Rooster Posted November 14, 2008 Share Posted November 14, 2008 Firstly, what's the difference between a bog-standard polyline and a 2D polyline? And secondly, why can't I snap to a 2D polyline? It's driving me nuts.... EDIT: I've noticed that it's not all 2D polylines that I can't snap to. I have others in the same layer, with the same properties which are fine...... ???????? Quote Link to comment Share on other sites More sharing options...
ReMark Posted November 14, 2008 Share Posted November 14, 2008 Quoted from CAD Panacea: Confused about the various polyline types that you see in AutoCAD? From the end user perspective there are 3 polyline types listed in the PROPERTIES command, even though there are only two "entity" types. polyline - this is an LWPOLYLINE entity, always 2D. 2d polyline - this is a POLYLINE entity, also 2D. 3d polyline - this is a POLYLINE entity, usually 3D, with each vertex at a different elevation. It is possible to have a "3d polyline" and have each vertex at the same elevation. If you use the LIST command on any polyline, you will only see the entity names (POLYLINE or LWPOLYLINE). POLYLINE entities are the original type. LWPOLYLINE entities were introduced in R14. If PLINETYPE = 0 (zero), then the PLINE command will create POLYLINE entities. If PLINETYPE = 1 or 2, then the PLINE command will create LWPOLYLINE entities. To create 3d polylines, use the 3DPOLY command. To convert between POLYLINE and LWPOLYLINE entities, use the CONVERTPOLY command. Quote Link to comment Share on other sites More sharing options...
Rooster Posted November 14, 2008 Author Share Posted November 14, 2008 Thanks very muc ReMark Quote Link to comment Share on other sites More sharing options...
ReMark Posted November 14, 2008 Share Posted November 14, 2008 3DPoly - Definition taken from AutoCAD Help: "A 3D polyline is a connected sequence of straight line segments created as a single object. 3D polylines can be non-coplanar; however, they cannot include arc segments." Quote Link to comment Share on other sites More sharing options...
ReMark Posted November 14, 2008 Share Posted November 14, 2008 I'm not sure why you are having trouble snapping to some 2D polylines. Might it have something to do with the UCS orientation at the time of their construction versus its current orientation? Quote Link to comment Share on other sites More sharing options...
Ritch7 Posted November 14, 2008 Share Posted November 14, 2008 you should be able to use snap on 2D poly's, like Terminator said it must be your settings or something you have alterd somewhere along the line Quote Link to comment Share on other sites More sharing options...
Danse_Macabre Posted August 12, 2009 Share Posted August 12, 2009 I don't mean to bring back an old thread...but just wondering if you ever figured out why you couldn't snap to 2D polylines? I am having the same problem right now and I am getting very frustrated with it. Quote Link to comment Share on other sites More sharing options...
ReMark Posted August 12, 2009 Share Posted August 12, 2009 DM: Are you working in 2D or 3D? Quote Link to comment Share on other sites More sharing options...
Danse_Macabre Posted August 12, 2009 Share Posted August 12, 2009 Well, it should be mostly 2D, however some of the Civil3D objects are drawn at their respective z value (such as spot elevations). All the line work should be 2D though, which is what I am wanting to snap to. Quote Link to comment Share on other sites More sharing options...
ReMark Posted August 12, 2009 Share Posted August 12, 2009 When did the problem first occur? Quote Link to comment Share on other sites More sharing options...
Danse_Macabre Posted August 12, 2009 Share Posted August 12, 2009 I have never really noticed it before, but usually the lines are just regular 'polylines' as opposed to '2D polylines'. If I explode the '2D polyline' into lines I can snap to endpoints (or anything) like normal. Just so I am clear on this...I should be able to snap to these '2D poylines' right? If so, maybe I should just try to restart AutoCAD and see what happens. Quote Link to comment Share on other sites More sharing options...
Danse_Macabre Posted August 12, 2009 Share Posted August 12, 2009 Well, restarting AutoCAD and my computer (thanks to Microsoft Automatic updates) did not rectify the problem. Maybe I will just have to live with exploding them and converting to regular polylines. Quote Link to comment Share on other sites More sharing options...
chelsea1307 Posted August 12, 2009 Share Posted August 12, 2009 To convert between POLYLINE and LWPOLYLINE entities, use the CONVERTPOLY command. you dont have to explode, try this as remark posted earlier Quote Link to comment Share on other sites More sharing options...
Danse_Macabre Posted August 13, 2009 Share Posted August 13, 2009 ahh yes...much better option to exploding, thanks for bringing that back up. Quote Link to comment Share on other sites More sharing options...
ADSK2007 Posted June 1, 2021 Share Posted June 1, 2021 You maybe are using some lisp that is changing your settings. This is happening with Polyline when "Polylinetype" is set wrong. Type "Polylinetype" then set the value to 1. Now you can snap to it, no need to explode or use "convertpoly" every time you draw Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.