{Solved} - Mirror sketch and Sketcher Symmetry Problem/Question

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Palmtree
Posts: 104
Joined: Wed Apr 08, 2020 5:06 am

{Solved} - Mirror sketch and Sketcher Symmetry Problem/Question

Post by Palmtree »

Problem 1- Mirror sketch:
I have attached a test file (Test Sheetig Profile.FCStd)
Open file ==> Highlight all (Before entering edit sketch) ==> Sketcher Mirror ==> Y-Axis (Image 1) ==> Wrong/Strange result (image 2)

Problem 2- Sketcher Symmetry:
Click to enter Edit Sketch ==> Sketcher Symmetry (Image 3) ==> Wrong/Strange result (image 4)

Am I missing something? Please confirm this problem? any comment?

************************************
************************************

Code: Select all

OS: Windows 10 Version 2009
Word size of FreeCAD: 64-bit
Version: 0.21.30305 (Git)
Build type: Release
Branch: master
Hash: 5ffc2e10b69971e2cdcd798c4deacf44d407fd77
Python 3.10.6, Qt 5.15.4, Coin 4.0.0, Vtk 9.1.0, OCC 7.6.2
Locale: English/Australia (en_AU)
Installed mods: 
  * Behave-Dark-Colors 0.1.1
  * BIM 2021.12.0
  * Design456 0.0.1
  * dodo
  * Dracula 0.0.2
  * fasteners 0.4.3
  * Help 1.0.3
  * Parts_library
  * PieMenu
  * ProDarkThemePreferencePack 1.0.0
  * Reinforcement
  * SketchArch
Attachments
Test Sheeting Profile.FCStd
(478.03 KiB) Downloaded 31 times
Image 1.jpg
Image 1.jpg (268.44 KiB) Viewed 890 times
Image 2.jpg
Image 2.jpg (246.95 KiB) Viewed 890 times
Image 3.jpg
Image 3.jpg (321.97 KiB) Viewed 890 times
Image 4.jpg
Image 4.jpg (256.65 KiB) Viewed 890 times
Last edited by Palmtree on Sat Oct 01, 2022 8:05 am, edited 1 time in total.
User avatar
Palmtree
Posts: 104
Joined: Wed Apr 08, 2020 5:06 am

Re: Mirror sketch and Sketcher Symmetry Problem/Question

Post by Palmtree »

Palmtree wrote: Fri Sep 16, 2022 5:27 am Problem 1- Mirror sketch:
Problem 2- Sketcher Symmetry:
I have been looking for a work around and I have found one I would like to share.

Download the file from the post before (Test Sheeting Profile.FCStd) ====>
Select Sketch001 (Image 1) => Downgrade => Upgrade => Wire => Select Wire => Converts Draft to Sketch => Select Sketch => go to sketch WB (Before entering edit sketch) => Sketcher Mirror ==> Y-Axis ==> Done ==> Mirror sketch OK (Image 2)

Similarly no problem for Sketcher Symmetry (copies the profile symmetrical to a chosen line – Image 2)

I am confused :? :? :? . Is this a bug? :?: :?: :?: I wish if some body can confirm my reported Problem/Question :) :) :)

**********************************
**********************************

Code: Select all

OS: Windows 10 Version 2009
Word size of FreeCAD: 64-bit
Version: 0.21.30454 (Git)
Build type: Release
Branch: master
Hash: 5df954690787dedbbf3c35f658f010f388474676
Python 3.10.6, Qt 5.15.4, Coin 4.0.0, Vtk 9.1.0, OCC 7.6.3
Locale: English/Australia (en_AU)
Installed mods: 
  * Behave-Dark-Colors 0.1.1
  * BIM 2021.12.0
  * Design456 0.0.1
  * dodo
  * Dracula 0.0.2
  * fasteners 0.4.10
  * Help 1.0.3
  * Parts_library
  * PieMenu
  * ProDarkThemePreferencePack 1.0.0
  * Reinforcement
  * SketchArch
Attachments
Image 1.jpg
Image 1.jpg (258.39 KiB) Viewed 672 times
Image 2.jpg
Image 2.jpg (347.08 KiB) Viewed 672 times
Image 3.jpg
Image 3.jpg (322.08 KiB) Viewed 672 times
Bance
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Posts: 4186
Joined: Wed Feb 11, 2015 3:00 pm
Location: London

Re: Mirror sketch and Sketcher Symmetry Problem/Question

Post by Bance »

This is not a bug, the sketcher solver accepts the first solution to the possible constraints. It does not mean that it is the only solution.

In some cases there are more than one possible outcome. When this happens the vernacular description is 'Flipping'.

A different set of constraints may solve the problem.

This one of the reasons it is recommended to use fractional sketches and make mirrors/patterns in the solid form.

HTH Steve.
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Palmtree
Posts: 104
Joined: Wed Apr 08, 2020 5:06 am

Re: Mirror sketch and Sketcher Symmetry Problem/Question

Post by Palmtree »

Bance wrote: Thu Sep 29, 2022 9:41 am This is not a bug, the sketcher solver accepts the first solution to the possible constraints. It does not mean that it is the only solution.
HTH Steve.
@Bance Now I understand. :) :) :). Many thanks to your prompt response. :D :D :D
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Palmtree
Posts: 104
Joined: Wed Apr 08, 2020 5:06 am

Re: Mirror sketch and Sketcher Symmetry Problem/Question

Post by Palmtree »

Bance wrote: Thu Sep 29, 2022 9:41 am In some cases there are more than one possible outcome. When this happens the vernacular description is 'Flipping'.
Dear Forum member,
If you have come across this Problem/Question (similar to me) and have never knew about "flipping" yet. I have attached a link to a post (Sketcher - solving the flipping problem), it might be helpful. :lol: :lol: :lol:

https://forum.freecadweb.org/viewtopic.php?t=10872
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