advertisement

crowd

40 %
60 %
advertisement
Information about crowd
News-Reports

Published on April 17, 2008

Author: Doride

Source: authorstream.com

advertisement

An Event-Driven Approach to Human Crowd Simulation with Example Motions:  An Event-Driven Approach to Human Crowd Simulation with Example Motions OUTLINE:  Motivation Basic Idea Related Work Overview Initializer Behavior Generation Motion Generation Results Conclusion OUTLINE 1. Motivation:  1. Motivation Crowd Scenes Commonplace in computer games and feature films Evolving from the interactions among individual members and their interactions with the environment Highly dynamic and complex An Event-driven Approach to Human Crowd Simulation with Example Motions Why example motions?:  To generate realistic motions efficiently. How? Motion capture and reuse. On–line motion blending. [Park et al. 2002] Why example motions? Why “Event – driven” ?:  Why not employing a fixed–time advancing scheme? Well, …… Some well–known characteristics of crowds : Members clustered together very closely. Living creatures to actively interact with each other and also with the environment.  Adaptive correcting behaviors to dynamically changing situations even during a time step !!! Why “Event – driven” ? 2. Basic Idea:  2. Basic Idea Event-driven approach Guided by the external events reflecting the scenario, the behavior of a crowd evolves as intended, while adding variations due to the internal events. Live-captured motion clips 3. Related Work:  3. Related Work Non-human creatures : reactive behaviors Dynamic spatial partitioning [Reynolds 1987] Synthetic visions [Tu and Terzopoulos 1994] Pedestrian dynamics : Pedestrian crowd modelling Similar to gases and fluids [Henderson 1974] Individual pedestrian dynamics [Gipps and Markiso 1985; Helbing 1992, 1995, 2000] 3. Related Work (cont.):  3. Related Work (cont.) Behavioral rules Behavioral model of groups: Border Collies and Olympic bicycle racing [Brogan et al. 1997] ViCrowd [Musse and Thalmann 2001] Improv [Perlin and Goldberg 1996] Real-world systems Based on pedestrian dynamics together with procedural rules AntZ, The Lord of the Rings Plug-ins to MayaTM and SoftimageTM 4. Overview:  Script parser Motion Generator Event Scheduler External Event Generator Internal Event Generator Scenario Behavior Generator Example motions Event handler Initializer 4. Overview 5. Initializer:  Script Parser Scenario behavioral rules external Events Event Handler Event Scheduler 5. Initializer External Event Generator 6. Behavior Generation:  6. Behavior Generation Script Parser behavioral rules Event Handler Internal Event Generator Event Scheduler External Event Generator Motion Generatior External event Event Candidate Internal Event Motion specification Event-Driven Paradigm:  Event-Driven Paradigm External events Internal events (candidate) Internal Event Prediction:  Internal Event Prediction Predicting two candidate internal events for a crowd member A candidate resetting event A candidate colliding event Why candidates? Space Subdivision:  Space Subdivision Time-Varying Bounds:  Time-Varying Bounds Assumptions - moving trajectories unknown - bounded acceleration Time – varying bounds Uncertainty in future facilitating interactions r Slide16:  Registration of Time-varying Bounds (C(sk)) R(sk) C(sk) sk ℓ 2ℓ A time-varying bound sk is said to be registered in a subspace C(sk) if the center of sk was contained in C(sk) at its most recent event time. C(sk), R(sk), and R(sk) 3ℓ Slide17:  Candidate Resetting Event Generation (C(sk)) R(sk) C(sk) Sk = {all time-varying bounds registered in (R(sk)). Slide18:  Candidate Colliding Event Generation Event Handling:  Event Handling Deriving the reactions to events Updating the internal status Behavioral rules + external information How to Handle External Events:  How to Handle External Events Controlling the global flow of crowd simulation Drawing the reactions from behavioral rules Prescribing motion specifications Creating new candidate internal events How to Handle Internal Events:  How to Handle Internal Events Local interactions among crowd members Interaction with the environment Adding details to crowd behaviors A force field model of pedestrian dynamics Slide22:  Force Field Model avoiding force braking force driving force Slide23:  Driving Force global velocity control local velocity adjustment route goal Braking Force:  0 0 Braking Force Avoiding Force:  0 Avoiding Force Resetting Event Handling:  - resetting the time-varying bound sk to its initial size - probing the position xk(t) and velocity vk(t) to re-initialize the time-varying bound sk making registration change if needed. new location old location Resetting Event Handling Colliding Event Handling:  identify the neighbors and nearby objects compute the force exerted on each of colliding members reset the time-varying bounds Colliding Event Handling 7. Motion Generation:  Example motions Parameterization Motion Blending Weight Computation Time Warping Posture Blending Motion Retargeting Motion Specifications Target Motion 7. Motion Generation 8. Results:  8. Results 9. Conclusion:  9. Conclusion Event-driven approach Locomotive behaviors Collision detection + Pedestrian dynamics Future work Scripting system (scenario + behavioral rules) Sophisticated behavioral rules Generalization to other types of motions

Add a comment

Related presentations

Related pages

dict.cc Wörterbuch :: crowd :: Deutsch-Englisch-Übersetzung

Englisch-Deutsch-Übersetzung für crowd im Online-Wörterbuch dict.cc (Deutschwörterbuch).
Read more

Crowd - definition of crowd by The Free Dictionary

crowd 1 (kroud) n. 1. A large number of persons gathered together; a throng. 2. The common people; the populace. 3. A group of people united by a common ...
Read more

dict.cc | crowd | Wörterbuch Englisch-Deutsch

Übersetzung für crowd im Englisch-Deutsch-Wörterbuch dict.cc.
Read more

Crowd - Wikipedia, the free encyclopedia

Terminology. The term crowd is sometimes defined in contrast to other group nouns for collections of humans or animals, such as aggregation, audience ...
Read more

crowd - Deutsch-Übersetzung - bab.la Englisch-Deutsch ...

Übersetzung für 'crowd' im kostenlosen Deutsch-Wörterbuch. Weitere Deutsch-Übersetzungen für: capacity crowd, crowd barrier, crowd barriers, crowd ...
Read more

The IT Crowd – Wikipedia

The IT Crowd ist eine britische Sitcom, die von Graham Linehan geschrieben und von Ash Atalla für den britischen Privatsender Channel 4 produziert wurde.
Read more

The Crowd – Wikipedia

The Crowd war der Name, unter dem mehr als fünfzig Stars der britischen Musikszene 1985 gemeinsam das Rodgers-/Hammerstein-Lied You’ll Never Walk Alone ...
Read more

Crowd | Definition of Crowd by Merriam-Webster

Middle English crouden, from Old English crūdan; akin to Middle High German kroten to crowd, Old English crod multitude, Middle Irish gruth curds
Read more

Crowdfunding - Wikipedia, the free encyclopedia

Crowdfunding is the practice of funding a project or venture by raising monetary contributions from a large number of people, today often performed via ...
Read more

Crowd | Define Crowd at Dictionary.com

Crowd definition, a large number of persons gathered closely together; throng: a crowd of angry people. See more.
Read more