technique means that, in contrast 10 previous methods, the simulated water does not unnecessarily lose mass and its motion is not damped to an unphysical extent. Experiments showed that the proposed method is stable and runs fast. It is demonstrated that two-dimensional simulation runs in real-time.
A Physics-Based Modelling of Multiphase Fluid Phenomena
송오영,신현철,고형석,Song, Oh-Young,Shin, Hyun-Cheol,Ko, Hyeong-Seok Korea Computer Graphics Society 2004 컴퓨터그래픽스학회논문지 Vol.10 No.4
This paper presents a physically based technique for simulating complex multiphase fluids. This work is motivated by the "stable fluids" method developed by Stam to handle gaseous fluids. We extend this technique to water, which calls for the development of methods for modeling multiphase fluids and suppressing dissipation. We construct a multiphase fluid formulation by combining the Navier-Stokes equations with the level set method. By adopting constrained interpolation profile (CIP)-based advection, we reduce the numerical dissipation and diffusion significantly. We further reduce the dissipation by converting potential1y dissipative cel1s into droplets or bubbles that undergo Lagrangian motion. Due to the multiphase formulation, the proposed method properly simulates the interaction of water with surrounding air, instead of simulating water in a void space. Moreover, the introduction of the non-dissipative technique means that, in contrast to previous methods, the simulated water does not unnecessarily lose mass and its motion is not damped to an unphysical extent. Experiments showed that the proposed method is stable and runs fast. It is demonstrated that two-dimensional simulation runs in real-time.