Hybrid long-range collision avoidance for crowd simulation

Abhinav Golas, Rahul Narain, Ming Lin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

36 Scopus citations


Local collision avoidance algorithms in crowd simulation often ignore agents beyond a neighborhood of a certain size. This cutoff can result in sharp changes in trajectory when large groups of agents enter or exit these neighborhoods. In this work, we exploit the insight that exact collision avoidance is not necessary between agents at such large distances, and propose a novel algorithm for extending existing collision avoidance algorithms to perform approximate, long-range collision avoidance. Our formulation performs long-range collision avoidance for distant agent groups to efficiently compute trajectories that are smoother than those obtained with state-of-the-art techniques and at faster rates. Another issue often sidestepped in existing work is that discrete and continuum collision avoidance algorithms have different regions of applicability. For example, low-density crowds cannot be modeled as a continuum, while high-density crowds can be expensive to model using discrete methods. We formulate a hybrid technique for crowd simulation which can accurately and efficiently simulate crowds at any density with seamless transitions between continuum and discrete representations. Our approach blends results from continuum and discrete algorithms, based on local density and velocity variance. In addition to being robust across a variety of group scenarios, it is also highly efficient, running at interactive rates for thousands of agents on portable systems.

Original languageEnglish (US)
Title of host publicationProceedings - I3D 2013
Subtitle of host publicationACM SIGGRAPH Symposium on Interactive 3D Graphics and Games
Number of pages8
StatePublished - Mar 21 2013
Externally publishedYes
Event17th ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games, I3D 2013 - Orlando, FL, United States
Duration: Mar 21 2013Mar 23 2013

Publication series

NameProceedings of the Symposium on Interactive 3D Graphics


Other17th ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games, I3D 2013
Country/TerritoryUnited States
CityOrlando, FL


  • Collision avoidance
  • Crowd simulation
  • Hybrid algorithms
  • Lookahead


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