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Exploring Ragdoll Physics in Crowd Disaster Simulation

Published online by Cambridge University Press:  31 October 2024

Alexander H Chang
Affiliation:
Lewis Katz School of Medicine, Philadelphia, PA, USA
Aedan Ting
Affiliation:
Lewis Katz School of Medicine, Philadelphia, PA, USA
Edbert B Hsu
Affiliation:
The Johns Hopkins Office of Critical Event Preparedness and Response, Baltimore, MD, USA
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Abstract

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Objective

This study explores the feasibility of applying ragdoll physics, a procedural animation, and related game-engine technologies to create real-time simulations for investigating crowd disasters.

Methods

We harnessed the power of the Unity Game Engine to develop real-time simulation for the dynamics of a crowd disaster with rendering of scene objects and user interface (UI) elements. Humanoid agents with trigger colliders were linked to color schemes representing impact forces sustained with lethal thresholds ranging from 500 to 550 pounds force for males and 450 to 500 pounds force for females. The simulation enables users to manipulate parameters such as population, crowd density, directional movement and forces applied.

Results

Our simulation showcases an animated real-time depiction of a crowd disaster and enables visualization of casualties, both injured and dead, based upon a quantitative evaluation of the forces sustained.

Conclusions

Utilization of the Unity Game Engine for the development of visually-engaging real-time crowd disaster simulation has promising outcomes. This novel approach for modeling and analysis of crowd dynamics may provide valuable insights with applications in mass gatherings, crowd management, safety, and preparedness.

Type
Abstract
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of Society for Disaster Medicine and Public Health, Inc
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