Fused deposition modeling (FDM) process construct a three-dimensional model by stacking solid materials.Therefore, it is necessary to obtain the data of the model for later digital processing , such as model block, repair, slice and intraplate path planning .At this stage, most data processing is based on STL file data for-mat, but STL file data there is data redundancy , low geometric accuracy , easy to produce errors and other short-comings, in some high precision requirements do not apply .In order to compensate for the above shortcomings , there has been a direct parametric 3D model for data processing technology .The technology based on IGES file da-ta, to achieve the model of data processing .And in order to achieve the IGES file processing , you must achieve the IGES file decoding work .Aiming at the above problems , a method based on VS 2008 platform was proposed was proposed to realize data analysis and storage of IGES files , and to unify the extracted entity information with NURBS curve surface.Finally, the reproduction function of the model based on OpenGL canbe realized , and a platform for later model data processing was provided .%熔融沉积(Fused Deposition Modeling,FDM)工艺通过逐层堆积实体材料构成三维模型,因此需要获得模型的数据对模型进行后期的数字化处理,如模型分块、修复、切片、层片内路径规划等.在现阶段,大多数数据处理采用的都是基于STL文件的数据格式,但STL文件数据存在数据冗余,几何精度低,容易产生错误等缺点,在一些对精度要求高的场合不适用.为了弥补以上不足,出现了直接对参数化的三维模型进行数据处理的技术.该技术基于IGES文件数据,实现对模型的数据处理.而要想实现对IGES文件的处理,必须实现对IGES文件的解码工作.针对以上问题,提出了基于VS2008平台,实现对IGES文件进行数据解析、存储,并将提取的实体信息用NURBS曲线曲面统一表示,最后基于OpenGL实现对模型的再现功能,为后面模型数据处理提供平台.
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