Applying negative scale inverts multires displacement #76682

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opened 2020-05-12 14:38:59 +02:00 by Thomas Radeke · 7 comments

System Information
Operating system: Windows 10
Graphics card: RTX 2070

Blender Version
Broken: 2.82a, 2.90 Alpha (542ff416e2)
Worked: 2.79b

Short description of error
When multires-sculpting an object, then mirroring it on any axis and then applying the scale, the multires displacement inverts - turning inside out. Flipping normals (either before or after applying scale) doesn't help.
In 2.79b, multires data is retained correctly after applying scale, although normals need to be flipped afterwards.

Exact steps for others to reproduce the error

  1. Pick the default cube, add a multires modifier to it.
  2. Subdivide a bit for good measure, sculpt something.
  3. In object mode, mirror the object on any axis.
  4. Apply scale.
  5. Observe the sculpt turning inside out.
**System Information** Operating system: Windows 10 Graphics card: RTX 2070 **Blender Version** Broken: 2.82a, 2.90 Alpha (542ff416e274) Worked: 2.79b **Short description of error** When multires-sculpting an object, then mirroring it on any axis and then applying the scale, the multires displacement inverts - turning inside out. Flipping normals (either before or after applying scale) doesn't help. In 2.79b, multires data is retained correctly after applying scale, although normals need to be flipped afterwards. **Exact steps for others to reproduce the error** 1. Pick the default cube, add a multires modifier to it. 2. Subdivide a bit for good measure, sculpt something. 3. In object mode, mirror the object on any axis. 4. Apply scale. 5. Observe the sculpt turning inside out.
Author

Added subscriber: @ThomasRadeke

Added subscriber: @ThomasRadeke

Changed status from 'Needs Triage' to: 'Confirmed'

Changed status from 'Needs Triage' to: 'Confirmed'

Added subscriber: @iss

Added subscriber: @iss

This looks very much like #74361, but since this worked in 2.79, I will leave this open as separate issue.

This looks very much like #74361, but since this worked in 2.79, I will leave this open as separate issue.
Author

I just tested earlier releases - the bug exists since 2.80, so it has probably not been a recent change.

I'm not sure how the displacement is handled internally, but since it's able to invert, would it be possible to have an option to scale the data by an arbitrary number? This would be a workaround at least, and a handy feature at best.

I just tested earlier releases - the bug exists since 2.80, so it has probably not been a recent change. I'm not sure how the displacement is handled internally, but since it's able to invert, would it be possible to have an option to scale the data by an arbitrary number? This would be a workaround at least, and a handy feature at best.
Member

Added subscriber: @JulienKaspar

Added subscriber: @JulienKaspar
Member

A workaround for this is to apply the multires modifier first, then the scale and then un-subdivide a new multires modifier to get the original base mesh back. This will apply the based though.
I think this bug needs to be fixed before implementing #83927.

A workaround for this is to apply the multires modifier first, then the scale and then un-subdivide a new multires modifier to get the original base mesh back. This will apply the based though. I think this bug needs to be fixed before implementing #83927.
Philipp Oeser removed the
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label 2023-02-10 09:12:33 +01:00
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Reference: blender/blender#76682
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