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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 ...


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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 = ...


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I think if you look into PostGIS, using the function ST_3DDWithin, you would find a useful solution.



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