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I'm a new user of QGIS 3.12.3 Bucuresti (and GIS in general).

I have loaded OS Terrain 50, overlaid with a mix of Google Satellite and OpenStreetMap which produces a 3D Map view that I am very happy with.

However, on trying to load obstructions such as masts, church spires etc. represented by columns up to the altitude (above MSL/Geoid) and protection surfaces represented by polygons in 3D space the obstructions and surfaces just appear to be draped over the surface of the terrain mapping with no elevation.

I started with obstruction data in CSV format, latitude, longitude and elevation which produced circles on the map surface. Am I missing something simple here please?

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