支持协同工作的VRML网络虚拟现实系统

VRML-based Internet VR System for Collaborative Working

针对网络通信的带宽和延时问题,是制约网络虚拟现实发展与普及的关键因素。为解决实时性传输问题,通常的做法是将网络虚拟现实系统建立在高性能计算机、宽带网络、以及新的网络协议(如VRTP)之上,造成代价过高。为了在不改变现有网络带宽和网络协议的前提下实现CSCW,提出一种支持协同工作的VRML网络虚拟现实系统。通过利用细节层次模型和按需传输方法,实现了用户工作空间的快速生成;通过构建多用户通信环境和构造通信数据包,保证了通信的实时性;通过引入操作令牌思想和碰撞检测技术,实现了对象模型的协同并行控制。通过仿真实例,结果表明,提出的网络虚拟现实系统满足低带宽、实时性要求,碰撞检测机制合理,具有一定的实用价值。

The bandwidth and delay of network are key factors affecting the development and popularization of the VR based on network. The most wildly adopted measure is to build it on the platform with high cost, including high - performance computer, high - bandwidth network and new protocol such as VRTP. To realize CSCW without changing the existing bandwidth and network protocol, this paper presents a VRML network VR for supporting cooperation. The system can build the customer work space quickly thorough the LOD and according to the need of transmission method. By building user＇ s communication environment and correspondence data, it promises the real time of network correspondence. By introducing the idea of operation token and conflict checking, it can make multi - customers operate simultaneously, and realize the parallel control of object model. At the end, the paper presents an application example. The result shows that the network VR system presented is usable for low bandwidth, real time environment, has reasonable conflict checking mechanism and is practicable.