Further Resources on GDL Object Creation
Books and documentation are available on GDL and object library development.
•See the GDL Center, Graphisoft’s GDL knowledge base, at gdl.graphisoft.com.
•The GDL Reference Guide will help you learn to apply the powerful Geometric Description Language for dressing up your project with objects, ornaments and other details of your own design.
See its PDF version in the Help > Online Resources menu.