Road surface model is basis of highway three dimension design, the key is the overlaid compute of design model and terrain model.

公路三维表面模型是公路三维设计的基础，其关键是设计模型和地表模型的叠加运算。

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Rapid Prototyping provides a new method of aiding to diagnose. A hollow three dimension model with complicated conicoid surface was built and the prototyping processing was analyzed.

建立一种表面为复杂二次曲面的空心三维实体模型，分析了该模型的快速原型方法?。

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