View Issue Details
|ID||Project||Category||View Status||Date Submitted||Last Update|
|0002508||Part||[FreeCAD] Bug||public||2016-04-15 12:37||2018-01-30 16:59|
|Platform||PC Intel Xeon E3 1220 V3 @3.1GHz||OS||Windows10 Pro 64bit||OS Version||10.0.10586|
|Product Version||[FreeCAD] 0.15|
|Target Version||[FreeCAD] 0.18||Fixed in Version|
|Summary||0002508: Lofting edges get swapped over|
|Description||I was trying to create a handle using the lofting command. I created the frames for the loft and every time I try and use the loft command either 1 or 2 edges get swapped over. See attached file. I get the same behaviour in the newly released Version 0.16.|
This has been discussed on the Forum. See:-
|Steps To Reproduce||Just try lofting between the frames in the attached drawing. Fails every time, which is good in a way !|
|Tags||No tags attached.|
Loft_6.FCStd (20,143 bytes)
Still an issue in master.
OS: Ubuntu 14.04.5 LTS
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.9822 (Git)
Build type: None
Python version: 2.7.6
Qt version: 4.8.6
Coin version: 4.0.0a
OCC version: 6.8.0.oce-0.17
Adding screenshot from forum thread
IMG_0041.JPG (24,420 bytes)
IMG_0041.JPG (24,420 bytes)
Checking if I can trigger myself, so that I have an unread email in my account. I can not "unread" forum posts and now I am at two other issues simultaneously.
Ref ticket:issue #2508
Is this a PDN blocker?
This isn't a bug, not even an issue. The documentation states
[quote]This means that if one is doing a loft between two squares, the maximum twist possible is <45°.[/quote]F2 is twisted 45° so the twist of the loft is expected.
[quote=abdullah]Is this a PDN blocker?[/quote]
It cannot be a PDN blocker since this bug was wrongly reported to PartDesign instead of Part. This is about the Part Loft tool, but admittedly it may affect the PDN additive/subtractive loft feature as well.
[quote=chrisb]This isn't a bug, not even an issue. The documentation states[/quote]
@all the link to the page that mentions it: https://www.freecadweb.org/wiki/Part_Loft_Technical_Details (@DeepSOIC wrote that page)
Should this be indicated as an upstream OCC issue then?
It is misquoted that I asked whether it is a PDN blocker. I just pasted the text from an email where I was asked whether it is a PDN blocker.
That clarified. It is as a PDN blocker as it is a Part blocker, i.e. the same issue happens in PDN.
DeepSOIC did a great job explaining what is under the hood when creating a Loft.
It is not uncommon to get lack of correspondence of the profiles (which honestly it is not the best explanation ever in a pop up). It is not uncommon to have a flipped profile path like above.
I am not sure that profile is overtwisted (as per documentation). I would tend to think that if the one half of the arc was possible, the other half should be possible as well.
What I understand from the documentation is that if the twist would me more than 45º, the selection of correspondance would change so as to minimize the twist.
We best ask the master (ping @DeepSOIC), but I would tend to think that it is a bug and I am not so sure it is on the OCC side (I am somewhere 50-50 it is our bug). However, I did not try to fix it. Though I might try if I keep having this kind of awful flipping in my designs (it gets even worse with a subtractive loft feature, the poor thing does not know what to remove and what to leave)...
||sorry guys, I don't have an answer, and I don't want to dive into this problem at the moment.|
|2016-04-15 12:37||PaulC||New Issue|
|2016-04-15 12:37||PaulC||File Added: Loft_6.FCStd|
|2017-01-27 14:35||Kunda1||Note Added: 0008027|
|2017-01-27 14:35||Kunda1||Status||new => feedback|
|2017-01-28 18:23||normandc||Note Added: 0008061|
|2017-01-31 13:31||Kunda1||Status||feedback => confirmed|
|2017-04-28 16:32||Kunda1||Target Version||=> 0.17|
|2017-06-03 15:51||Kunda1||File Added: IMG_0041.JPG|
|2017-06-03 15:51||Kunda1||Note Added: 0009278|
|2017-06-04 05:47||abdullah||Note Added: 0009280|
|2017-06-07 16:05||chrisb||Note Added: 0009306|
|2017-06-17 21:30||normandc||Note Added: 0009424|
|2017-06-17 21:30||normandc||Project||PartDesign => Part|
|2017-06-17 21:30||normandc||Category||Bug => General|
|2017-06-17 23:47||normandc||Category||General => Bug|
|2017-06-19 21:53||abdullah||Note Added: 0009460|
|2017-10-18 11:08||Kunda1||Note Added: 0010314|
|2017-10-18 11:39||DeepSOIC||Note Added: 0010315|
|2018-01-30 16:59||wmayer||Target Version||0.17 => 0.18|