AutoCAD 2007/2008/2009

AutoCAD 2007/2008/2009

Reply
Distinguished Contributor
106 Posts
2 Kudos
Registered: ‎04-03-2004
Post 1 of 5

Self-intersecting curve?

3111 Views, 4 Replies
03-03-2009 10:15 AM
I'm using AutoCAD Architecture 2009 and Windows XP Professional. I have a closed polyline containing some straight segments and some arcs. I want to extrude this into a 3D solid but I'm told I cannot extrude or sweep a self-intersecting curve. I guess I know what one is but I don't know how to work around the restriction. Any ideas?

Re: Self-intersecting curve?

03-03-2009 10:35 AM in reply to: johnmacfall

 


style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
Highlight your pline.  Zoom in looking at all grips and youll find
one that is 'intersecting itself'.  Simply adjust the grips and your
good.
*Bill Gilliss
Post 3 of 5

Re: Self-intersecting curve?

03-03-2009 10:36 AM in reply to: johnmacfall
johnmacfall@cs.com wrote:
> I'm using AutoCAD Architecture 2009 and Windows XP Professional. I
> have a closed polyline containing some straight segments and some
> arcs. I want to extrude this into a 3D solid but I'm told I cannot
> extrude or sweep a self-intersecting curve. I guess I know what one is
> but I don't know how to work around the restriction. Any ideas?

Use the BOUNDARY command to create a new polyline inside the old. The
new one will ignore the odd vertex location or segment overlap that is
not letting you extrude.

If your polyline does cross itself, like a figure 8, use BOUNDARY inside
each loop and then union the two pieces after you extrude them.

-Bill
Distinguished Contributor
106 Posts
2 Kudos
Registered: ‎04-03-2004
Post 4 of 5

Re: Self-intersecting curve?

03-03-2009 01:04 PM in reply to: johnmacfall
You're right. I found flaws that I hadn't seen. Thanks.
Distinguished Contributor
106 Posts
2 Kudos
Registered: ‎04-03-2004
Post 5 of 5

Re: Self-intersecting curve?

03-03-2009 01:05 PM in reply to: johnmacfall
Zounds! A nice, simple workaround for my sloppy ways. Thank you.
Post to the Community

Have questions about Autodesk products? Ask the community.

New Post
Announcements
Are you interested in helping shape the future of the Autodesk Community? To participate in this brief usability study, please click here. Your time and input is greatly appreciated!