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proceedings - SAP 2015: acm siggraph symposium on applied perception

Proceedings - SAP 2015: ACM SIGGRAPH Symposium on Applied Pe...

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acm siggraph symposium on applied perception, SAP 2015

ISBN: (纸本)9781450338127

The proceedings contain 28 papers. The topics discussed include: perception of strength and power of realistic male characters;avatar preference selection in game design based on color theory;perception of personality through eye gaze of realistic and cartoon models;analyzing and predicting anisotropic effects of BRDFs;multimodal perception of material properties;sackcloth or silk? the impact of appearance vs dynamics on the perception of animated cloth;egocentric distance perception in the oculus Rift (DK2);evoking and assessing vastness in virtual environments;the effects of minification and display field of view on distance judgments in real and HMD-based environments;evaluation of the impact of high frame rates on legibility in S3D film;and 4-D spatial perception established through hypercube recognition tasks using interactive visualization system with 3-D screen.

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User sensitivity to speed- and height-mismatch in VR 16

User sensitivity to speed- and height-mismatch in VR

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SAP '16:proceedings of the acm symposium on applied perception

作者： Veronica U. Weser Joel Hesch Johnny Lee Dennis R. Proffitt University of Virginia Google Inc. Mountain View CA

ISBN: (纸本)9781450343831

Facebook's purchase of Oculus VR in 2014 ushered in a new era of consumer virtual reality head-mounted displays (HMDs). Converging technological advancements in small, high-resolution displays and motion-detection devices propelled VR beyond the purview of high-tech research laboratories and into the mainstream. However, technological hurdles still remain. As more consumer grade products develop, user comfort and experience will be of the utmost importance. One of the biggest issues for HMDs that lack external tracking is drift in the user position and rotation sensors. Drift can cause motion sickness and make stationary items in the virtual environment to appear to shift in position. For developers who seek to design VR experiences that are rooted in real environments, drift can create large errors in positional tracking if left uncorrected over time. Although much of the current VR hardware makes use of external tracking devices to mitigate positional and rotational drift, the creation of head-mounted displays that can operate without the use of extremal tracking devices would make VR hardware more portable and flexible, and may therefore be a goal for future development. Until technology advances sufficiently to completely overcome the hardware problems that cause drift, software solutions are a viable option to correct for it. It may be possible to speed up and slow down users as they move though the virtual world in order to bring their tracked position back into alignment with their position in the real world. If speed changes can be implemented without users noticing the alteration, it may offer a seamless solution that does not interfere with the VR experience. In Experiments 1 and 2, we artificially introduced speed changes that made users move through the VR environment either faster than or slower than their actual real-world speed. Users were tasked with correctly identifying when they were moving at the correct true-to-life speed when compared to an alt

关键词： human perception and performance

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Upper body leaning can affect forward self-motion perception in virtual environments 15

Upper body leaning can affect forward self-motion perception...

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3rd acm symposium on Spatial User Interaction, SUI 2015

作者： Kruijff, Ernst Riecke, Bernhard E. Trepkowski, Christina Kitson, Alexandra Bonn-Rhein-Sieg University of Applied Sciences Grantham-Allee 20 Sankt Augustin53757 Germany Simon Fraser University 250 13450 102 Avenue SurreyBCV3T 0A3 Canada

ISBN: (纸本)9781450337038

The study of locomotion in virtual environments is a diverse and rewarding research area. Yet, creating effective and intuitive locomotion techniques is challenging, especially when users cannot move around freely. While using handheld input devices for navigation may often be good enough, it does not match our natural experience of self-motion in the real world. Frequently, there are strong arguments for supporting body-centered selfmotion cues as they may improve orientation and spatial judgments, and reduce motion sickness. Yet, how these cues can be introduced without having to allow for physical user motion is not well understood. Actuated solutions such as motion platforms can be an option, but they are expensive and difficult to maintain. Alternatively, within this article we focus on the effect of upperbody tilt while users are seated, as previous work has indicated positive effects on self-motion perception. We report on two studies that investigated the effects of static and dynamic upper body leaning on perceived distances traveled and self-motion perception (vection). Static leaning (i.e., keeping a constant forward torso inclination) had a positive effect on self-motion, while dynamic torso leaning showed mixed results. We discuss these results and identify further steps necessary to design improved embodied locomotion control techniques that do not require actuated motion platforms. © 2015 acm.

