"Graphisoft are due to release GDL as a freely available language, a bit like JAVA from Sun systems. They see GDL as being a kind of Java for the 3D world. they hope that AutoDesk and others will license it as a language for 3D parametric object making."

GDL is a good way to make certain objects. For example, one can make elements like bridges, traffic furniture etc, (the benefit being that because it is parametric, the same object file can build a variety of 3D results."