Method and system for indexing three-dimensional solid model data based upon modification history

摘要

The current invention discloses the method and the system for designing a three-dimensional model object with an automatic updating feature which correctly and efficiently updates the model object in response to a modification command. In order to efficiently access a part of the object data associated with the modification command, a group of parts in the model object is referred by an index. Such groups include a face set, an edge sequence and a vertex, and these elements are associated to a given modification command by the index. The association between the modification command and the elements via the index provides an efficient yet flexible access to the relevant object data and substantially eliminates the unintended effects during the updating process.