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Weird face dots in UV editor with cage mode on of subdivision modifier.
Closed, ResolvedPublic

Description

System Information
Operating system: Win 10 pro
Graphics card: Nvidia Gtx 960

Blender Version
Broken: 2.81 (sub 16), branch: master, commit date: 2019-10-28 18:34, hash: 7c1fbe24ca33, type: Release
Worked: (optional)

Short description of error


As you can see in this screenshot I am having weird face dots position in uv editor in cage mode on of subdivision modifier. If I uncheck cage mode face dots appear properly.
Exact steps for others to reproduce the error
Just turn on cage of subdivision modifier and see where the face dots goes in uv editor.

Example file

Event Timeline

Campbell Barton (campbellbarton) lowered the priority of this task from Needs Triage by Developer to Needs Information from User.Wed, Oct 30, 7:43 PM

Please include blend file.

Souvik Karmakar (souvik) raised the priority of this task from Needs Information from User to Needs Triage by Developer.Wed, Oct 30, 8:15 PM
Souvik Karmakar (souvik) updated the task description. (Show Details)

Example file added to the descriiption.

Looks like corrupt geometry, getting a bunch of these, needs more investigation

Invalid Index: at /blender/source/blender/bmesh/intern/bmesh_mesh.c:1717, BM_mesh_elem_index_ensure_ex, vert[2011] invalid index 15, 'Should Never Fail!', 'BM_mesh_elem_index_ensure_ex

Looks like corrupt geometry, getting a bunch of these, needs more investigation

Invalid Index: at /blender/source/blender/bmesh/intern/bmesh_mesh.c:1717, BM_mesh_elem_index_ensure_ex, vert[2011] invalid index 15, 'Should Never Fail!', 'BM_mesh_elem_index_ensure_ex

We can also see it in suzzane.Subsurface modifier with cage on and in uv editor face select mode on.

Not sure what was wrong, not getting the invalid index anymore, need to look at this with a fresh eye...