Anyone willing to help me get a DXF from InkScape into OpenSCAD,
probably offline from the group?

I took a bit mapped image and used InkScape to create an outline of a lake.

Problem 1: the outline is made of about 12 separate "curves" rather than
1.  When I try to Union, extra lines go all over the place (the Union is
not "smart").

Problem 2: I went to make some minor edits to simplify the shape; and

Problem 3: OpenSCAD keeps telling me that it does not know what a Spline is.

I tried using this approach but failed:

https://repraprip.blogspot.com/2011/05/inkscape-to-openscad-dxf-tutorial.html

I rarely use InkScape at all, so most of this is probably rookie errors

Thanks

Jon

Inkscape to openscad extension.
https://www.thingiverse.com/thing:1065500

The problem is that SPLINE entity in the DXF file is a proprietary AutoCAD
entity.  Only the control points and some other points used by AutoCAD to
define the SPLINE, are listed in the DXF file.  In AutoCAD (at least in the
old version I am using) you cannot "EXPLODE" a SPLINE entity into line and
arc segments, which OpenSCAD understands.  The best you can do with the DXF
file is to edit it and make a list of the control points.  If you look at
the DXF file you will find a series of numbers something like this:
11
239.6191742034261
21
687.9629630664632
31
0.0
11
400.8514297862043
21
778.7037046965735
31
0.0
The number after the "11" is an X coordinate and the number after the "21"
is a Y coordinate of a control point that was used to create the spline.

In the picture below the blue line is the SPLINE and the red lines connect
the control points.
If you can post a link to the DXF file I will see if I can convert it into a
series of short line segments or an AutoCAD POLYLINE, which OpenSCAD can
use.
http://forum.openscad.org/file/t1309/spline.jpg

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