There is no difference between strong function and weak function, only which software is good at which aspect. UG is suitable for turning drawings into surfaces, PRO-E is suitable for product development, AUTO CAD is suitable for plane production, and rhinoceros is suitable for more complicated streamlined surface design (the size is difficult to locate accurately). JDpaint software mainly designs quite complex surfaces, which cannot be defined by data, such as jade, wood carving, jewelry and other modeling figures. This is also a pretty good software for processing gadgets. CAM software is a machine-aided processing software, which is mainly used for programming (mainly processing). CAD software is computer-aided design (mainly drawing design). CATIA is used by a few people, but it is really a cow X software, which is used a lot in aviation.