COMPUTER DRAWING SYSTEM

摘要

A method for processing a design model generated by a computer aided desi gn system includes accessing model data that includes separately stored data documents detailing construction of the design model from a collection of components, processing the model data to generate image elements representing a projected view of t he design model and to generate tag data associating each of the image elements with a t least one of the of components and storing the first image elements and the first tag dat a in a drawing document. Supplementary data can be added to the drawing without the need fo r the external components to be available on disk or in memory. An updated drawing document can be generated following a change to one of the components. Generating an updated drawing document includes generating tag data that identifies matchings between the original and changed model components. Annotations and other supplementary data can be attached to image elements and stored in drawing documents. These annotations can be retained when the updated drawing document is produced. Methods of the invention can be implemented in software in a computer system.