In the early design stage, automotive modeling should both meet the requirements of aesthetics and engineering. Therefore, a vehicle CAD (computer aided design) model that can be easily adjusted by feedbacks is necessary. Based on CE-Bézier surface, this paper presents a set of algorithms for parametric segmentation and fairing surface generation in a car model. This model is defined by a simplified automotive template and relevant control points, shape parameters and segmentation parameters, which can be modified to alter the car form efficiently. With this model and the corresponding adjustment method, more than fifty various vehicle models are established in this research according to different parameters. And two methods for calculating similarity index between car models are constructed, which are suitable for brand design trend analysis and modelling design decision-making.

中文翻译：

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基于形状参数的汽车模板计算机辅助设计方法及其应用

在设计的早期阶段，汽车建模应同时满足美学和工程学的要求。因此，需要能够通过反馈容易地调整的车辆CAD（计算机辅助设计）模型。基于CE-Bézier曲面，本文提出了一组用于汽车模型中参数分割和光顺曲面生成的算法。该模型由简化的汽车模板以及相关的控制点，形状参数和分段参数定义，可以对其进行修改以有效地更改汽车形状。利用该模型和相应的调整方法，本研究根据不同的参数建立了五十多种汽车模型。构造了两种计算汽车模型相似性指标的方法：