Ticket #3626 - OpenSCAD import causing Multifusion failed

[egil]

I believe I have found an issue with OpenSCAD imports. I found it when working with a rather complex script, with many parameters, but I was able the to isolate the issue to this:

translate([1,0,0]) if (0) cube();
translate([2,0,0]) if (0) cube();
translate([3,0,0]) if (1) cube();

(As mentioned, the original script was more complex, with this appearing in a for loop with parameters controlling the if-sentences, but that turned out not to be important)

Importing this (or running it in the workbench) causes a "Multifusion failed" exception.

One can even simplify it to this case:

translate([1,0,0]) if (0);
translate([2,0,0]) if (0);
cube();

Same problem. If you remove the middle line, or the if (0) or the translate, it behaves all right. Pretty sure this is a bug, so I filed one: issue #3626

[keithsloan52]

First of all WELL DONE in tracking the problem down and making the effort to produce a small test scenario
from which I created the following test files.

testTrans1.scad

(102 Bytes) Downloaded 45 times

testTrans2.scad

(62 Bytes) Downloaded 40 times

I have taken a quick look at this problem and have updated the details in the bug tracker.
https://freecadweb.org/tracker/view.php?id=3626

Basically, I think that this is a regression in the Part MultiFuse function of FreeCAD 0.17.

The test files I created see bug tracker fail in FreeCAD 0.17 with Exception MultiFusion Failure.
But the same files DO NOT fail in FreeCAD 0.16.
For the versions, I was using see bug tracker

I don't think there is any related difference between importCSG.py in FreeCAD 0.16 and FreeCAD 0.17 so this points to a regression in FreeCAD 0.17 in the Part::MultiFuse function.

That is the problem is not in the OpenSCAD workbench or importCSG.py but a problem introduced in FreeCAD 0.17 to the Part Multifuse code.

The error is being generated when importCSG.py tries to execute myfuse = doc.addObject('Part::MultiFuse',name)

Might be worth trying FreeCAD 0.16 with you complicated file.

[Kunda1]

I believe I have found an issue with OpenSCAD imports. I found it when working with a rather complex script, with many parameters, but I was able the to isolate the issue to this:

Might be worth trying FreeCAD 0.16 with you complicated file.

[Kunda1]

bumped this issue to 0.19 milestone

[chennes]

This is not failing for me in:
OS: Windows 10 Version 2004
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.23971 (Git)
Build type: Debug
Branch: master
Hash: a3fb41502b079a86175e6a414d82956a48bab4e2
Python version: 3.8.6+
Qt version: 5.15.1
Coin version: 4.0.1
OCC version: 7.5.0
Locale: English/United States (en_US)