FreeCAD 0.16 > 0.17 regression / drawing & dxf export

[fourchette]

Hello,

I am facing a regression of FreeCAD 0.16 > 0.17
A friend of mine made a part in a 3rd party CAD software, exported as a STEP file for me to review.
I imported those STEP files (uisng FreeCAD 0.17) and with one part in particular I experienced two issues with FreeCAD 0.17
1. I cannot make a correct projection in Drawing (the outside curve is distorded)
2. The dxf export is ugly.

if i use FreeCAD 0.16 on very same file => i do not experience those bugs

i am not sure that this behavior exists in the bug list but i am not sure if it's one bug (projection) or two bugs (projection + dxf export)

how should i proceed?

thanks

[PrzemoF]

Thanks for reporting the problem. Is there a chance that you could test the same drawing on a 0.18 pre version? There is a chance that the problem was fixed since 0.17 was released.

[HarryGeier]

I had dozens of FC 0.17 DXF´s exported to CAM BAM ( Alpha 0.14 ) flawless. Can you share the design here, i could make a try with it.

[quick61]

Thanks for reporting the problem. Is there a chance that you could test the same drawing on a 0.18 pre version? There is a chance that the problem was fixed since 0.17 was released.

I just tried with -

OS: Ubuntu 18.04.2 LTS
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.16093 (Git)
Build type: Release
Branch: releases/FreeCAD-0-18
Hash: 690774c0effe4fd7b8d2b5e2fb2b8c8d145e21ce
Python version: 2.7.15rc1
Qt version: 5.9.5
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)

- and it's still there. Downloaded the attached file (freecad 17 bug.FCStd) from the OP, opened in FreeCAD version noted above, Shape 2D view, export as 2d DXF. I also exploded the shape 2D and exported the edges the same way with the same result.

Screenshot-LibreCAD.png (2.2 KiB) Viewed 1411 times

Kind of does look like there has been some regression, at least in this case...

Mark

[reox]

Same for techdraw with a very new version:

2019-03-20-204549_587x580_scrot.png (41.56 KiB) Viewed 1408 times

looks even more weird when exported as DXF:

2019-03-20-204620_443x395_scrot.png (7.2 KiB) Viewed 1408 times

Code: Select all

OS: Debian GNU/Linux buster/sid
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.16149 (Git)
Build type: Release
Branch: master
Hash: 094dda5900deb31512d7129090e06b8e150763a8
Python version: 3.7.3rc1
Qt version: 5.11.3
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: German/Austria (de_AT)

[PrzemoF]

Export to Autodesk DXF or Drawing DXF? I want to bisect the problem.

Edit: If the problem is with TechDraw as well I guess that the exporter might be OK

[openBrain]

ATM I'm not sure it can already be called a bug (even a regression) as the object is an invalid solid as told by Part->CheckGeometry

checkgeom.png (23.58 KiB) Viewed 1398 times

[quick61]

Export to Autodesk DXF or Drawing DXF? I want to bisect the problem.

That would be Autodesk DXF, as you can not export the Draft > Shape 2D in Drawing DXF. At least not on my install.

Mark

[sgrogan]

Not tested but does
Edit > Preferences > Import/Export > DXF and select "use legacy python importer"
Make a difference.

[quick61]

Not tested but does
Edit > Preferences > Import/Export > DXF and select "use legacy python importer"
Make a difference.

No, it does not, at least not for me. Ether way, in or out.

Mark