Synchronous and ordered environments

In a QY CAD modeling document, two environments coexist for creating sketches and model features. The two environments are synchronous and ordered. You create synchronous features in the synchronous modeling environment. You create ordered features in the ordered modeling environment. A model can contain only synchronous features, only ordered features, or a combination of both feature types.

A synchronous feature is a collection of faces that define the feature shape. There is no history retained of how a synchronous feature was created. You create features using a sketch. The sketch is no longer part of the feature definition. You modify a synchronous model by manipulating the faces that define the shape.

An ordered feature is history based. An ordered feature is driven by sketches. You can edit an ordered feature by returning to any step used in the feature creation process. You do not edit faces of an ordered feature.

For information about choosing a sketch type, see Synchronous and ordered sketches.

If you learned to use QY CAD since Synchronous Technology was introduced, you have learned to use ordered and synchronous modeling techniques together. But if you learned to use QY CAD before Synchronous Technology was introduced, you might not yet have learned to incorporate synchronous technology in your modeling.