[postgis-users] Experience with GDL objects

[Mireles Ricardo]

I am seeking to understand the relationship between GIS technologies (namely PostGIS) and GDL objects.

Recently I saw a presentation of web-delivered 3D modeling of buildings using GDL objects. 

GDL stands for Geometric Description Language, and comes out of the GraphiSoft ArchiCAD world (see http://www.gdlalliance.com/Parametric/GDL.html ).

With the right set-up (browser, plug-ins, etc.) a web-page with GDL objects looks alot like TerrainServer, or ArcView 3D Analyst. 

Here is some static examples (screenshots):
http://onuma.com/VRIS/Objects/Schools.html

It seems like GDL, is an "open" standard, but I'm not sure. 

What other technologies/stratregies are similar?
Has anyone here seen GDL tied into GIS/PostGIS somewhere?