关键词： Virtual reality

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Evaluating the perception of group emotion from full body movements in the context of virtual crowds 14

Evaluating the perception of group emotion from full body mo...

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11th acm symposium on applied perception, SAP 2014

作者： Carretero, Miguel Ramos Qureshi, Adam Peters, Christopher School of Computer Science and Communication KTH Royal Institute of Technology Stockholm Sweden Department of Psychology Edge Hill University Ormskirk United Kingdom

ISBN: (纸本)9781450330091

Simulating the behavior of crowds of artificial entities that have humanoid embodiments has become an important element in computer graphics and special effects. However, many important questions remain in relation to the perception of social behavior and expression of emotions in virtual crowds. Specifically, few studies have considered the role of background context on the perception of the full-body emotion expressed by sub-constituents of the crowd i.e. individuals and small groups. In this paper, we present the results of perceptual studies in which animated scenes of expressive virtual crowd behavior were rated in terms of their valence by participants. The behaviors of a task-irrelevant crowd in the background were altered between neutral, happy and sad in order to investigate effects on the perception of emotion from task-relevant individuals in the foreground. Effects of the task irrelevant background on ratings of foreground characters were found, including cases that accompanied negatively valenced stimuli. © 2014 acm.

关键词： Social behavior

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Perceptual evaluation of cardboarding in 3D content visualization 14

Perceptual evaluation of cardboarding in 3D content visualiz...

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11th acm symposium on applied perception, SAP 2014

作者： Chapiro, Alexandre Diamanti, Olga Poulakos, Steven O'Sullivan, Carol Smolic, Aljoscha Gross, Markus Disney Research Zurich Switzerland ETH Zurich Switzerland Disney Research Los Angeles United States

ISBN: (纸本)9781450330091

A pervasive artifact that occurs when visualizing 3D content is the so-called "cardboarding" effect, where objects appear flat due to depth compression, with relatively little research conducted to perceptually quantify its effects. Our aim is to shed light on the subjective preferences and practical perceptual limits of stereo vision with respect to cardboarding. We present three experiments that explore the consequences of displaying simple scenes with reduced depths using both subjective ratings and adjustments and objective sensitivity metrics. Our results suggest that compressing depth to 80% or above is likely to be acceptable, whereas sensitivity to the cardboarding artifact below 30% is very high. These values could be used in practice as guidelines for commonplace depth mapping operations in 3D production pipelines. © 2014 acm.

关键词： Stereo vision

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Does render style affect perception of personality in virtual humans? 14

Does render style affect perception of personality in virtua...

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11th acm symposium on applied perception, SAP 2014

作者： Zibrek, Katja McDonnell, Rachel Graphics Vision and Visualisation Group Trinity College Dublin Ireland

ISBN: (纸本)9781450330091

Delivering appealing virtual characters conveying personality is becoming extremely important in the entertainment industry and beyond. A theory called the 'Uncanny Valley' has been used to describe the phenomenon that the appearance of a virtual character can contribute to negative/positive audience reactions to that character [Mori 1970]. Since the style used to render a character strongly changes the appearance, we investigate whether a difference in render style can indirectly influence audience reaction, which we measure based on perception of personality. Based on psychology research, we first scripted original character dialogues in order to convey a range of ten typical personality types. Then, a professional actor was recruited to act out these dialogues, while his face and body motion and audio were recorded. The performances were mapped onto a virtual character rendered in two styles that differ in appearance: an appealing cartoon style and unappealing ill style (Figure 1). In our experiment, participants were asked questions about the character's personality in order for us to test if the difference in render style causes differences in personality perception. Our results found an indirect effect of render style where the cartoon style was rated as having a more agreeable personality than the ill style. This result has implications for developers interested in creating appealing virtual humans, avoiding the 'Uncanny Valley' phenomenon. © 2014 acm.

