The Filled Region tool creates a 2-dimensional, view-specific graphic with a boundary line style and fill pattern within the closed boundary. The tool is useful for defining a filled area in a detail view or for adding a filled region to an annotation family.
The filled region is parallel to the view’s sketch plane.
A filled region contains a fill pattern. Fill patterns are of 2 types: Drafting or Model. Drafting fill patterns are based on the scale of the view. Model fill patterns are based on the actual dimensions in the building model.
A filled region created for a detail view is part of the Detail Items category. Revit lists the region in the Project Browser under Families
Detail ItemsFilled Region. If you create a filled region as part of an annotation family, Revit identifies it as a Filled Region, but does not store it in the Project Browser.