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    $\begingroup$ What I want to do is to extract a clean 2D mesh. $\endgroup$ Commented Nov 1, 2018 at 13:01
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    $\begingroup$ You could then import the SVG file. It's at least worth trying and comparing the results to other approaches. $\endgroup$ Commented Nov 1, 2018 at 16:05
  • $\begingroup$ theres the non blender way, it may apply. render your image shadeles with alpha background inkskape [ inkscape.org/es/release/0.92.3 ] inkskape have a function to convert bitmaps to svg curves check this: [youtube.com/watch?v=kMewvFYPOdM] then import it back as inkscape saves svg files. $\endgroup$ Commented Nov 2, 2018 at 4:20
  • $\begingroup$ I think this is a very clean approach.. getting Freestyle to do all the work.. and you can tune it by adjusting segment lengths, simplifying curvature, using all the modifiers available - all within Blender. $\endgroup$ Commented Nov 3, 2018 at 1:25
  • $\begingroup$ if you dont need it explicitelly as an svg curve. why not to try the boolean modifier to extract a section of your mesh. Use a plane to get the intersection section you want. look at this may be this is what you need youtube.com/watch?v=gEudXbZQzIA $\endgroup$ Commented Nov 4, 2018 at 2:40