关键词： Landforms

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proceedings - APGV 2011: acm siggraph symposium on applied perception in graphics and visualization

Proceedings - APGV 2011: ACM SIGGRAPH Symposium on Applied P...

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8th Annual symposium on applied perception in graphics and visualization, APGV 2011

ISBN: (纸本)9781450308892

The proceedings contain 31 papers. The topics discussed include: using eye-tracking to assess different image retargeting methods;modeling and animating eye blinks;measuring gaze depth with an eye tracker during stereoscopic display;computational visual attention systems and their cognitive foundation: a survey;perceiving alterations in trajectories while throwing in a virtual environment;peripheral visual information and its effect on distance judgments in virtual and augmented environments;the influence of avatar (self and character) animations on distance estimation, object interaction and locomotion in immersive virtual environments;evaluation of walking in place on a wii balance board to explore a virtual environment;bimodal perception of audio-visual material properties for virtual environments;and perceptual considerations for motion blur rendering.

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Fast global illumination for interactive volume visualization 13

Fast global illumination for interactive volume visualizatio...

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17th acm siggraph symposium on Interactive 3D graphics and Games, I3D 2013

作者： Zhang, Yubo Ma, Kwan-Liu UC Davis United States

ISBN: (纸本)9781450319560

High quality global illumination can enhance the visual perception of depth cue and local thickness of volumetric data but it is seldom used in scientific visualization because of its high computational cost. This paper presents a novel grid-based illumination technique which is specially designed and optimized for volume visualization purpose. It supports common light sources and dynamic transfer function editing. Our method models light propagation, including both absorption and scattering, in a volume using a convection-diffusion equation that can be solved numerically. The main advantage of such technique is that the light modeling and simulation can be separated, where we can use a unified partial-differential equation to model various illumination effects, and adopt highly-parallelized grid-based numerical schemes to solve it. Results show that our method can achieve high quality volume illumination with dynamic color and opacity mapping and various light sources in real-time. The added illumination effects can greatly enhance the visual perception of spatial structures of volume data. © 2013 acm.

关键词： Volume rendering

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Environment maps and the perception of shape from mirror reflections 13

Environment maps and the perception of shape from mirror ref...

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2013 acm symposium on applied perception, SAP 2013

作者： Faisman, Arthur Langer, Michael School of Computer Science McGill University Canada

ISBN: (纸本)9781450322621

Environment maps are commonly used in computer graphics to approximate the appearance of smoothly curved surfaces with mirror-like reflectance. Perceiving the shape of such surfaces is a challenging task for the visual system, however, because the image intensities are determined both by the surface shape and by the environment [Fleming et al. 2004]. Here we extend our recent study of the perception of qualitative shape of mirror surfaces [Faisman and Langer 2013] by examining more closely how qualitative shape perception varies with the environment maps that are used.

关键词： environment maps lighting mirror perception shape

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An evaluation of flow field visualization with internal views 13

An evaluation of flow field visualization with internal view...

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2013 acm symposium on applied perception, SAP 2013

作者： Walker, James Ma, Jun Kuhl, Scott A. Wang, Chaoli Michigan Technological University United States

ISBN: (纸本)9781450322621

One popular area of research in data visualization is using streamlines to display flow fields, which depict the movement of fluids through a space. Most of the research to date has focused on external visualizations; that is, observing flow fields from outside the boundaries of the data set (e.g., Tao et al. [2013]). This research explores the efficacy of visualizing flow fields internally using an algorithm we developed to automatically compute paths through flow field interiors that provide a high degree of useful information.

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