topic Projectgeometry comand does not honor Pellipse system variable in AutoCAD Forum

Projectgeometry comand does not honor Pellipse system variable

PlesseyMathews — Mon, 27 May 2013 12:14:13 GMT

I have a set of polylines that I needed to project to a curved surface. I managed to do this successfully with the PROJECTGEOMETRY command.

The projected lines output from the PROJECTGEOMETRY command is splines and ellipses. I needed them to be polylines. Converting splines was easy but converting ellipses was a failure.

I tried to use ellipse converting lisp files from the forum. They converted the ellipses on the projected surface to 2d polylines (not 3d polylines) which changed it shape on the curved wall.

I then tried using the PROJECTGEOMETRY command after changing the PELLIPSE variable to 1 which according to the help file will create a polyline representaion of an ellipse. But it seems PROJECTGEOMETRY does not honor the PELLIPSE system variable setting.

Is there any way that the ellipse projected on the curved wall can be converted to a 3d pline? Sample file attached.

Re: Projectgeometry comand does not honor Pellipse system variable

nestly2 — Mon, 27 May 2013 12:47:10 GMT

Just an FYI, 3D polylines can not contain arc segments, so even if you did manage to convert to 3Dpoly, it would be a collecton of straight line segments.

Re: Projectgeometry comand does not honor Pellipse system variable

maxim_k — Mon, 27 May 2013 12:50:24 GMT

Hi,

In attachment you can find converted file - all projected curves are 3dpolylines.

HOW-TO:

1. Save your file as r.12 DXF

2. Open resulting DXF, delete block that represents surface

3. Insert surface from resource drawing (if you need it)

Maxim