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1

To add to @Neil's answer, you also need to increase the resolution of the DEM over which the image is being draped if you want to drape over a full resolution DEM. This is controlled under Propoerties -> Base Heights ->Floating on a custom surface -> Raster Resolution. By default ArcScene will assign very course resolution so that you can see the data ...


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The raster quality is deliberately downgraded to increase display speed. See the Rendering tab of the raster layer properties in ArcScene and crank up the slider bar second bottom.


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I don't know of a way to enable Z values afterwards, but here's a workflow to create a new polyline with Z enabled and copy the existing fields and data over: 1) Create a new polyline feature class which stores Z values. 2) Import the existing fields from the old polyline feature class. 3) Right click the new polyline feature class in ArcCatalog and ...


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Create a new feature class of type "Line", and check "Coordinates include Z values", continue through the options until you get to field names. Import your original lines which didn't have Z enabled. Then, right click your new feature class, and "Load Data" from your original polyline feature class.


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You cannot create vertical plane and surfaces in ArcGIS, only 2.5D. You can however create them in an external 3-rd party application, export as 3D DXF and import and view in ArcScene.


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It all depends what data you have, if you just need to grid a surface gis is ok, if you need to interpret the subsurface you need special software...


2

You don't need a specific add-on programme, look at The Subsurface Geology of Brussels, Belgium, Is Modeled with 3D GIS with 3D Analyst. or Modeling the Terrain Below (3D Borehole tools)



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