Mirror modifier bisect documentation bug #102883

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John Polstra · 2022-11-30T19:01:02+01:00

John Polstra commented

2022-11-30 19:01:02 +01:00

The description of the Bisect option for the Mirror Modifier states that the "negative" side of the object is kept to perform the mirror process. That is incorrect; the positive side is kept. The description of the Flip option is incorrect in the same way. In both sections, "negative" should be replaced with "positive" and vice versa.

The attached .blend file demonstrates this. It has a plane in which the x<0 side is blue and the x>0 side is red. The plane has a mirror modifier (initially disabled in the viewport) with X selected for the Axis and Bisect options. Enable the modifier and you will see that the red side (x>0) is kept. Set X in the Flip option, and you will see that the blue side (x<0) is kept.

I checked the latest 3.5.0 Alpha daily build (2022-11-29 23:01 ae081b2de1d4) and the latest 3.5 documentation, and confirmed that the documentation is still incorrect.
bisect.blend

The description of the Bisect option for the Mirror Modifier states that the "negative" side of the object is kept to perform the mirror process. That is incorrect; the positive side is kept. The description of the Flip option is incorrect in the same way. In both sections, "negative" should be replaced with "positive" and vice versa. The attached .blend file demonstrates this. It has a plane in which the x<0 side is blue and the x>0 side is red. The plane has a mirror modifier (initially disabled in the viewport) with X selected for the Axis and Bisect options. Enable the modifier and you will see that the red side (x>0) is kept. Set X in the Flip option, and you will see that the blue side (x<0) is kept. I checked the latest 3.5.0 Alpha daily build (2022-11-29 23:01 ae081b2de1d4) and the latest 3.5 documentation, and confirmed that the documentation is still incorrect. [bisect.blend](https://archive.blender.org/developer/F13982686/bisect.blend)

John Polstra commented

2022-11-30 19:01:02 +01:00

Added subscriber: @John-Polstra

Iliya Katushenock commented

2022-12-01 06:56:11 +01:00

Added subscriber: @mod_moder

Iliya Katushenock commented

2022-12-01 06:56:11 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Iliya Katushenock commented

2022-12-01 06:56:11 +01:00

Please, as required by the reports, you should at least provide a link to the page in the documentation and an extract of the line where it says so.

sockseight commented

2022-12-01 09:07:35 +01:00

Added subscriber: @sockseight

John Polstra commented

2022-12-01 17:22:16 +01:00

Mirror Modifier

Bisect
If the mesh is already on both sides of the mirror plane, it is cut by that plane, and only one side (the “negative” one by default) is kept to perform the mirror process.
Flip
When Bisect is enabled on an axis, you can use this setting to switch the side kept and mirrored (i.e. when it is enabled, the “positive” side will be kept, instead of the “negative” one).

[Mirror Modifier ](https://docs.blender.org/manual/en/3.5/modeling/modifiers/generate/mirror.html) ``` Bisect If the mesh is already on both sides of the mirror plane, it is cut by that plane, and only one side (the “negative” one by default) is kept to perform the mirror process. Flip When Bisect is enabled on an axis, you can use this setting to switch the side kept and mirrored (i.e. when it is enabled, the “positive” side will be kept, instead of the “negative” one). ```

Iliya Katushenock commented

2022-12-01 17:29:48 +01:00

Changed status from 'Needs User Info' to: 'Needs Triage'