Hi Helge, Technically you could obtain a mesh (or meshes) of only the buildings semi-automatically if you have a shapefile with the building footprints, which is generally available information for cities, using a classification process like shown in the video: https://www.youtube.com/watch?v=spo-xHavSN0 You may need to change the 'export resolution' setting to obtain meshes with more or less triangles after export. Indeed you can also extract the ground with the Descartes ground extraction tool. Regards, Elenie
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