The 3-d geometrical model of relief valve was built by using PROE software, according to its actual structure and parameters as well as feasibility of computational mathematical model.

根据安全阀的实际结构和参数，利用三维建模软件Proe，结合计算数学模型的可行性，建立了安全阀流道的三维几何模型。

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Combined with the topographic and physiognomic maps of natural terrains, a 3-D model which generates the geometrical structures of complex terrain, has been developed.

结合自然地表的地形地貌图，建立了复杂自然地表三维几何结构生成模型。

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In this paper, we first focus on the CAD-based object model construction and then introduce a rule-based method to precompile this geometrical model into a match tree for 3-d object orientation.

集中阐述了基于CAD的物体模型建立过程，并介绍了一种基于规则的将物体几何模型予编译为匹配树的三维物体定位方法。

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