New answers tagged modelling
There is a Google SketchUp to ArcGIS tutorial available on YouTube which may help you do this in ArcScene if using ArcGlobe is not a mandatory requirement.
You can import the models from sketch up or a cad file that is designed in 3d. The key for models in ArcGIS is multi patch. If going from sketchup export to kml. What you're after is the colada (.dae) file. A kml can be renamed to .zip and you will find the dae inside. If importing from cad just make sure the file has 3d units, and dwg will work fine. ArcGIS ...
You could try using a PostGIS database with topology data type and functions. QGIS also has some topology functionality built in - this could be used if you're looking to have a desktop front end to your platform.
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