SVG to sketch?

[robofly]

Hi,
I'm modeling an RC plane fuselage. I'd like to blend airfoil shape into the fuselage. The airfoil is an SVG image. I already succeeded doing this by subtracting shapes with boolean operation, but I'd like to know if it's possible to transfer vertices from SVG into a sketch, so I could have more control?
Files attached.

What I'm trying to achieve

body-with-airfoil-shape.png (59.27 KiB) Viewed 3306 times

OS: Linux Mint 18.1 Serena
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.16.6707 (Git)
Build type: None
Branch: releases/FreeCAD-0-16
Hash: 5465bc47c95db45e0be85dc0e2872419efadce0f
Python version: 2.7.12
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 6.8.0.oce-0.17

[chrisb]

In Draft Workbench you have Menu->Draft->Draft to Sketch. However this cannot deal yet with Sketcher's new B-Splines. I have written a macro which approximates the splines with circular arcs: https://forum.freecadweb.org/viewtopic. ... 71#p162571

[microelly2]

This creates some outer curves

p=App.ActiveDocument.path10

pts=[v.Point for v in p.Shape.Vertexes]
w=Draft.makeWire(pts)
Draft.makeSketch(w,autoconstraints=True)

bc=Part.BSplineCurve()
bc.interpolate(pts)
pk=App.ActiveDocument.addObject("Part::Spline","path10spline")
pk.Shape=bc.toShape()

The path10spline object you can convert to a sketcher bspline with this script:
https://github.com/microelly2/freecad-n ... hspline.py

It's still not optimized but it is a sketch

[NormandC]

The path10spline object you can convert to a sketcher bspline with this script

↓
↓
↓

Version: 0.16.6707 (Git)
^^^^^^^^^^^^^^^^^^^^

[robofly]

Thanks a lot microelly2, I got it working (had to install some python dependencies first)!

I have another question. The script creates a new sketch from SVG, is it possible to copy/paste objects from one sketch to another?

[NormandC]

Thanks a lot microelly2, I got it working

How? BSplines are not available in 0.16.6707 which is the version you're using, they're being developed in 0.17 which is nowhere near ready to be released.

That was the point I was trying to make to microelly2 in my previous reply: he should have mentioned it...

is it possible to copy/paste objects from one sketch to another?

It's not. But you can merge sketches into a single one, then you can delete the geometry you don't want. The Merge sketches utility is in the Part Design or Sketch menu.

[robofly]

How? BSplines are not available in 0.16.6707 which is the version you're using, they're being developed in 0.17 which is nowhere near ready to be released.

I'm not exactly sure how Being a cad n00b I did a lot of clicking and lost track, but I have a sketch generated from SVG.
Take a look at the file, maybe you can figure it out. And thanks for the merging tip.

[NormandC]

Your last sketch does not contain curves, but small straight lines.

[chrisb]

The Macro I gave needs 0.17 as well (sorry, I forgot because I developed it some time ago), due to the fact that it uses stuff from the Path Workbench. However it might well work with 0.16 too if you integrate parts of Path Workbench's python code in PathUtils.py.
I'm not going to do it myself, because I guess that the conversion to Sketcher splines will come in the near future. The use of (circular) arcs only is still sensible if it comes to the generation of GCode for mill and lathe driving.