import shp file instead of drawing surfaces to improve the quality of the 3D model


we can improve the quality of the 3D model by drawing surfaces in the point cloud...but when we want to flattening the walls of all buildings in a city, It's very time consuming and almost impossible to draw all surfaces of all building in the city.

My question (or suggestion) is this:

Is it possible to insert all buildings and walls automatically by importing a .shp  file that has three-dimensional geometry of the city's buildings?in fact, this .shp file acts instead of many surfaces to be drawn.This .shp file is based on pre-existing drawings maps and has the same geo-referenced coordinates as the point cloud.
The goal is to provide accurate and high-quality three-dimensional model with planar surfaces without holes.


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