MDC: The Virtual World Data Server

虚拟世界数据服务器是一个多用户、分布式、实时数据服务器， 用于非常大的虚拟环境模拟。该系统的核心是实时 存储服务器（RTSS）。RTSS旨在有效地存储和检索大型 数量（1 TB）的空间分布异构数据。RTSS 通过高速异步传输模式（ATM）连接与 多个交互式实时模拟。它与每个活动的 为了确定当前观看位置在哪里以及观看者在哪里 已经开始了RTSS确定需要什么样的三维信息， 以优化的方式从磁盘中检索该信息，并将其提供给仿真 以及时的方式。 RTSS由先进的三维 视景仿真系统这两个系统一起能够支持各种 要求苛刻的应用，包括（但不限于）城市规划、医疗、急救 反应、物理、建筑和城市设计。这一系统有望大幅提高 改善城市规划和科学和医学实验的方式， 可视化。它允许社区成员和感兴趣的公民了解和评估 政策和规划决策的影响，并为科学家提供能力， 可视化的数据集比今天可能的大100倍。

The Virtual World Data Server is a multi-user, distributed, real-time data server intended for very large virtual environment simulations. The heart of this system is the Real-Time Storage Server (RTSS). The RTSS is designed to efficiently store and retrieve large amounts ( 1 terabyte) of spatially distributed heterogeneous data. The RTSS communicates over high speed asynchronous transfer mode (ATM) connections with multiple interactive real-time simulations. It establishes a two-way link with each active simulation in order to determine where the current viewing position is and where the viewer is headed. The RTSS makes a determination of what 3-dimensional information is needed, retrieves that information from disk in an optimized fashion and delivers it to the simulation in a just-in-time manner. The RTSS is complemented by an advanced three-dimensional visual simulation system. Together these two systems are capable of supporting a variety of demanding applications including (but not limited to) urban planning, medical, emergency response, physics, architecture and urban design. This system promises to dramatically improve the way that cities are planned and scientific and medical experiments are visualized. It allows community members and interested citizens to understand and evaluate the impact of policy and planning decisions and it provides capabilities for scientists to visualize datasets over 100 times larger than that which is possible today.