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  • Columbia Computer Graphics Group
    Group 602 and 6LE4 CEPSR Building Schapiro Center Columbia University 2920 Broadway New York NY 10027 Home News People Publications Sponsors Sponsors Maintained by Timothy Sun and Dingzeyu Li COPYRIGHT

    Original URL path: http://www.cs.columbia.edu/cg/sponsors.php (2016-02-17)
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  • Regrasping and Unfolding of Garments Using Predictive Thin Shell Modeling
    to teach a twoarm robot to efficiently track the states of a garment from an unknown state to a known state by iterative regrasping The problem is formulated as a constrained weighted evaluation metric for evaluating the two desired grasping points during regrasping which can also be used for a convergence criterion The result is then adopted as an estimation to initialize a regrasping which is then considered as a

    Original URL path: http://www.cs.columbia.edu/~yonghao/icra15/absticra15.html (2016-02-17)
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  • Alec Jacobson
    Bounded Biharmonic Weights for Real Time Deformation Alec Jacobson Ilya Baran Jovan Popovi Olga Sorkine Communications of the ACM 2014 Research Highlights Paper Preface by Joe Warren 中国版 translated by Kun Zhou Original Project Page Ink and Ray Bas Relief Meshes for Adding Global Illumination Effects to Hand Drawn Characters Daniel Sýkora Ladislav Kavan Martin Čadík Ondřej Jamriška Alec Jacobson Brian Whited Maryann Simmons Olga Sorkine Hornung ACM Transactions on Graphics 2014 Project Page Paper Paper low resolution A Simple Method for Correcting Facet Orientations in Polygon Meshes Based on Ray Casting Kenshi Takayama Alec Jacobson Ladislav Kavan Olga Sorkine Hornung Journal of Computer Graphics Tools 2014 Paper Paper low resolution Consistently Orienting Facets in Polygon Meshes by Minimizing the Dirichlet Energy of Generalized Winding Numbers Kenshi Takayama Alec Jacobson Ladislav Kavan Olga Sorkine Hornung Technical Report 2014 Paper Schur complement trick for positive semi definite energies Alec Jacobson Technical Report 2014 Paper Bijective mappings with generalized barycentric coordinates a counterexample Alec Jacobson Journal of Graphics Tools 2013 Paper 2012 Technical Report Consistent Volumetric Discretizations Inside Self Intersecting Surfaces Leonardo Sacht Alec Jacobson Daniele Panozzo Christian Schüller Olga Sorkine Hornung Eurographics ACM SIGGRAPH Symposium on Geometry Processing 2013 Project Page Paper Paper low resolution Algorithms and Interfaces for Real Time Deformation of 2D and 3D Shapes Alec Jacobson PhD Thesis ETH Zurich 2013 Thesis Thesis low resolution Slides Slides low resolution Robust Inside Outside Segmentation using Generalized Winding Numbers Alec Jacobson Ladislav Kavan Olga Sorkine Hornung ACM SIGGRAPH 2013 Project Page Paper Paper low resolution Slides Slides low resolution Boolean Operations using Generalized Winding Numbers Alec Jacobson Technical Report 2016 Paper Transfusive Image Manipulation Kaan Yücer Alec Jacobson Alexander Hornung Olga Sorkine ACM SIGGRAPH Asia 2012 Project Page Paper Paper low resolution Smooth Shape Aware Functions with Controlled Extrema Alec

    Original URL path: http://www.cs.columbia.edu/~jacobson/ (2016-02-17)
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  • Yonghao Yue's page
    Toward Optimal Space Partitioning for Unbiased Adaptive Free Path Sampling of Inhomogeneous Participating Media Yonghao Yue Kei Iwasaki Bing Yu Chen Yoshinori Dobashi and Tomoyuki Nishita 2011 Computer Graphics Forum Vol 30 No 7 Proc of Pacific Graphics 2011 pp 1911 1919 Kaohsiung Taiwan PDF Bibtex Project Physically based designs Legolization Optimizing LEGO Designs Sheng Jie Luo Yonghao Yue Chun Kai Huang Yu Huan Chung Sei Imai Tomoyuki Nishita and Bing Yu Chen 2015 To appear in ACM Transactions on Graphics Vol 34 No 6 Proc of SIGGRAPH ASIA 2015 Kobe Japan PDF Video Bibtex Project Wire Mesh Design Akash Garg Andrew Sageman Furnas Bailin Deng Yonghao Yue Eitan Grinspun Mark Pauly and Max Wardetzky 2014 ACM Transactions on Graphics Vol 33 No 4 Proc of SIGGRAPH 2014 pp 66 1 12 Vancouver Canada PDF Video Bibtex Project Poisson Based Continuous Surface Generation for Goal Based Caustics Yonghao Yue Kei Iwasaki Bing Yu Chen Yoshinori Dobashi and Tomoyuki Nishita 2014 ACM Transactions on Graphics Vol 33 No 3 pp 31 1 7 presented at SIGGRAPH 2014 Vancouver Canada PDF Video Bibtex Project Pixel Art with Refracted Light by Rearrangeable Sticks Yonghao Yue Kei Iwasaki Bing Yu Chen Yoshinori Dobashi and Tomoyuki Nishita 2012 Computer Graphics Forum Vol 31 No 2 Proc of EUROGRAPHICS 2012 pp 575 582 Cagliari Italy PDF Video Bibtex Project An Inverse Problem Approach for Automatically Adjusting the Parameters for Rendering Clouds Using Photographs Yoshinori Dobashi Wataru Iwasaki Ayumi Ono Tsuyoshi Yamamoto Yonghao Yue and Tomoyuki Nishita 2012 ACM Transactions on Graphics Vol 31 No 6 Proc of SIGGRAPH Asia 2012 pp 145 1 10 Singapore Singapore PDF Bibtex Project Predictive simulations for smart robots Folding Deformable Objects using Predictive Simulation and Trajectory Optimization Yinxiao Li Yonghao Yue Danfei Xu Eitan Grinspun and Peter K Allen 2015

