This paper describes the development of a detailed 3D geometric model of an acoustical guitar. Modeling an instrument is a sophisticated task considering the individual parts and their complex shapes. The geometry of the parts visible from the outside can be measured using appropriate tools, but it is very difficult to measure the details of the internal parts like bracing, heels, and other features by hand through the sound hole. Otherwise, it would be necessary to disassemble the guitar to measure the precise position and dimensions of the parts inside it. Reassembling the guitar could result in improper functioning. To avoid damaging the instrument by disassembling or taking inaccurate measurements through the sound hole, a computer tomography (CT) scan of the guitar body was performed. Using this method, cross-sectional images of the guitar body in all the three dimensions were extracted with 1 mm spacing between adjacent images. In total, approximately 2000 images were generated and used in developing the geometric model of the guitar. The 3D model will be further used to develop a vibro-acoustic simulation model of the guitar

翻译：本文阐述了一种声学吉他详细三维几何模型的开发过程。对乐器进行建模是一项复杂的任务，需考虑其各个部件及其复杂形状。借助适当工具可测量外部可见部件的几何形状，但通过音孔手工测量内部部件（如音梁、琴踵等）的细节极为困难。否则，需拆卸吉他才能精确测量内部部件的位置和尺寸。重新组装吉他可能导致其功能异常。为避免因拆卸损坏乐器或通过音孔测量不准确，我们对吉他琴体进行了计算机断层扫描。采用此方法后，以相邻图像间距1毫米提取了吉他琴体所有三个维度的横截面图像。共生成约2000张图像，用于开发吉他的几何模型。该三维模型将进一步用于建立吉他的振动声学仿真模型。