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Do Geometric Models Affect Judgments of Human Motion?

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arXiv 2023年

作者： Hodgins, Jessica K. O’Brien, James F. Tumblin, Jack College of Computing and Graphics Visualization Usability Center Georgia Institute of Technology AtlantaGA30332-0280 United States

Human figures have been animated using a wide variety of geometric models including stick figures, polygonal models, and NURBS-based models with muscles, flexible skin, or clothing. This paper reports on experiments designed to ascertain whether a viewer’s perception of motion characteristics is affected by the geometric model used for rendering. Subjects were shown a series of paired motion sequences and asked if the two motions in each pair were "the same" or "different." The two motion sequences in each pair used the same geometric model. For each trial, the pairs of motion sequences were grouped into two sets where one set was rendered with a stick figure model and the other set was rendered with a polygonal model. Sensitivity measures for each trial indicate that for these sequences subjects were better able to discriminate motion variations with the polygonal model than with the stick figure model. © 2023, CC BY-SA.

关键词： Sensitivity analysis

Automatic Joint Parameter Estimation from Magnetic Motion Capture Data

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arXiv 2023年

作者： O’Brien, James F. Bodenheimer, Robert E. Brostow, Gabriel J. Hodgins, Jessica K. College of Computing and Graphics Visualization and Usability Center Georgia Institute of Technology 801 Atlantic Drive AtlantaGA30332-0280 United States

This paper describes a technique for using magnetic motion capture data to determine the joint parameters of an articulated hierarchy. This technique makes it possible to determine limb lengths, joint locations, and sensor placement for a human subject without external measurements. Instead, the joint parameters are inferred with high accuracy from the motion data acquired during the capture session. The parameters are computed by performing a linear least squares fit of a rotary joint model to the input data. A hierarchical structure for the articulated model can also be determined in situations where the topology of the model is not known. Once the system topology and joint parameters have been recovered, the resulting model can be used to perform forward and inverse kinematic procedures. We present the results of using the algorithm on human motion capture data, as well as validation results obtained with data from a simulation and a wooden linkage of known dimensions. © 2023, CC BY-SA.

关键词： Parameter estimation

Animating Sand, Mud, and Snow

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arXiv 2023年

作者： Sumner, Robert W. O’Brien, James F. Hodgins, Jessica K. College of Computing and Graphics Visualization Usability Center Georgia Institute of Technology 801 Atlantic Drive AtlantaGA30332-0280 United States

Computer animations often lack the subtle environmental changes that should occur due to the actions of the characters. Squealing car tires usually leave no skid marks, airplanes rarely leave jet trails in the sky, and most runners leave no footprints. In this paper, we describe a simulation model of ground surfaces that can be deformed by the impact of rigid body models of animated characters. To demonstrate the algorithms, we show footprints made by a runner in sand, mud, and snow as well as bicycle tire tracks, a bicycle crash, and a falling runner. The shapes of the footprints in the three surfaces are quite different, but the effects were controlled through only five essentially independent parameters. To assess the realism of the resulting motion, we compare the simulated footprints to video footage of human footprints in sand. © 2023, CC BY-SA.

关键词： Animation

Designing information awareness applications in tcl/tk 7

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Designing information awareness applications in tcl/tk

7th USENIX Tcl/Tk Conference, TCL/TK 2000

作者： Zhao, Q. Alex McCrickard, D. Scott And Usability Center College of Computing Georgia Institute of Technology Atlanta Graphics VisualizationGA30332-0280 United States

Supporting information awareness using animated widgets 7

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Supporting information awareness using animated widgets

7th USENIX Tcl/Tk Conference, TCL/TK 2000

作者： McCrickard, D. Scott graphics, Q. Alex Zhao And Usability Center and College of Computing Georgia Institute of Technology Atlanta VisualizationGA30332-0280 United States

This paper describes a Tcl/Tk widget set extension that supports three animated be-haviors: Fading, tickering, and rolling. This extension is targeted for use in informa-tion awareness applications that monitor and communicate constantly changing informa-tion. Described is the programming interface for the widgets as well as the design deci-sions made in creating them and programs that use them. Introduced in the descrip-tion are two new techniques called automatic markups and history-based shadowing, high-lighting techniques used to identify and com-municate the nature of the changes. © USENIX *** right reserved.

