The Concatenate/Reapproximate Curves option merges two or more existing curves into one new curve. The original curve is deleted. Curves can be merged with the following options:
Reapproximate Curve
Redefines the curve based on a locally set triangulation tolerance instead of the global tolerance. Used to create a smoother curve definition.
Concatenate Curve
Joins the curves selected that are separated by a gap less than the given tolerance limit.
2D Hull
Creates a convex 2D hull around the selected curves. The curves are connected into a faceted curve that does not follow any concave shapes.
Tolerance
The curve approximation tolerance.
Max shrink
The relative shrink wrap tolerance. The value entered should be between 0 and 1. A typical value is 0.2.
Four curves
This option splits the concatenated faceted curve into four edges so that a surface can be created from them.