流域虚拟仿真系统实时交互技术研究

Real-time Interactive Interface of Watershed Simulation System

流域虚拟仿真系统将数学模型计算与三维虚拟环境相融合,可有效地增强系统的直观性与交互性.通过分析概化流域数学模型的结构特征,在不改变模型原有的结构与计算逻辑的前提下,提出了按时间步长控制数学模型计算过程的方法.采用基于进程的并行算法解决计算速度问题,将虚拟现实模块与数学模型作为独立进程安排在不同的计算核心上执行,模块间的通讯方式选择网络传输.建立了以虚拟现实模块为控制中枢,各数学模型为客户端的系统总体框架,通过基于网络的指令-应答方式实现流域交互仿真功能.基于该框架实现了都江堰工程仿真中的实时交互模拟效果.

Watershed simulation syste＇m consists of the mathematical models and the three-dimensional virtual environme nt,it can enhance data＇s visibility and interactivity effectively.A method was proposed to control the watershed mathematical model process according to time step by analyzing the structure of suchlike models,and at the same time this method didn＇t change the structure and computational logic of those models.Parallel algorithm based on computer process was used to solve the problem of computing speed of the system,mathematical models and virtual reality module were put on different computing kernels as absolute computer process,and network was used to realize communication between different modules.The simulation system was established within the framework：virtual reality module was regarded as master and mathematical models were regarded as slaves,and command-response mode based on network was used to achieve interactive simulation.This framework was applied to the Dujiangyan project and realized real-time interactive simulation.