本文综合利用虚拟现实技术、传感器技术、电机控制技术和虚拟人技术，建立和实现了以传统跑步机为基础的多媒体健身平台。首先介绍了大规模三维场景模型生成的方法，以及以OSG开源场景图形程序为接口实现三维场景渲染的技术，然后设计并实现了多角色虚拟人的运动算法，最终达到用户、虚拟场景及虚拟人之间的动态交融，使得用户可以沉浸于场景之中。

Building and implementing a multimedia bodybuilding platform based on a traditional treadmill with virtual reality, sensor technology, motor control technology and the virtual human technique. This paper introduces the method of generating largescale 3Dscenes, the technique of rendering 3Dscenes by OSG（Open Scene Graph）, and emphases on designing and implementing the virtual human motion algorithm.Finally,it reaches the dynamic interaction among the users ，the virtual scene and the virtual humans, and makes the users immerse in the scene.