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Maniphest T78900

Single vertex sliding crashes
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Description

System Information
Operating system: Linux-5.7.8-200.fc32.x86_64-x86_64-with-fedora-32-Thirty_Two 64 Bits
Graphics card: GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.100

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-13 15:53, hash: rB2b5e21fe00e8
Worked: Blender 2.83b

Short description of error
When both in multi-object edit mode and having proportional editing enabled, attempting to slide a single vertex (G) results in an instant crash.
Sliding a multiple-vertex selection (either connected or separate) or using other selection modes (edge select or face select) does not show the same issue.

Exact steps for others to reproduce the error
Create two objects, and enter multi-object edit mode with both of them selected. Enable proportional editing, and then slide a single vertex in any direction.

Revisions and Commits

rB Blender
rB1e5ce391563f Fix T78900: Single vertex sliding crashes

Related Objects

Event Timeline

Lincoln Deen (Linkun) created this task.Jul 14 2020, 12:19 AM
Hans Goudey (HooglyBoogly) changed the task status from Needs Triage to Confirmed.Jul 14 2020, 2:33 AM
Hans Goudey (HooglyBoogly) triaged this task as High priority.
Hans Goudey (HooglyBoogly) changed the subtype of this task from "Report" to "Bug".
Hans Goudey (HooglyBoogly) added a project: Modeling.
Hans Goudey (HooglyBoogly) added subscribers: Germano Cavalcante (mano-wii), Hans Goudey (HooglyBoogly).

Thanks for the report.

@Germano Cavalcante (mano-wii) I wonder if this relates to some of the refactoring you were doing recently. It doesn't happen if the vertices are connected in any way. Curious that it only happens in multi-object edit mode too.

Germano Cavalcante (mano-wii) added a comment.Jul 14 2020, 2:19 PM

My guess is that the problem was introduced by rBa64b8aca.
The real problem is that the vert slide code is unstable.
Submitting a fix...

Germano Cavalcante (mano-wii) closed this task as Resolved by committing rB1e5ce391563f: Fix T78900: Single vertex sliding crashes.Jul 14 2020, 2:33 PM
Germano Cavalcante (mano-wii) claimed this task.
Germano Cavalcante (mano-wii) added a commit: rB1e5ce391563f: Fix T78900: Single vertex sliding crashes.