I'm new to 3D data and want to know what I should be searching for when I'm looking to find all the triangles in a 3D building mesh that fall within a 2D footprint.
The mesh comes from LiDAR and broken into 1km grids, the largest tile contains some 60m triangles there are 1,000 tiles to process. I'm familiar with Python/QGIS/PostGIS and this seems like a problem others must have faced but I'm not getting any leads so think I'm not looking for the right terms where I've looked for
3D spatial joins in QGIS and
generating 3D bounding box in QGIS from 2D polygon