The model of gear profile curve and gear transition curve are the difficult but key point of gear 3d solid model.
齿廓曲线尤其是齿根过渡曲线的构建是渐开线圆柱齿轮三维实体建模的难点，也是其关键问题。
By using 3d solid model, the twist-back Angle of steam turbine twisted long blade with integral shroud was analyzed and calculated.
采用三维实体模型，对自带围带的汽轮机扭曲长叶片的扭转恢复角进行了计算分析。
As it is hard to recognize intersecting features automatically, a new method to recognize such intersecting features in 3d solid model was proposed.
针对相交特征自动识别较为困难的问题，提出一种新的三维实体模型相交特征识别方法。
The fourth chapter tells how to build 3D solid model for hull structure applying the oriented object technology, furthermore, the corresponding data structures are presented.
第四章介绍如何利用面向对象的方法建立船舶结构的三维实体模型，同时给出相关的数据结构；
The fourth chapter tells how to build 3D solid model for hull structure applying the oriented object technology, furthermore, the corresponding data structures are presented.
第四章介绍如何利用面向对象的方法建立船舶结构的三维实体模型，同时给出相关的数据结构；
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