The quality of automotive clay models has a direct impact on the subsequent development of complete vehicles, making quality control for automotive clay models particularly critical. Engineers at Hualang 3D use the HL‑3DP 3D photogrammetry system together with the HL‑3DW 3D scanner to acquire 3D data of the automotive clay model. Targeted data comparison is then performed against the original CAD model to identify the overall deviation between the physical model and the CAD drawings. This enables a clear understanding of the quality of the automotive clay model and allows the company to make timely improvements to it.

      The use of traditional methods is not only time‑consuming but also requires massive investment, failing to meet the actual requirements of the racing team. In response to the difficulties faced by the racing team, Hualang 3D proposed a solution that adopts a 3D photogrammetry system (HL‑3DP) plus a 3D scanner (HL‑3DW) to acquire data of the racing car body and wheel arches. After obtaining the exterior data of the racing car, a racing car model is produced for wind‑tunnel experiments to test the drag coefficient.

On‑site scanning of automobile clay model 

       针对汽车油泥模型面积大，曲面很多，也较复杂，Holon三维工程师提出解决方案中使用：三维摄影测量系统HL-3DP（计算出油泥模型表面关键信息点的3D坐标值）+三维扫描仪HL-3DW（快速获取油泥模型高精度的三维数据）+逆向设计软件（将油泥模型点云数据转换为三角网格面数据），进行汽车油泥模型的二次设计。

1、前期准备工作

喷显像剂：提高样件表面底色对比度，获取更好的扫描数据。

贴标志点：使获取的数据在扫描软件中进行定位拼接。

贴编码点：使三维摄影测量系统获取物件表面3D坐标值。

2、三维摄影测量

      针对汽车油泥模型面积大的特点，Holon工程师首先使用三维摄影测量系统（HL-3DP）拍摄汽车油泥模型的多幅图像，通过三维测距方式，HOLON3DP软件自动的将这些影像结合起来经过运算之后，就可得到每一个编码点圆心的3D坐标，计算出物体表面关键信息点的3D坐标值，对大面积曲面的点云信息进行校正，大大提高三维扫描仪的整体点云拼接精度。

3、三维扫描

       将汽车油泥模型3D坐标数据导入HOLON3DS扫描系统，使用三维扫描仪HL-3DW，快速获得高精度的汽车油泥模型3D数据。该三维扫描仪具有超大的扫描幅面、便携式设计、扫描速度极快、精度高、高稳定性等特点。利用三维摄影测量系统（HL-3DP）与三维扫描仪（HL-3DW）的配合可以对大面积曲面的点云信息进行校正，大大提高三维扫描仪的整体点云拼接精度，提高工作效率。仅需要1个半小时就获得了汽车油泥模型三维数据，精度达到0.15mm。利用获取的汽车油泥模型三维数据，加快汽车油泥模型制作，减少了后期数据采集的难度，给其他相关部门提供可靠的参数,加快了整车的开发。

汽车油泥模型点云数据

STL data of automotive clay model

STL data of automotive clay model