Cad system

摘要

The CAD system has a correspondence between predetermined drawing regulations and three-dimensional objects and a section for building a three-dimensional product model on the basis of a two-dimensional drawing, which is created under one of the predetermined drawing regulations, by reference to the correspondence. The building section can reconstruct a product model by reference to an attribute added to a view. In a preferred embodiment, the CAD system has predetermined rules each for relating a predetermined piece of information about drawings to a placement or a construction of a three-dimensional product model. When a command of placement is input and one predetermined piece of information is given, the building section arranges a two-dimensional projected figure or a two-dimensional drawn figure on a drawing in accordance with a predetermined rule by reference to information about a correspondence between the view and a corresponding three-dimensional product model to arrange the corresponding product model in three-dimensional model space in accordance with the placement of the two-dimensional projected figure.