New answers tagged topology
iTopologyExtension interface is part of the ESRI.ArcGIS.EditorExt namespace, so you need to import this namespace at the top of your module (and also check it is added to references): Import ESRI.ArcGIS.EditorExt Or if you don't want to import, just reference iTopologyExtension in full: Dim pTopoExt As ESRI.ArcGIS.EditorExt.ITopologyExtension I think ...
With ArcGIS, I suppose you have to use 3D Analyst but you have also free solutions: Postgis, as ikes says GRASS GIS which is a true 3D GIS (look at Visualization and volumetric 3D examples ) gvSIG can also manipulate 3D geometries and Python modules as Shapely from shapely.geometry import LineString line1 = ...
I think if you look into PostGIS, using the function ST_3DDWithin, you would find a useful solution.
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