You might want to visualise a change to existing buildings in a city or prepare the ground for a large infrastructure project. CityPlanner has tools that lets you hide existing buildings in the dataset and modify the terrain model.
Hide buildings in a 3D city model dataset with a click
Draw a polygon and set a height to flatten the terrain
Use shape files with polygons and attributes to create terrain modifications automatically
Add the modifications to a layer to show before/after scenarios
