Converts an object between being open (having free endpoints or edges) and being closed (having connected endpoints/edges).
When a curve is closed, it forms a continuous loop, with no loose ends. When a curve is open it has two ends that can be moved independently, though they might happen to occupy the same point in space.
Similarly, a surface can be closed (periodic) across U, V, or both dimensions. When a surface is open, it has free edges.
Open or close a curve
- Choose Object Edit > Close
. - Click the curve.
Open or close a surface
- Choose Object Edit > Close.
- Click a U or V isoparametric curve or edge to open or close the surface across that dimension.
Close a curve or surface by attaching its ends/edges
- Choose Object Edit > Attach > Attach
. - Click the two ends of a curve, or click opposite edges of a surface. Note:
You must have at least four spans (not counting multi-knots) between the opposite edges of the surface to attach them.
What if...?
I want to know if an object is open or closed?
- Pick the object.
- Choose Windows > Information > Information Window
. - The Geometry info section shows whether the object is open or closed.
You can also choose Object Edit > Query Edit and right-click on the object.