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Maniphest T73600

mirror + bevel modifier (custom profile) error
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Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.28

Blender Version
Broken: version: 2.82 (sub 6), branch: master, commit date: 2020-02-02 08:28, hash: rBf51286cb8cc8

Short description of error
the new custom profile doesn't work correctly with mirror modifier, in fact on the morrored side the profile looks inverted in some way.

Exact steps for others to reproduce the error
please take a look at the attached blend file and screenshot

hank you.

bevel_custom_bug.blend598 KBDownload

Event Timeline

Massimiliano Puliero (mmaaxx) created this task.Feb 5 2020, 5:23 AM
Philipp Oeser (lichtwerk) changed the task status from Needs Triage to Confirmed.Feb 5 2020, 9:31 AM
Philipp Oeser (lichtwerk) added projects: Modeling, Modifiers.
Philipp Oeser (lichtwerk) changed the subtype of this task from "Report" to "Bug".
Philipp Oeser (lichtwerk) added subscribers: Hans Goudey (HooglyBoogly), Philipp Oeser (lichtwerk).

Can confirm.

@Hans Goudey (HooglyBoogly) : guess this is unexpected?

Hans Goudey (HooglyBoogly) added a comment.Feb 5 2020, 3:57 PM

It's actually expected behavior. This happens because the mirror modifier happens before the bevel modifier.

The bevel modifier does a pass where is makes the orientation consistent along groups of edges, but after the mirror modifier there are two groups of edges, and there's no way for bevel to know that they're supposed to be the same.

So that's it, the profile has the opposite orientation on the other side.

I wouldn't even call this a known issue, it's just expected when there's no guarantee of symmetry with the operations after the mirror modifier.

Philipp Oeser (lichtwerk) added a comment.Feb 5 2020, 4:13 PM

@Hans Goudey (HooglyBoogly) : your call, feel free to close then...

Hans Goudey (HooglyBoogly) closed this task as Archived.Feb 5 2020, 4:23 PM
Hans Goudey (HooglyBoogly) claimed this task.

Thanks for the report @Massimiliano Puliero (mmaaxx). Unfortunately this behavior is expected the way bevel is written, and there are no plans to change how this aspect of the modifier works.

Like I said earlier, moving the mirror to after the bevel is the best way around this.

Please do make another report if you find other issues with the custom profile feature, it's new so it's bound to have some issues.