区间测试评估平台的三维交互虚拟场景子系统软件设计

区间信号系统测试评估平台是对铁路区间自动闭塞信号系统进行可靠性、安全性测试及评估的平台。三维交互的虚拟场景子系统是铁路区间信号系统测试平台的一个子系统 ,它为该平台提供了一个虚拟的现场环境。场景子系统划分为 3个子模块 :底层部分、三维模型库、铁路区间仿真部分。底层部分的设计应用了一种支持三维图形重用的动态链接库 (DLL)层次设计方法 ,从而使系统的结构更为合理。基于OpenGL的DLL能提供显示三维图形所必需的各种必要条件 ;能对三维模型库中的基本三维模型进行读取 ,并在OpenGL中重现等。场景子系统的设计中 ,描述了实体的运动层次链接关系和数据结构 ,并实现了三维虚拟场景的建模和铁路区间自动闭塞的仿真。

Software Design of the Interactive 3D Virtual Scene Subsystem of the Block Testing and Assessment Platform

The testing and assessment platform for railway block signaling is a system to test and assess the security and reliability of automatic block signaling. As one part of the system, the interactive 3D virtual scene subsystem provides a virtual scene environment for the platform. The subsystem is composed of three parts: fundamental part, 3D model library, railway block simulation part. A hierarchic method is applied in the design of the fundamental part to make a more reasonable system structure. DLL based on OpenGL provides all kinds of conditions needed to display graphs, reads the data from the 3D model library and redisplays the model in OpenGL. In the design of the subsystem, the dynamic hierarchic link and data structure of an entity are described and the modeling of the virtual scene and the railway automatic block simulation are realized.