[Fixed in v0.20] [CSG import] Structures get doubled when importing certain groups with offset2D

[Knochi]

Hi,

today I saw an odd behaviour with one of my models I prepared for KiCAD.

Structures containing Offset2D features and gets translated in a group with another grouped object, leave a ghost at the origin position.

I use openSCAD to create the model --> export CSG --> import in freecad --> export to .stp, .wrl using kicad stepup.

So i reduced the code to the minimum that sill produces an error:

Code: Select all

translate([0,0,10]){
    for (i=[0:3])
       translate([0,i*3,i*5]) coilShape([10,10],5,3);
    cube(10,true);
}

module coilShape(innerDims, thick, width){
    translate([0,0,-width/2]) linear_extrude(width) difference(){
      offset(thick) square(innerDims,true);
      square(innerDims,true);
    }
  }

This produces this:

view in openSCAD

FreeCadCSG_OffsetBug.png (21.3 KiB) Viewed 1070 times

And this is how it looks like in FreeCad 0.19:

view in FreeCad

FreeCadCSG_OffsetBug_FC.png (29.46 KiB) Viewed 1070 times

Version Info:
OS: Windows 10 Version 2009
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.24267 +148 (Git)
Build type: Release
Branch: Branch_0.19.4
Hash: 476ecf091941bead59b14e44afa6064d5a66afa3
Python version: 3.8.6+
Qt version: 5.15.2
Coin version: 4.0.1
OCC version: 7.5.3
Locale: German/Germany (de_DE)

[Kunda1]

Moved to open discussion subforum and x-posted to https://forum.freecadweb.org/viewtopic. ... 16#p588416

[Kunda1]

pinged by pinger macro

pinged by pinger macro

[keithsloan52]

Not seeing the problem with the Alternate Importer https://github.com/KeithSloan/OpenSCAD_Alt_Import

Image 24-04-2022 at 18.15.jpg (189.33 KiB) Viewed 712 times

But head full of COVID so maybe.

[chennes]

It's working fine in 0.20 as well, so one of the many changes we made in this development cycle has fixed the issue.

67836_fixed.png (34.04 KiB) Viewed 620 times