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weight paint gradient is broken when mirror modifier is enabled
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Description

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: 67EF:CF ATI Technologies Inc. 4.5.13474 Core Profile Context 22.19.162.4

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: rBf6cb5f54494e
Worked: (optional)

Short description of error
Gradaient tool in weight paint mode is broken when mirror modifier is enabled. In particular, drag to start from out of mesh is not working.
Related task : https://developer.blender.org/T65872

Exact steps for others to reproduce the error

  1. Move the default cube in Edit mode for don't overlap the mirror
  2. Add mirror modifier to the cube
  3. Use Gradient tool in weight paint mode

Event Timeline

i follow this step, here all work fine, i have gradient weight paint working withour error or glitch on linux Blender 2.80 f6cb5f54494e (Stable), OpenSUSE Tumbleweed/KDE, AMD FX8350, 16GB DDR3, GTX690 2+2 GB VRam- Nvidia drivers 435.21, Factory Setting applied

Update your GPU RX 460 drivers from Amd support site with adrenalin 19.10.1 can solve/mitigate this problem

I can reproduce the bug on debian 10.1 Pentium G3220, iGPU.

Philipp Oeser (lichtwerk) lowered the priority of this task from 90 to 50.Nov 20 2019, 4:17 PM

I can confirm

System Information
Operating system: Linux-5.3.11-200.fc30.x86_64-x86_64-with-fedora-30-Thirty 64 Bits
Graphics card: GeForce GTX 970M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.31

Blender Version
Broken: version: 2.82 (sub 1), branch: master, commit date: 2019-11-20 13:58, hash: rB0418e2894467