We can consider Shapes to be “closed’ or “open.” Of course, any open shape can be closed and any closed shape set to open, but some shapes lend themselves to one or the other. For example, a gear shape, would normally be closed while a molding profile would normally be open.

Closed Shapes

 

Primitives

 

 

 

 

 

Plans

 

 

 

 

 

Sections

 

Open Shapes

Column Profiles the are Lathed

 

Wall Sections the are PlanSwept

 

Moldings that are PlanSwept