Custom Split Normals Causes Huge Performance Lag #107505

New Issue

Shady Hamza · 2023-05-01T17:52:33+02:00

Shady Hamza commented

2023-05-01 17:52:33 +02:00

System Information
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2060 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 531.61

Blender Version
Broken: version: 3.6.0 Alpha, branch: main, commit date: 2023-04-29 20:06, hash: adb63a5102cf
Worked: (newest version of Blender that worked as expected)

Short description of error
When an object has a Custom split normals in Geometry Data, it causes huge lag when editing it in edit mode and trying to move faces or verts for example, clearing the custom split normal solves the issue

PS: The attached file still feels abit laggy after clearing the split normals if you could find whats causing it let me know please, Plus I don't know if the whole issue is supposed to be that laggy or this is a bug, Thank you

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]

**System Information** Operating system: Windows-10-10.0.22621-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 2060 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 531.61 **Blender Version** Broken: version: 3.6.0 Alpha, branch: main, commit date: 2023-04-29 20:06, hash: `adb63a5102cf` Worked: (newest version of Blender that worked as expected) **Short description of error** When an object has a Custom split normals in Geometry Data, it causes huge lag when editing it in edit mode and trying to move faces or verts for example, clearing the custom split normal solves the issue PS: The attached file still feels abit laggy after clearing the split normals if you could find whats causing it let me know please, Plus I don't know if the whole issue is supposed to be that laggy or this is a bug, Thank you **Exact steps for others to reproduce the error** [Please describe the exact steps needed to reproduce the issue] [Based on the default startup or an attached .blend file (as simple as possible)]

Test.blend

92 MiB

Screenshot 2023-05-01 184440.png

13 KiB

Shady Hamza added the

labels 2023-05-01 17:52:33 +02:00

Hans Goudey commented

2023-05-01 19:23:07 +02:00

Thanks for the report. Is this a new problem? Were previous versions faster?

Hans Goudey added

Status

Needs Information from User

and removed

Status

Needs Triage

labels 2023-05-01 20:44:37 +02:00

Angus Stanton commented

2023-05-02 14:58:27 +02:00

Not sure if it's related, but I hit an assert in main when I was testing this.

If you do the following steps:

Subdivide default cube any number of times
Set cube to shade smooth
Enable auto smooth
Add custom split normals
Go to edit mode

Then you hit the debug assert at bmesh_mesh_normals.cc:591

Not sure if it's related, but I hit an assert in main when I was testing this. If you do the following steps: 1. Subdivide default cube any number of times 2. Set cube to shade smooth 3. Enable auto smooth 4. Add custom split normals 5. Go to edit mode Then you hit the debug assert at bmesh_mesh_normals.cc:591

Hans Goudey self-assigned this 2023-05-02 16:01:09 +02:00

Hans Goudey added

and removed

labels 2023-05-02 16:01:15 +02:00

Hans Goudey added

Status

Confirmed

Type