Extent
Defines the area of the production.
The extent defines a clipping region for the production.
By default, the production extent covers the whole region-of-interest of the reconstruction.
The extent can be defined roughly by editing production bounds.
An extruded polygon can be used to define the area more precisely from a DGN or from a KML file (if the reconstruction is georeferenced). Click on the button Import from polygon to specify the region of interest from a KML or a DGN file. The polygon file only defines a 2D polygon: top and bottom height can be defined from the interface.
For mesh productions using a tiling, you can limit the production to a subset of tiles. By default, ContextCapture will select all the tiles necessary to cover the given extent.