One of the methods used by industrial designers in product modeling design is forward design, which is a process from conceptual design to CAD modeling, NC programming and NC machining, as shown in figure 1. This design process has a large difficulty coefficient, long cycle and high cost, which is not conducive to product development. In the design and manufacture of aircraft, automobiles, arts and crafts, molds and other industries, it is usually composed of complex free-form surfaces, which is difficult to be described by strict and unified mathematical language in the conceptual design stage. The initial models of these products are generated digitally by making wooden or clay models in advance. In recent years, the reverse design method has gradually matured in product modeling design. Because the reverse design of product modeling has the characteristics of high starting point, low cost, short cycle and easy modification and innovation, it has attracted the attention of modern industrial designers since its appearance. At present, this technology has been widely used in the following aspects: a. It is used to repair and modify the design of complex curved products such as automobiles and motorcycles; B. It is used to design and manufacture personalized products, such as body fitting, spacesuit design, prosthetic design, etc. C. This technology can greatly improve the degree of automation when designing molds according to customer samples; D. When the sample lacks graphic files, reverse design can be used to generate graphic files. E in rapid prototyping manufacturing, reverse design can realize rapid and accurate modeling and redesign of prototype products. I copied it. You can have a look at this website. /question/ 15783600.html？ si=8