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IDEAS: Immersive dome experiences for accelerating science

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arXiv 2019年

作者： Faherty, Jacqueline K. SubbaRao, Mark Wyatt, Ryan Ynnerman, Anders deGrasse Tyson, Neil Geller, Aaron Weber, Maria Rosenfield, Philip Stoeckle, Gabriel Weiskopf, Daniel Magnor, Marcus Williams, Peter K.G. Abbott, Brian Marchetti, Lucia Jarrrett, Thomas Fay, Jonathan Peek, Joshua Graur, Or Durrell, Patrick Homeier, Derek Preston, Heather Müller, Thomas Vos, Johanna M. Brown, David Godfrey, Paige Giorla Rice, Emily Gagliuffi, Daniella Bardalez Bock, Alexander American Museum of Natural History Hayden Planetarium Adler Planetarium International Planetarium Society California Academy of Sciences Linköping University Adler Planetarium University of Chicago AAS WorldWide Telescope Instituto de Astronomiá UNAM Natural History Museum Vienna Austria Visualization Research Center University of Stuttgart Computer Graphics Lab TU Braunschweig Center for Astrophysics | Harvard & Smithsonian American Astronomical Society American Museum of Natural History Hayden Planetarium University of Cape Town Iziko Planetarium & Digital Dome Space Telescope Science Institute Johns Hopkins University Youngstown State University Ward Beecher Planetarium Förderkreis Planetarium Göttingen Germany Calusa Nature Center & Planetarium Haus der Astronomie MPIA Microsoft Research Slooh CUNY Macaulay Honors College Scientific Computing and Imaging Institute University of Utah

Astrophysics lies at the crossroads of big datasets (such as the Large Synoptic Survey Telescope and Gaia), open source software to visualize and interpret high dimensional datasets (such as Glue, WorldWide Telescope, and OpenSpace), and uniquely skilled software engineers who bridge data science and research fields. At the same time, more than 4,000 planetariums across the globe immerse millions of visitors in scientific data. We have identified the potential for critical synergy across data, software, hardware, locations, and content that-if prioritized over the next decade-will drive discovery in astronomical research. Planetariums can and should be used for the advancement of scientific research. Current facilities such as the Hayden Planetarium in New York City, Adler Planetarium in Chicago, Morrison Planetarium in San Francisco, the Iziko Planetarium & Digital Dome Research Consortium in Cape Town, and visualization center C in Norrköping are already developing software which ingests catalogs of astronomical and multi-disciplinary data critical for exploration research primarily for the purpose of creating scientific storylines for the general public. We propose a transformative model whereby scientists become the audience and explorers in planetariums, utilizing software for their own investigative purposes. In this manner, research benefits from the authentic and unique experience of data immersion contained in an environment bathed in context and equipped for collaboration. Consequently, in this white paper we argue that over the next decade the research astronomy community should partner with planetariums to create visualization-based research opportunities for the field. Realizing this vision will require new investments in software and human capital. Copyright © 2019, The Authors. All rights reserved.

关键词： Planetariums

Fleshing: Spine-driven bending with local volume preservation

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Fleshing: Spine-driven bending with local volume preservatio...

34th Annual Conference on European Association for Computer graphics, EUROgraphics 2013

作者： Zhuo, Wei Rossignac, Jarek Graphics Visualization and Usability Center College of Computing Georgia Tech United States

Several design and animation techniques use a one-dimensional proxyC (a spine curve in 3D) to control the deformation or behavior of a digital model of a 3D shape S. We propose a modification of these "skinning" techniques that ensures local volume preservation, which is important for the physical plausibility of digital simulations. In the proposed "fleshing" techniques, as input, we consider a smooth spine C0, a model S0 of a solid that lies "sufficiently close" to C0, and a deformed version C1 of C0 that is "not overly bent". (We provide a precise characterization of these restrictions.) As output, we produce a bijective mapping M, that maps any point X of S onto a point M(X) of M(S). M satisfies two properties: (1) The closest projection of X on C0 and of M(X) on C1 have the same arc length parameter. (2) U and M(U) have the same volume, where U is any subset of S. We provide three different closed form expressions for radial, normal and binormal fleshing and discuss the details of their practical real-time implementation. © 2013 The Eurographics Association and Blackwell Publishing Ltd.

关键词： Real time control

ICEbox: Toward easy-to-use home networking

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ICEbox: Toward easy-to-use home networking

11th IFIP TC 13 International Conference on Human-Computer Interaction, INTERACT 2007

作者： Jeonghwa, Yang Edwards, W. Keith Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology

ISBN: (纸本)9783540747994

Home networking is becoming an essential part of everyday life. However, empirical studies and consumer reports indicate that the complexities of configuring and maintaining the home network impose a high barrier for most householders. In this paper, we explore the sources of the complexity of the home network, and describe a solution we have built to address this complexity. We have developed a prototype network appliance that acts as a centralized point of control for the home network, providing device provisioning and reprovisioning, security, discovery, and monitoring. Our solution provides a simple physical UI for network control, using pointing to introduce new devices onto the network, and a physical lock to secure network access. Results of our user studies indicate that users found this appliance both useful and usable as a network configuration and management tool. © IFIP International Federation for Information Processing 2007.

关键词： Human computer interaction

ICEbox: Toward easy-to-use home networking

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ICEbox: Toward easy-to-use home networking

11th IFIP TC 13 International Conference on Human-Computer Interaction, INTERACT 2007

作者： Yang, Jeonghwa Keith Edwards, W. Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology United States

ISBN: (纸本)9783540747994

关键词： Home networks