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Switching to a mode that has a tool set which is not available for that object causes error [e.g Select Box tool is available if paint mask is enabled, if it is disabled it causes error]
Confirmed, NormalPublicBUG

Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.92

Blender Version
Broken: version: 2.83.0, branch: master, commit date: 2020-06-03 14:38, hash: rB211b6c29f771
Worked: (newest version of Blender that worked as expected)

Short description of error
[when i try open vertex paint or weight paint , brush and color bar not coming to viewport]

Exact steps for others to reproduce the error
[after basic modeling something i apply all modifer and try to create uv but i cant do properly. So after unsuccessful attempt i tried to paint weight paint but color and other bar not coming to screen. But if i create new blend file and append it. Also work and i can create but after some paint also broke vertex paint file and mine locak vertex paint parts gone. btw i also cant open in new file as link...

Event Timeline

Philipp Oeser (lichtwerk) changed the task status from Needs Triage to Confirmed.Thu, Jun 18, 10:40 AM
Philipp Oeser (lichtwerk) changed the subtype of this task from "Report" to "Bug".

Can confirm.

This happens because on one object in the file (namely Cube.006) paint mask is enabled and if this is enabled, you get the Select Box as well.


So Select Box is now chosen as the tool for Vertex Paint, but going to Vertex Paint on an object without paint mask enabled, this Tool wont be available.

Instead of throwing the error here, I think it should just fall back to a valid tool here?

Philipp Oeser (lichtwerk) renamed this task from cant open vertex paint mode to Switching to a mode that has a tool set which is not available for that object causes error [e.g Select Box tool is available if paint mask is enabled, if it is disabled it causes error].Thu, Jun 18, 10:44 AM

Forgot to add: workaround for now is to select Cube.006, select a tool other than Select Box, go to object mode.
From here on, you should not get any errors selecting other objects and switching to vertex paint mode.