BEIJING, July 2 (Xinhua) -- The Communist Party of China (CPC) celebrated its centenary on Thursday with a solemn ceremony on Tian'anmen Square in Beijing. Among the technical support teams at the ceremony was a group of virtual simulation technicians who made a unique contribution.
The virtual simulation team consists of more than 40 teachers and students from Beijing Institute of Technology (BIT). Taking part in the technical support of the ceremony, they feel a strong sense of achievement and pride.
The orderly gathering and evacuation of spectators are essential for the smooth and punctual running of the ceremony. Tens of thousands of people enter and exit the square from various directions and routes, and simulation technology helps to organize gatherings and evacuations.
From the beginning of the year, the technical team started constructing the simulation system and accurately mapped out 1,200 sections of the celebration area.
"Based on high precision modeling, we carried out 3D simulations of the whole ceremony process to provide efficient and accurate technical support for the planning and organization of the ceremony," said Ding Gangyi, a professor with the Key Laboratory of Digital Performance and Simulation Technology of the BIT.
The technicians conducted large-scale 3D modeling for several months before the ceremony.
They used the information to create the optimal gathering and evacuation scheme in a virtual environment to provide reliable, real-time data and evaluation plans.
The data includes detailed information on thousands of categories, including streets, buildings, vehicles, vegetation and people. Information on more than 50 types of vehicles was collected by the virtual simulation technology to facilitate in parking.
"We also need to model the buildings according to their exact locations," said Wu Yuchen, a teacher with the BIT. The height, width, color and spacing of the virtual buildings should be consistent with the actual ones.
The accuracy of modeling and restoring the scene can reach the centimeter level.
The amount, size and shade area of the trees around the square, as well as the location, length, width and spacing of each tree pit, are needed so they can be accurately depicted on the simulation platform. The walking pace of people of different ages and the locations of each dustbin and wire pole are also simulated.
The technicians used the rangefinders to measure the distance of objects on the streets. "With more data collected, the virtual simulation has a more realistic effect," said Wu. Enditem