Page MenuHome
Create Task
Maniphest T81060

Vertex Slide and Loop Cut and Slide tools breaks the UVs and Vertex Colors after topology changes [new or deleted] (if CustomSplitNormals are present)
Closed, ResolvedPublicBUG
Actions

Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.87

Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-22 12:02, hash: rB8d1123ba220b
Worked: Blender 2.83 LTS
Caused by rB93c8955a722b: Mesh Edit: preserve Custom Normal vectors in topology operators.

Short description of error
Vertex Slide and Loop Cut and Slide tools breaks the UVs and Vertex Colors on new vertices, please see the video or the attached .blend file.

Exact steps for others to reproduce the error

  1. Open the attached file
  2. Press J to cut polygons between selected vertices
  3. Select new vertex
  4. Slide it with G G hotkeys
  5. If you Undo the Vertex Slide, you can slide it again without this problem, but as soon you create a new geometry -- it happens again
  6. Same happens with Loop Cut and Slide tool (Ctrl + R)

Thank you for checking out this bug!

Blender_2.91_VetexSlideProblem.blend1 MBDownload

Revisions and Commits

rB Blender
D9159rBaafd71a8a160 Fix T81060: CustomData Correction sometimes breaks UVs and Vertex Colors

Related Objects

Event Timeline

Yan Kansky (Yan_Kansky) created this task.Sep 22 2020, 5:01 PM
Yan Kansky (Yan_Kansky) updated the task description. (Show Details)Sep 22 2020, 5:04 PM
Yan Kansky (Yan_Kansky) renamed this task from Vertex Slide tool breaks the UVs and Vertex Colors on new vertices to Vertex Slide and Loop Cut and Slide tools breaks the UVs and Vertex Colors on new vertices.Sep 22 2020, 5:17 PM
Yan Kansky (Yan_Kansky) updated the task description. (Show Details)
Martijn Versteegh (Baardaap) changed the task status from Needs Triage to Confirmed.Sep 22 2020, 7:23 PM
Martijn Versteegh (Baardaap) added a subscriber: Martijn Versteegh (Baardaap).

As I have everything set up for git bisecting between 2.83 and 2.90 I'll do a bisect and find out which commit introduced this.

Martijn Versteegh (Baardaap) added a comment.Sep 22 2020, 9:30 PM

I'm done bisecting.

The first offending commit is 93c8955a7

Mesh Edit: preserve Custom Normal vectors in topology operators.

I have no clue how this code works, so someone else should look into it.

Philipp Oeser (lichtwerk) added a subscriber: Philipp Oeser (lichtwerk).Sep 23 2020, 11:21 AM

Thx bisecting @Martijn Versteegh (Baardaap) !

Philipp Oeser (lichtwerk) updated the task description. (Show Details)Sep 23 2020, 11:21 AM
Philipp Oeser (lichtwerk) added a project: Modeling.
Philipp Oeser (lichtwerk) renamed this task from Vertex Slide and Loop Cut and Slide tools breaks the UVs and Vertex Colors on new vertices to Vertex Slide and Loop Cut and Slide tools breaks the UVs and Vertex Colors on new vertices (if CustomSplitNormals are present).Sep 23 2020, 12:44 PM
Philipp Oeser (lichtwerk) changed the subtype of this task from "Report" to "Bug".Sep 23 2020, 12:49 PM
Yan Kansky (Yan_Kansky) added a comment.EditedSep 23 2020, 2:21 PM

Can confirm, it happens only when CustomSplitNormals are present!

Campbell Barton (campbellbarton) moved this task from Backlog to Bugs (Transform) on the Modeling board.Sep 24 2020, 5:54 AM
Philipp Oeser (lichtwerk) renamed this task from Vertex Slide and Loop Cut and Slide tools breaks the UVs and Vertex Colors on new vertices (if CustomSplitNormals are present) to Vertex Slide and Loop Cut and Slide tools breaks the UVs and Vertex Colors after topology changes [new or deleted] (if CustomSplitNormals are present).Oct 2 2020, 9:30 AM
Philipp Oeser (lichtwerk) triaged this task as High priority.
Philipp Oeser (lichtwerk) mentioned this in T81364: Edge Slide operator destroys entire UV map.
Philipp Oeser (lichtwerk) merged a task: T81364: Edge Slide operator destroys entire UV map.
Philipp Oeser (lichtwerk) added a subscriber: Demeter Dzadik (Mets).
Demeter Dzadik (Mets) merged a task: T81388: Vertex slide messes up UVs.Oct 2 2020, 4:33 PM
Demeter Dzadik (Mets) added a subscriber: Ian Jones (Macwelshman).
Germano Cavalcante (mano-wii) added a revision: D9159: Fix T81060: Vertex Slide and Loop Cut and Slide tools breaks the UVs and Vertex Colors after topology changes [new or deleted] (if CustomSplitNormals are present).Oct 9 2020, 4:20 AM
Germano Cavalcante (mano-wii) closed this task as Resolved by committing rBaafd71a8a160: Fix T81060: CustomData Correction sometimes breaks UVs and Vertex Colors.Oct 12 2020, 2:01 PM
Germano Cavalcante (mano-wii) claimed this task.
Germano Cavalcante (mano-wii) added a commit: rBaafd71a8a160: Fix T81060: CustomData Correction sometimes breaks UVs and Vertex Colors.
Philipp Oeser (lichtwerk) mentioned this in T81866: UVS Get Screwed Up After Removing Geometry and Moving with "Correct Face Attributes" Enabled..Oct 20 2020, 12:49 PM