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smooth mask in sculpt produces artifacts.
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Description

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.12

Blender Version
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-11-18 12:53, hash: rB115a5bf65a6b

Short description of error
smooth mask in sculpt mode produces artifacts.

Exact steps for others to reproduce the error
please check the video

https://youtu.be/FW3wxz3FN0w

thank you

Event Timeline

Philipp Oeser (lichtwerk) lowered the priority of this task from 90 to 30.Nov 19 2019, 1:04 PM

Looks like a private video.
[videos can help btw., but often these are not enough for a complete bug report, so please also share your .blend file and steps to reproduce...]

yes, sorry, now the video should be available.

I attached the blend file.

how to reporduce:
1- create a grid
2- assign multi-resolution modifier at level 4 or 5
3- create a very sharp mask using the lasso tool
4- use the mask brush to smooth the borders of the mask.

thank you.
Max

Cannot reproduce here.
Tried both on preview level 0 and preview level 4.
Tried both in your file and from scratch.

System Information
Operating system: Linux-5.3.7-200.fc30.x86_64-x86_64-with-fedora-30-Thirty 64 Bits
Graphics card: GeForce GTX 970M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21
version: 2.81 (sub 16), branch: master, commit date: 2019-11-18 12:53, hash: rB115a5bf65a6b

Not sure if this has anything to do with rBSfe86375d1c63: Force sculpting on highest multires level?
Does this happen without Addons as well?

CC @Pablo Dobarro (pablodp606)

Can confirm... But this only happens when using the Multires mod. On regular mesh it works fine.