    Original URL path: http://www.cs.columbia.edu/~yonghao/ (2016-02-17)
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  • Double Bubbles Sans Toil and Trouble: Discrete Circulation-Preserving Vortex Sheets for Soap Films and Foams
    work on soap bubbles and foams by noting that their dynamics are naturally described by a Lagrangian vortex sheet model in which circulation is the primary variable This leads us to derive a novel circulation preserving surface only discretization of foam dynamics driven by surface tension on a non manifold triangle mesh We represent the surface using a mesh based multimaterial surface tracker which supports complex bubble topology changes and evolve the surface according to the ambient air flow induced by a scalar circulation field stored on the mesh Surface tension forces give rise to a simple update rule for circulation even at non manifold Plateau borders based on a discrete measure of signed scalar mean curvature We further incorporate vertex constraints to enable the interaction of soap films with wires The result is a method that is at once simple robust and efficient yet able to capture an array of soap films behaviors including foam rearrangement catenoid collapse blowing bubbles and double bubbles being pulled apart Files Paper PDF Video MP4 YouTube more bubbles Technical report Columbia Academic Commons Poster at TWIG 2015 PNG BibTeX article dbwg15 author Fang Da and Christopher Batty and Chris Wojtan and Eitan Grinspun

    Original URL path: http://www.cs.columbia.edu/cg/doublebubbles/ (2016-02-17)
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  • Computational Design of Twisty Joints and Puzzles
    an interlocking puzzle We develop a group theoretic approach to representing a wide class of twisty puzzles by establishing a connection between non blocking twisty joints and the finite subgroups of the rotation group SO 3 The theoretical foundation enables us to build an efficient system for automatically completing the set of rotation axes and fast collision detection between pieces We also generalize the Rubik s Cube mechanism to a large family of twisty puzzles Links high res paper 37M low res paper 653K supplemental data armadillo bunny 1 8M tetra 428K Video Citation Timothy Sun Changxi Zheng Computational Design of Twisty Joints and Puzzles ACM Transactions on Graphics 34 4 Proc SIGGRAPH 2015 Aug 2015 Acknowledgements We thank the anonymous reviewers for their feedback We also thank Yun Fei for assistance in preparing the video Dingzeyu Li for help on making figures and Akash Garg Yonghao Yue and Shuang Zhao for their comments on earlier drafts This research was supported in part by the National Science Foundation CAREER 1453101 and generous gifts from Intel Any opinions findings and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of funding

    Original URL path: http://www.cs.columbia.edu/cg/twisty/ (2016-02-17)
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  • Continuum Foam: A Material Point Method for Shear-Dependent Flows
    employ the Material Point Method MPM to discretize a hyperelastic constitutive relation augmented with the Herschel Bulkley model of non Newtonian plastic flow which is known to closely approximate foam behavior Since large shearing flows in foam can produce poor distributions of material points a typical MPM implementation can produce non physical internal holes in the continuum To address these artifacts we introduce a particle resampling method for MPM In addition we introduce an explicit tearing model to prevent regions from shearing into artificially thin honey like threads We evaluate our method s efficacy by simulating a number of dense foams and we validate our method by comparing to real world footage of foam Files Paper PDF Video YouTube 720p MP4 685MB BibTeX article foam15 author Yonghao Yue and Breannan Smith and Christopher Batty and Changxi Zheng and Eitan Grinspun title Continuum Foam A Material Point Method for Shear Dependent Flows journal ACM Transactions on Graphics year 2015 Acknowledgements We thank Keenan Crane for providing his digital and real face for the pie throw example as well as Henrique Teles Maia Nora Wixom and Michelle Ming Yen Lee for helping to prepare the final version of this paper and the

    Original URL path: http://www.cs.columbia.edu/cg/foam/ (2016-02-17)
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  • Computational Hydrographic Printing
    for simulating hydrographic printing process This simulation enables us to compute a color image to feed into our hydrographic system for precise texture registration We then build a physical hydrographic system upon off the shelf hardware integrating virtual simulation object calibration and controlled immersion To overcome the difficulty of handling complex surfaces we further extend our method to enable multiple immersions each with a different object orientation so the combined colors of individual immersions form a desired texture on the object surface We validate the accuracy of our computational model through physical experiments and demonstrate the efficacy and robustness of our system using a variety of objects with complex surface textures Links high res paper 14M low res paper 882K Video Citation Yizhong Zhang Chunji Yin Changxi Zheng and Kun Zhou Computational Hydrographic Printing ACM Transactions on Graphics 34 4 Proc SIGGRAPH 2015 Aug 2015 Acknowledgements We thank the anonymous reviewers for their constructive feedback the authors of Batty et al 2012 for sharing their viscous sheet simulation code and Margaret Qian for recording the voice over for the video This research was supported in part by NSFC No 61272305 the National Program for Special Support of Eminent Professionals of

    Original URL path: http://www.cs.columbia.edu/cg/hydrographics/ (2016-02-17)
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