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Pose brush breaks with subdiv modifier
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Description

System Information
Operating system: Linux-4.15.0-64-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: Quadro GP100/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.40

Blender Version
Broken: version: 2.81 (sub 13), branch: master, commit date: 2019-10-03 09:11, hash: rBf6a90f018cfa

Short description of error
When using the Pose Brush in Sculpt Mode on an object that has a subdivision modifier active, the result becomes distorted.

Event Timeline

I can't reproduce, can you send me that file?

Germano Cavalcante (mano-wii) lowered the priority of this task from 90 to 80.Oct 3 2019, 5:21 PM

@Pablo Dobarro (pablodp606)
Try it with a subdivided monkey. I am able to reproduce it on factory settings and others at the studio here have it too.
It's more noticeable if the base mesh has more geometry too.

Confirmed. This is affecting all brushes and tools when subdivision surface is enabled, not only the pose brush. Other constructive modifiers are working fine.
@Brecht Van Lommel (brecht) Do you know what can be happening here? Is subdivision surface modifying the original vertex coordinates?