Patent ID: 6629065
Filing Date: 2003-09-30
Classification: G06F,G06T

Abstract:
A method of constructing a geometric model in a CAD system wherein time is measured in serial time steps, the geometric model being formed from two or more geometric elements in attached relationship, the method comprising:a. in a first time step, 1. attaching a subject geometric element to one or more prior geometric elements already within the geometric model, the subject geometric element and the prior geometric elements to which it is attached thereby being in a parent-child relationship wherein (1) the subject geometric element constitutes a child element, and (2) the prior geometric elements to which it is attached constitute parent elements; 2. outputting the geometric model after the subject geometric element is attached; b. in a later time step, (1) modifying the subject geometric element by moving or resizing it within the geometric model; (2) computing the boundary of the modified subject geometric element and any geometric elements constituting child elements with respect to the subject geometric element, without computing the boundary of any geometric elements constituting parent elements with respect to the subject geometric element; and (3) outputting the geometric model after the subject geometric element is modified.