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Unexpected loop cut behavior with "Topology Mirror"
Open, Confirmed, MediumPublic

Description

System Information
Linux (Arch) intel amd64 + NVidia 1070M

Blender Version
2.79b

Short description of error

2-way symmetrical mesh (x and y) could not be properly loop cut when Topology Mirror was enabled. Some midpoint vertices attempted to mirror to the other side of the mesh, causing massive deformation of shape.

Exact steps for others to reproduce the error

http://pasteall.org/blend/index.php?id=50607

Attempt to loop-cut-and-slide the car in half (dividing the longest edges). Mirror modifier is not necessary to reproduce. Only disabling "Topology Mirror" on the tool drawer will allow loop cuts to behave properly. Many other harder-to-describe loop cuts fail to meet expectations (on this same model).

Details

Type
Bug

Event Timeline

Here's the blend directly uploaded, in case pasteall expires it.

Philipp Oeser (lichtwerk) claimed this task.
Philipp Oeser (lichtwerk) triaged this task as Confirmed, Medium priority.

Can confirm, will have a look

Note: in 2.8 X Mirror is not working atm. (tried to make that work in D3869)