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With the development of 3D animation technology , as well as hardware computing power increases , the computer groups simulation technology has been rapid development , especially in the field of virtual reality simulation application of fire safety, urban planning , architectural design also played a huge role . In recent years , research has focused on public safety groups simulation in secure channel design , community planning and management , as well as emergency evacuation simulation and other aspects . The main research groups for emergency evacuation simulation related technologies , and establish a set of groups from modeling to evaluate simulation system , which involves major work , including : 1) the virtual environment geometry editing with real-time rendering , development to achieve a a three-dimensional virtual environment geometry editing software , users can use the software to edit out the three-dimensional environment to be simulated , and based on OGRE game engine rendered in real time on the computer ; 2 ) multi-level modeling of virtual environments , a top-down manner the virtual environment is divided into three layers: the topology layer , the perception layer path layer , to help identify where environmental information of a virtual pedestrian crowd simulation , and achieve a two-dimensional multi-level modeling system ; 3 ) crowd behavior modeling , as based on a virtual pedestrian the power control of the physical model, consider the three main crowd behavior under emergency evacuation : the path to follow to avoid the obstacles , collision avoidance , two-dimensional crowd Opensteer simulation system ; 4 ) group - based simulation evaluation for the emergency evacuation of the groups the simulation factor as layer decision to evacuate the location and size of the channel as well as the speed of evacuation , evacuation arrival time as the presentation layer with evacuation area density factor , the evacuation design as well as the emergency evacuation crowd behavior to provide a reference for the construction .
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