Particle system based on GPU to simulate rain and snow is widely used in virtual scene simulation for its high efficiency.
在虚拟场景中采用基于GPU的粒子系统来模拟雨雪，因其效率较高，得到了广泛的应用。
In distributed simulation system, one node connects with the others through message. In many simulation systems, 3d terrain virtual scene takes part in the whole process as a very important part.
分布式仿真系统中，各节点之间通过消息互相交流信息，3维地形虚拟场景通常在大量的仿真系统中作为重要的对象参与仿真。
This paper introduces the concept and classification of the Virtual Manufacturing and explanes its key technologies, including 3d modeling, displaying of the 3d scene and simulation of the 3d motion.
文章介绍了虚拟制造的概念和分类，并阐述了其关键技术，包括三维建模、三维场景显示和三维运动模拟。
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