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Maniphest T99365

Certain objects (probably depend on mesh topology) will cause extrime lag after adding Subdivision modifier
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Description

System Information
Operating system: WIndows 10 Home
Graphics card: RTX 2060, Studio Drivers

Blender Version
Broken: 2.93, 3.1.2
Worked: -

Short description of error
Object with 15k polygons, empty modifier stack will create huge lag (can crush blender as well i guess) if you try to put Subdivision Modifier on it.
For same Blender scene object with 49k polygons will not create any really noticiable lag in same situation.
It will happen in both GPU Subdivision on or off.

Exact steps for others to reproduce the error
Try to put Subdivision modifier into object next to the cube. It will create huge lag before (even if) it will finally apply and whole Blender window will response again.

subd_issue.blend4 MBDownload

additional info
The file was also tested on different PC with Linux Manjaro 64bit OS, GTX 1070 with same results. It create huge lag, make Blender window not responding, and after lag it finally apply the modifier.

Related Objects

Event Timeline

Alexander (lybimovav) created this task.Jul 3 2022, 10:28 PM
Jesse Yurkovich (deadpin) added a subscriber: Jesse Yurkovich (deadpin).Jul 4 2022, 1:23 AM

This is due to the large 292 sided n-gon face on that object. If you quad-fill it, or remove it entirely, things are fine. This is a duplicate of T60733/T59333

Jesse Yurkovich (deadpin) closed this task as a duplicate of T60733: Subdivision Surface Performance Degrades Markedly With Non-Quad Meshes.Jul 4 2022, 1:23 AM
Alexander (lybimovav) mentioned this in T60733: Subdivision Surface Performance Degrades Markedly With Non-Quad Meshes.Jul 11 2022, 2:18 PM