Generating Upper‐Body Motion for Real‐Time Characters Making their Way through Dynamic Environments

Real‐time character animation in dynamic environments requires the generation of plausible upper‐body movements regardless of the nature of the environment, including non‐rigid obstacles such as vegetation. We propose a flexible model for upper‐body interactions, based on the anticipation of the cha...

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Bibliographic Details
Published in:Computer graphics forum Vol. 41; no. 8; pp. 169 - 181
Main Authors: Alvarado, Eduardo, Rohmer, Damien, Cani, Marie‐Paule
Format: Journal Article
Language:English
Published: Oxford Blackwell Publishing Ltd 01.12.2022
Wiley
Subjects:
Animation
Barriers
CCS Concepts
Computer Science
Computing methodologies → Animation
Controllers
Dynamic response
Graphics
Kinematics
Stiffness
ISSN:0167-7055, 1467-8659
Online Access:Get full text
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Summary:Real‐time character animation in dynamic environments requires the generation of plausible upper‐body movements regardless of the nature of the environment, including non‐rigid obstacles such as vegetation. We propose a flexible model for upper‐body interactions, based on the anticipation of the character's surroundings, and on antagonistic controllers to adapt the amount of muscular stiffness and response time to better deal with obstacles. Our solution relies on a hybrid method for character animation that couples a keyframe sequence with kinematic constraints and lightweight physics. The dynamic response of the character's upper‐limbs leverages antagonistic controllers, allowing us to tune tension/relaxation in the upper‐body without diverging from the reference keyframe motion. A new sight model, controlled by procedural rules, enables high‐level authoring of the way the character generates interactions by adapting its stiffness and reaction time. As results show, our real‐time method offers precise and explicit control over the character's behavior and style, while seamlessly adapting to new situations. Our model is therefore well suited for gaming applications.
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ISSN:0167-7055
1467-8659
DOI:10.1111/cgf.14633