The visual simulation based on DIS raises a high demand on the graphics and the net processing ability of the simulation nodes, thus optimization in the modeling and choice of algorithms are required.

基于分布式交互仿真的视景仿真系统，对仿真结点的图形和网络处理能力提出较高的要求，需要在建模和算法上进行优化。

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Visual 3D terrain simulation technology is an important means of virtual reality, which deals with realistic 3D terrain modeling and 3D terrain visualization real-time drawing mainly.

三维地形可视化仿真技术是虚拟现实的重要手段之一，主要研究真实感三维地形建模和三维地形可视化的实时绘制。

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Based on use of virtual reality simulation technology for visual simulation of train operation and train accident reconstruction simulation, we made a complete visual modeling.

基于利用虚拟现实仿真技术，针对列车运行的视景模拟和列车事故的再现仿真，提出了完整的视景建模方法。

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