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Multires: models from 2.79 have glitches in 2.80
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System Information
Operating system: windows 10 pro
Graphics card:and rx580

Blender Version
Broken:2.79b to 2.80.0 git925380050d0 windows 64
(example: 2.79b release)
(example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen)
Worked: (optional)

Short description of error
After sculpting my model in 2.79, I opened it on 2.8 and some weird lines appeared. The only modifier used is multires 8 subdivisions.

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).

Event Timeline

Jacques Lucke (JacquesLucke) lowered the priority of this task from 90 to 50.Jan 8 2019, 12:58 PM

Don't know if this is a bug in the current code or an incompatibility between an old and new algorithm. Do you know what could cause this, @Sergey Sharybin (sergey)?

@Filipe Aguiar (mrfla14) Can you reproduce this in another smaller file?

I can try with other files. Gimme some time.

Yes, it can easily be reproduced with even lower subdivisions on the multires.

Brecht Van Lommel (brecht) renamed this task from sculpted model glitch from 2.79 to 2.8 to Multires: models from 2.79 have glitches in 2.80.May 29 2019, 2:37 PM