Rotational sweep is one of the types of sweep representation. It defined by rotating a planar curve (generator) around an axis line. So, this is coding how sweeping representation present the outer surface of a bottle water. There are two attachments

标准正弦扫描波生成程序，可任意控制频率变化范围，fotran,自写程序，源码。-Standard sine sweep wave generator, we can control the frequency range, fotran, since the writing process, the source code.