History-based parametric exchange - the macro-parametric approach

Abstract

Because AP203 of STEP exchanges B-rep of a CAD model, the receiving party cannot modify the model parametrically. This is because the parametric information is not translated and lost. To solve this problem the Parametrics Group of ISO STEP committee is working on the history-based parametrics. The sequence of modeling commnads is translated instead in the macro-parametric approach and the model is re-generated in the receiving CAD system. The journal file, commands sequence file, script file, or macro file is obtained from a commercial CAD system. KAIST is implementing and testing the idea with simple parts.