Autodesk AUTOSKETCH 8, User Manual

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Opening and Closing Poly Entities
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To delete unnecessary vertices without changing the shape of the
selected entity
1 Select the entity you want to clean, then right-click.
2 On the pop-up menu, click Clean.
Opening and Closing Poly Entities
A polyline or curve is either open or closed (a closed polyline is a polygon).
You can open a polygon in vertex editing mode by clicking the Open button
on the edit bar. This command opens the segment you select, converting the
entity to a polyline or open curve.
You close a polyline or curve in vertex editing mode by clicking the Close
button on the edit bar. This command adds a segment connecting the
entity’s startpoint and endpoint.
TIP Opening and closing an entity using vertex editing has a similar result as
selecting the entity and changing its entity type on the edit bar. However, this
method allows you to control which segment to open.