ppolvado Posted July 21, 2009 Posted July 21, 2009 I am building a dxf file and importing the file into SEW DXF/DWG Viewer version 1.23. When I put in an ellipse, I can't get the view to draw it. I have taken a file that someone else wrote and it still doesn't display. Is there another viewer that I can use to see ellipses? I have read that many versions do not pull up the ellipses. I have been able to do arcs, circles and lines but cannot do ellipses. Any suggestions. Quote
GE13579 Posted July 21, 2009 Posted July 21, 2009 Have you tried DWG Trueview? (Free download from Autodesk) I can't emulate the issue as I'm at home. Quote
AlinOz Posted July 24, 2009 Posted July 24, 2009 Perhaps it is related to the way the ellipse is constructed. Using the PELLIPSE variable (default = 0) you can develop the ellipse as a true ellipse (Spline = 0) or Polyline (= 1). There may be an issue with a number of viewers that may not be able to 'see/ recognize' splines and ellipses. Whilst the Polyline version is the old tardy way to do it and really only an old form of constructed Polyline, it can be more ediatble and can be seen by any viewer. One major downside to it though is that you can't find the centre or the Quadrants like you can with the 'true' ellipse - you can project these though... I know that's probably not the answer, but it may be food for thought Quote
ppolvado Posted July 27, 2009 Author Posted July 27, 2009 I have downloaded the DWG Trueview and tried it. It gives me an error "Undefined group code 10 for object on line 1582. Invalid or incomplete DXF input -- drawing discarded." This doesn't make sense to me - the group code 10 is the x value of the centerpoint and that's consistent with all other things I've draws such as a circle and arc both of which work fine in this dwg trueview. I don't know how to use the PELLIPSE variable and I can't find any examples - can anyone show me an examle??? Quote
lpseifert Posted July 27, 2009 Posted July 27, 2009 The Pellipse (=1) variable will create a polyline instead of an Ellipse entity when using the Ellipse command. Quote
ppolvado Posted July 27, 2009 Author Posted July 27, 2009 Do I put this in the header section with Pellipse as the group code and 1 as the data element that follows? Quote
AlinOz Posted July 27, 2009 Posted July 27, 2009 Do I put this in the header section with Pellipse as the group code and 1 as the data element that follows? Basically, that won't make any difference whatsoever. As previously pointed out, the PELLIPSE variable adjusts the internal AutoCAD function to draw the ellipse as either a 'true splined' ellipse or as Polylines put together to closely represent an ellipse. I have attached the section of a 2004 format DXF that has 2 ellipses - 1 is generated by using a 'true' ellipse and one by the Polyline generated version. All headers and other unneccessary information have been deleted to simplify what you're looking at. For your ellipse to work using the Polyline version, you would somehow need to generate the algorythm to draw the ellipse as a Polyline (good luck there) just as AutoCAD does. Perhaps your answer lies somewhere in the Ellipse section - I'm no guru on DXF, but hopefully you may pick something up in there that your DXF coding is missing... Good Luck... Ellipse Test.dxf Quote
kto2t Posted October 29, 2010 Posted October 29, 2010 same problem cannot open dxf with an ellipse inside true view 2011 Quote
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