A free edge is an edge that is owned by only one surface.

Free edges are colored red by default.

On a clean model consisting of surfaces, free edges appear only along the outer perimeter of the part and around any interior holes.  Free edges that appear between two adjacent surfaces indicate the existence of a gap between the two surfaces.  The automesher will leave a gap in the mesh wherever there is a gap between two surfaces.

 

See Also:

Surfaces

Geometry Terminology