face orientation
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face orientation
Hello, everyone. Why is the orientation of the face as shown in the pic "Reversed'?
- Shalmeneser
- Veteran
- Posts: 9475
- Joined: Wed Dec 23, 2020 12:04 am
- Location: Fr
Re: face orientation
Because there is no file ?
Re: face orientation
What is the meaning? This model is in Stp format and then I opened it in FreeCAD. Now I save it as Fcstd. it is still reversed.
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- 1.FCStd
- (8.89 KiB) Downloaded 15 times
Re: face orientation
"Reversed" mean the normal is facing inward, so speaking for FC it is a "hole".
As it is not a native shape, it is up to you to find why the face is "reversed".
If it is reversed in the original STEP file is "broken by design"
If it is not reversed could be "imported wrong" by FC.
Regards
Carlo D.
GitHub page: https://github.com/onekk/freecad-doc.
- In deep articles on FreeCAD.
- Learning how to model with scripting.
- Various other stuffs.
Blog: https://okkmkblog.wordpress.com/
- In deep articles on FreeCAD.
- Learning how to model with scripting.
- Various other stuffs.
Blog: https://okkmkblog.wordpress.com/
Re: face orientation
Thank you for your reply! However, I can't check if it's due to import or design because there is no operation history in stp file. So is there any method to check it or fix the mistake in the design? Thank you!onekk wrote: ↑Wed Oct 05, 2022 7:00 am "Reversed" mean the normal is facing inward, so speaking for FC it is a "hole".
As it is not a native shape, it is up to you to find why the face is "reversed".
If it is reversed in the original STEP file is "broken by design"
If it is not reversed could be "imported wrong" by FC.
Re: face orientation
I'm not aware of methods a part from using a method that invert the normal of the face, but this will involve to select the face and use some Python Console commands. I don't remember what is the metod probably something simlar to invert().xc22143 wrote: ↑Wed Oct 05, 2022 7:18 amThank you for your reply! However, I can't check if it's due to import or design because there is no operation history in stp file. So is there any method to check it or fix the mistake in the design? Thank you!onekk wrote: ↑Wed Oct 05, 2022 7:00 am "Reversed" mean the normal is facing inward, so speaking for FC it is a "hole".
As it is not a native shape, it is up to you to find why the face is "reversed".
If it is reversed in the original STEP file is "broken by design"
If it is not reversed could be "imported wrong" by FC.
try to search "invert normal" on the search box and see if some results make some light.
Regards
Carlo D.
GitHub page: https://github.com/onekk/freecad-doc.
- In deep articles on FreeCAD.
- Learning how to model with scripting.
- Various other stuffs.
Blog: https://okkmkblog.wordpress.com/
- In deep articles on FreeCAD.
- Learning how to model with scripting.
- Various other stuffs.
Blog: https://okkmkblog.wordpress.com/
Re: face orientation
In general this is hard to say. Sometimes it's the OCC algorithm that produces a reversed face but in many cases the reason is that the shape was already broken before running the algorithm such as invalid tolerances or other anomalies.Hello, everyone. Why is the orientation of the face as shown in the pic "Reversed'?
In order to get any hint about problems you should run the geometry check from the Part wb on the affected object and its father object.
Re: face orientation
AFAICT there are no faces with flipped normals in the model. And "Reversed" has a different meaning. It means the Surface the Face is based on has opposite normal(s).
- Shalmeneser
- Veteran
- Posts: 9475
- Joined: Wed Dec 23, 2020 12:04 am
- Location: Fr
Re: face orientation
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- 1_SHALM.FCStd
- (49.12 KiB) Downloaded 14 times
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- Annotation 2022-10-05 131745.jpg (18.28 KiB) Viewed 405 times