Rob-GB Posted March 17, 2009 Share Posted March 17, 2009 Hi hope someone can help. On Autocad 2008, I am trying to extrude a window section but am unable to convert the partial elipse moulding to a polyline to enable its extrusion. As I am currently short of work I thought I would use my time to try and get to grips with 3D, normally only have to use 2D for work, though I aspire to the great examples of 3D seen on here. Thanks for any help. Rob. Quote Link to comment Share on other sites More sharing options...
ReMark Posted March 17, 2009 Share Posted March 17, 2009 The variable PELLIPSE should be set to "1". It is probably set at "0" (the deafult). This setting creates a true ellipse object. A setting of "1" creates a polyline representation of an ellipse. Quote Link to comment Share on other sites More sharing options...
Rob-GB Posted March 17, 2009 Author Share Posted March 17, 2009 Thanks ReMark. I will have a go with that, I tend to leave everything on default settings and until now it has been okay. 3D has some quirks of its own doesn't it? Regards Rob. Quote Link to comment Share on other sites More sharing options...
MaxwellEdison Posted March 17, 2009 Share Posted March 17, 2009 You could also convert the linework to a region with the BOUNDARY command, it's very helpful for turning quick sketches into closed geometries for 3D work. Quote Link to comment Share on other sites More sharing options...
JD Mather Posted March 17, 2009 Share Posted March 17, 2009 Presspull will work on a true ellipse an closed area formed by part of an ellipse and does not require a closed polyline or Region entity. In fact Presspull can be used to "extrude" an area with a boundary comprised of a mix of arcs, polylines, lines, and splines. See the tutorials in my signature. Quote Link to comment Share on other sites More sharing options...
fuccaro Posted March 17, 2009 Share Posted March 17, 2009 Rob For your new ellipses use the PELLIPSE sysvar as Remark pointed. There is a routine I wrote years ago, that helped a lot of people to make their next step to 3D based on the old 2D drawings. Here: http://www.cadtutor.net/forum/showthread.php?t=1639 Quote Link to comment Share on other sites More sharing options...
Rob-GB Posted March 18, 2009 Author Share Posted March 18, 2009 Thanks for all the replies. Had another go at the drawing and sorted all the timber sections into polylines. It will make the task much easier now . fuccaro great lisp routine, I read the whole thread. Don't know why it did not show up when I ran a search for ellipse threads before posting? Rob. Quote Link to comment Share on other sites More sharing options...
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