Markus Barrera-Kolb Posted July 9, 2008 Share Posted July 9, 2008 For 2D drafting, what are the salient differences between polylines and polygons? I take it that polygons can't have curved line segments, and polylines don't seemt to have the "Closed" check-box in their OIP, but other than that, is there some magical difference? Quote Link to comment
Benson Shaw Posted July 9, 2008 Share Posted July 9, 2008 Mathematically, I do not know the diff. You hit the main practical bits about the curve and open edge options of the polyline. There are some functions which require a polygon. One example is that the site model DTM hull/boundary can be defined by a polygon, but not a polyline. A polyline can be opened/closed by using the Show/Hide Edge mode of the 2d reshape tool or by advancing through the vertices with the OIP A polyline can be converted to a polygon via the Modify/Convert command. A polyline has the disadvantage, for some intents, of appearing closed when it is actually open. eg the extrude of an open poly does not have filled "top" or bottom. (ya gotta drag/undo each corner vertex until you find the open one - usually where you started). A polyline can be smoothed or have its vertex count/spacing modified via commands and scripts. Many spell checkers think polyline is a misspelled word. Enough of my musings. -B Quote Link to comment
islandmon Posted July 9, 2008 Share Posted July 9, 2008 Polyline is also a 'vector path' which other objects and procedures like animation and ExtrudeAlongPath can follow. Quote Link to comment
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