Effect of Character Animacy and Preparatory Motion on Perceptual Magnitude of Errors in Ballistic Motion

Reitsma, Paul S. A.; Andrews, James; Pollard, Nancy S.

doi:10.1111/j.1467-8659.2008.01117.x

Cited by 17 publications

(21 citation statements)

References 17 publications

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“…Reitsma et al[2008] found that observers tend to overestimate the effect of gravity on ballistic motion. This may explain the low sensitivity to decreases in velocity in the Ramp block.…”

Section: Resultsmentioning

confidence: 96%

“…In this experiment, we evaluated observers' sensitivity to physical distortions in virtual throwing animations. As previous results showed a greater sensitivity to physical distortions on virtual human characters rather than on simple objects [Reitsma et al 2008], we studied the effect of using both a biological human throw and a simple physical simulation (free fall of a ball on a ramp). The results show that observers' sensitivity to errors depends on the animacy of the thrower.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluating observers' sensitivity to errors in human and physical throws

Vicovaro

Hoyet

Burigana

et al. 2012

Proceedings of the ACM Symposium on Applied Perception

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“…Reitsma et al[2008] found that observers tend to overestimate the effect of gravity on ballistic motion. This may explain the low sensitivity to decreases in velocity in the Ramp block.…”

Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Evaluating observers' sensitivity to errors in human and physical throws

Vicovaro

Hoyet

Burigana

et al. 2012

Proceedings of the ACM Symposium on Applied Perception

View full text Add to dashboard Cite

“…Other research has suggested that preparatory motion may also be an important consideration in the perceived visual quality of ballistic motion [26]. Our method does not address the preparatory or recovery phases of ballistic motion, and leaves such a task to the animator.…”

Section: Ballistic Motionsmentioning

confidence: 99%

Practical Character Physics for Animators

Shapiro

Lee

2011

IEEE Comput. Grap. Appl.

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Abstract-We describe a graphics system that significantly improves the visual quality of certain types of 3D character motion animated through traditional means by inferring physical properties and correcting the results through the use of dynamics. These physical characteristics are visualized and provide information not normally available to traditional 3D animators, such as displaying the center of mass, angular momentum and zero moment point. By comparing the original path as generated by an animator, against a proper physically-based path generated by our tool, the animator is able to interactively modify the original motion path to more closely match the generated physicsbased path. This often results in better quality character motion. Two different types of motion can be adjusted: animations which involve ballistic paths, such as falling and jumping, as well as animations involving character movement which require balance and posture, such as walking or running. This dynamics visualization method is integrated into a professional software system for use in a visual effects studio that incorporates liveaction with 3D animated characters in feature film production. Our research shows that between 10% and 16% of the shots of a character-heavy feature film will incorporate ballistic motions that may be improved by our system.

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“…Perceptual properties of these artifacts depend on many parameters, such as the character's representation [HOT98, CHK07, MJH * 07], the number of character models or animations [MLD * 08], or the artifact's type [RAP08]. The perceptual effects of a variety of anomalies in human animation was also recently studied by Hodgins et al [HJO * 10].…”

Section: Introductionmentioning

confidence: 98%

Perceptual evaluation of footskate cleanup

Pražák

Hoyet

O’Sullivan

2011

Proceedings of the 2011 ACM SIGGRAPH/Eurographics Symposium on Computer Animation

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When animating virtual humans for real-time applications such as games and virtual reality, animation systems often have to edit motions in order to be responsive. In many cases, contacts between the feet and the ground are not (or cannot be) properly enforced, resulting in a disturbing artifact know as footsliding or footskate. In this paper, we explore the perceptibility of this error and show that participants can perceive even very low levels of footsliding (<21mm in most conditions). We then explore the visual fidelity of animations where footskate has been cleaned up using two different methods. We found that corrected animations were always preferred to those with footsliding, irrespective of the extent of the correction required. We also determined that a simple approach of lengthening limbs was preferred to a more complex approach using IK fixes and trajectory smoothing.

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Effect of Character Animacy and Preparatory Motion on Perceptual Magnitude of Errors in Ballistic Motion

Abstract: An increasing number of projects have examined the perceptual magnitude of visible artifacts in animated motion

Cited by 17 publications

References 17 publications

Evaluating observers' sensitivity to errors in human and physical throws

Evaluating observers' sensitivity to errors in human and physical throws

Practical Character Physics for Animators

Perceptual evaluation of footskate cleanup

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