Traditional CAD software being designed for the virtual design, rendering complex surface models, it is time consuming; in the design of personalized products, but also requires repeated experiments, modified to meet the demand; and so on. Therefore, the positive design of such products exist in the development of high-cost, low quality, lack of long cycles. Reverse engineering technology designed to make up for being insufficient. The use of reverse engineering can be, no matter how complex or existing products quickly into the physical model is consistent with the prototype three-dimensional CAD model, this model can be improved or innovative design. New product design is no longer just CAD software design, which can be physical model design and CAD design real and imaginary combination. Reverse engineering with rapid prototyping technology can be (RP), rapid tooling (RT) integrated to form a Rapid Product Development System.
According to the helmet of the data points，according to reverse the normal process modeling, The integrated use of software UGNX4.0 completed the three-dimensional modeling lights. On this basis the use of UGNX MoldWizard module completed die design，get a reasonable surface helmet and optimize the process parameters of the die structure. Why topics from the article, background, the significance of the results , by analyzing the various software functions and the situation in light of its own choice as the application software UGNX4.0，Solve the reverse form of data processing，Structure of Surface, Construction of entities such issues.
Key words: Helmet Point cloud Reverse engineering Surface modeling
