GAMES Webinar 2017-05期(Siggraph 2017论文报告) | 徐鸿燚(南加州大学),费昀(哥伦比亚大学)

 

【GAMES Webinar 2017-05期(Siggraph 2017论文报告)】

报告嘉宾1:徐鸿燚 , 美国南加州大学

报告时间:2017720日(星期四)晚20:00-20:45(北京时间)

主持人:许威威,浙江大学(个人主页:http://www.cad.zju.edu.cn/home/weiweixu/

报告题目: Interactive Design and Simulation of Elastic Material and Damping

报告摘要:

Finite Element Method (FEM) has been widely used for simulations of three-dimensional deformable objects. We investigate the problems of improving the fidelity, controllability and performance of FEM simulations for computer animation, games and virtual reality applications.

In this talk, I will first talk about how to enrich character animations with secondary soft-tissue dynamics in hard real-time (over 1000 fps), computed under arbitrary rigged or skeletal motion. We demonstrate how to perform multi-model reduction of FEM nonlinear elasticity, where separate reduced models are precomputed around a representative set of object poses, and then combined at runtime into a single fast dynamic system using subspace interpolation.

To produce compelling and artist-controllable FEM dynamics, the choices of material elasticity and damping properties are critically important.This talk will also present an intuitive and interactive design method to explore the high-dimensional space of material and damping for FEM simulations. In particular, I will talk about how to design arbitrary nonlinear elasticity with 1-D spline curves, how to interactively optimize heterogeneous material distributions by model reduction in material space, and how to design anisotropic nonlinear damping in an artist-directable way in the space of example deformations. Our method enables us to better capture real-world dynamics and generate effects that are not possible with previous models.

讲者简介:

Hongyi Xu is a 5-year PhD student in computer science at the University of Southern California. He will join Disney Research in Zurich since September in 2017. He obtained his Bachelor degree with honors from Zhejiang University in 2012. His research interests are in computer graphics, physically based simulation, interactive physics, computational fabrication, contact, haptics and geometric modeling.

 

报告嘉宾2:费昀,美国哥伦比亚大学

报告时间:2017720日(星期四)晚20:45-21:30(北京时间)

主持人:许威威,浙江大学(个人主页:http://www.cad.zju.edu.cn/home/weiweixu/

论文题目:模拟液体与毛发交互的多尺度模型(A Multi-Scale Model for Simulating Liquid-Hair Interactions, Siggraph 2017)

论文作者:费昀(哥伦比亚大学)、Henrique Teles Maia(哥伦比亚大学)、Christopher Batty(滑铁卢大学)、郑昌熙(哥伦比亚大学)、Eitan Grinspun(哥伦比亚大学)

论文网址:http://libwethair.info

代码网址:https://github.com/nepluno/libWetHair

论文摘要:

头发和液体之间多样的相互作用十分复杂,并且跨越多个长度尺度,这种复杂交互在许多情况下对于有人类和动物出现的场景是至关重要的。为此,我们提出了一种新颖的多组分模拟框架,该框架用于处理湿头发动态过程中所涉及的关键物理机制。本文采用的两大基础模型分别是:用于头发的离散杆模型,及用于流体的粒子胞元模型。为了处理粘附在头发上的薄层液体,我们在每根头发上附加了一个高度场。本文的贡献在于,开发了必要的物理和数值模型来运作这个新系统及其组件之间的相互作用。我们开发了一种新的降维液体模型,以解算沿着每根毛发流动的液体运动状态,同时考虑其运动参考系和对毛发动力学的影响。基于连接它们的液体桥的几何形状,我们推导了相邻毛发之间的表面张力引起的内聚效应的模型。我们采用拖曳模型来处理头发和周围液体之间较粗糙的相互作用,并提出了新的滴液和液滴捕获方法,能够维持液体体积不变,从而在降维模型和粒子模型之间转移液体。综合以上方法,我们开发了一种有效的湿毛发模拟器,用于模拟头发翻转、动物甩毛、旋转的洗车筒,以及其他几种场景中复杂的头发聚结效应。

讲者简介:

费昀,哥伦比亚大学计算机系博士生. 2013年于清华大学软件学院获得工学学士学位。2015年于哥伦比亚大学计算机系获得理学硕士学位。2015年至今于哥伦比亚大学计算机系攻读博士学位。研究兴趣包括流体模拟、毛发模拟、声音合成等方向。曾担任Computer Animation & Virtual Worlds,Graphics Models,Pacific Graphics,VRCAI,SIGGRAPH Asia等国际期刊与会议审稿人。

 

直播链接:http://webinar.games-cn.org

You may also like...

发表评论

电子邮件地址不会被公开。 必填项已用*标注