ESRI Shape
Hi Martin,
due to the fact that i am working in the geoinformatics domain, i am working with ESRI shape files. This is the standard file format for exchanging 2D and 2.5D geospatial objects. They are seperated in at least 2 files. One is the *.shp file which holds the geometry (point or lines or polygons), each of those is bundled with a *.dbf (dBase III) file which stores the thematic attributes like name, area or whatever you want.
For my daily work I wrote a java tool which reads these shp-files and if there is a certain heigth information (absolute hight or number of floors) in the dbf file these polygons will be extruded. This allows a very fast but simple way of create 3d city-models.
Guido
P.S.: By the way, i am now working hard on learning all your modifiers and tools and wonder my self why i spent so much frustrating time with 3d max. It is a pitty that the mac is not used in our institute. Cheetah would be great for education purposes as we offer also lectures in geo-visualisation.