flipped normals not showing on parented object #66187

New Issue

eric · 2019-06-27T18:28:12+02:00

eric commented

2019-06-27 18:28:12 +02:00

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: Intel(R) UHD Graphics 630 Intel 4.5.0 - Build 26.20.100.6911

Blender Version
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-06-26 19:03, hash: 155c62b070
Worked: (optional)

When the object (tentacles) is parented to the main body the normals seems to be okay - all blue (viewing it using face orientation checkbox)
but when you join them together only the tentacles get their normals flipped to red.

the problem is that on my headset it looked like backface is on but i couldn't see it in blender because all the normals were in the same direction (blue).

attaching .blend file for your review.face_orientation_bug.blend
as I am not sure how to reproduce the situation.

**System Information** Operating system: Windows-10-10.0.17763 64 Bits Graphics card: Intel(R) UHD Graphics 630 Intel 4.5.0 - Build 26.20.100.6911 **Blender Version** Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-06-26 19:03, hash: `155c62b070` Worked: (optional) When the object (tentacles) is parented to the main body the normals seems to be okay - all blue *(viewing it using face orientation checkbox)* but when you join them together only the tentacles get their normals flipped to red. the problem is that on my headset it looked like backface is on but i couldn't see it in blender because all the normals were in the same direction (blue). attaching .blend file for your review.[face_orientation_bug.blend](https://archive.blender.org/developer/F7552055/face_orientation_bug.blend) as I am not sure how to reproduce the situation.

eric commented

2019-06-27 18:28:12 +02:00

Added subscriber: @EricBu

Alessio Monti di Sopra commented

2019-06-27 19:48:31 +02:00

Added subscriber: @a.monti

Alessio Monti di Sopra commented

2019-06-27 19:48:31 +02:00

Changed status from 'Open' to: 'Archived'

Alessio Monti di Sopra closed this issue

2019-06-27 19:48:31 +02:00

Alessio Monti di Sopra self-assigned this 2019-06-27 19:48:31 +02:00

Alessio Monti di Sopra commented

2019-06-27 19:48:31 +02:00

@EricBu the problem in your file seems to be that the tentacles have a negative scale for the X axis, so when you join them with the other mesh (that have a positive scale instead) the normals get flipped. You can easily reproduce this with two cubes (one with positive scale, one with negative one).

Closing as invalid. If I misunderstood what you meant with the report, please explain a bit more what was the expected behaviour for you.

@EricBu the problem in your file seems to be that the tentacles have a negative scale for the X axis, so when you join them with the other mesh (that have a positive scale instead) the normals get flipped. You can easily reproduce this with two cubes (one with positive scale, one with negative one). Closing as invalid. If I misunderstood what you meant with the report, please explain a bit more what was the expected behaviour for you.

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flipped normals not showing on parented object #66187