Secondly it was widely adopted that the advanced three-dimensional entity digital design method, virtual prototype technique and digital simulation technique in the processing of design.
在设计过程中，广泛采用先进的三维实体数字化设计技术、虚拟样机技术和数字仿真技术。
Three-dimensional terrain is one of important factors of the natural scenes in virtual environment. It is also a significant composition of view system in virtual simulation field.
三维地形是虚拟自然环境中不可缺少的因素，也是虚拟仿真领域中视景系统的重要组成部分。
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