Poor performance switching between Object/Edit modes and using Undo when using subsurface modifier #59833

New Issue

luis.boisvert@gmail.com · 2018-12-25T02:35:07+01:00

2018-12-25 02:35:07 +01:00

System Information
Operating system: Windows 10 Pro 64-bit (10.0, Build 17134) (17134.rs4_release.180410-1804)
Graphics card: NVIDIA GeForce GTX 580

Blender Version
Broken: 2.80 Beta, nightly builds after 2018-12-01

Worked: 2.80 Alpha, 2018-11-21

Example setup:
Default cube, subdivided eight times and triangulated. (972 faces).
Subsurf modifier set to 1 level, Catmull-Clark

There is a 2-3 second delay when switching between Object and Edit mode or undoing any action, including a selection. This delay is not present in 2.79 or in 2.80a, 2018-11-11 build.

The delay is more noticeable in meshes that include triangles. Cube subdivided 8 times and triangulated is worse than subdivided 10 times.

The delay becomes extreme when using large n-gons. A cube subdivided 11 times, with the top faces replaced by an 88 corner polygon induces 5-6 second delays.

None of these delays are present enough to be noticable in versions earlier than 2018-11-21.

I have tested 11-11, 11-20, 11-21, 12-01, 12-09 and 12-24. All of the December builds I have tried behave the same.

**System Information** Operating system: Windows 10 Pro 64-bit (10.0, Build 17134) (17134.rs4_release.180410-1804) Graphics card: NVIDIA GeForce GTX 580 **Blender Version** Broken: 2.80 Beta, nightly builds after 2018-12-01 Worked: 2.80 Alpha, 2018-11-21 Example setup: Default cube, subdivided eight times and triangulated. (972 faces). Subsurf modifier set to 1 level, Catmull-Clark There is a 2-3 second delay when switching between Object and Edit mode or undoing any action, including a selection. This delay is not present in 2.79 or in 2.80a, 2018-11-11 build. The delay is more noticeable in meshes that include triangles. Cube subdivided 8 times and triangulated is worse than subdivided 10 times. The delay becomes extreme when using large n-gons. A cube subdivided 11 times, with the top faces replaced by an 88 corner polygon induces 5-6 second delays. None of these delays are present enough to be noticable in versions earlier than 2018-11-21. I have tested 11-11, 11-20, 11-21, 12-01, 12-09 and 12-24. All of the December builds I have tried behave the same.

luis.boisvert@gmail.com commented

2018-12-25 02:35:07 +01:00

Added subscriber: @luis.boisvert

Gavin Scott commented

2018-12-25 03:08:51 +01:00

Added subscriber: @GavinScott

Gavin Scott commented

2018-12-25 03:08:51 +01:00

I believe you're seeing the result of the switch to OpenSubdiv that happened around then. The current implementation lacks the CPU and GPU acceleration options that existed in 2.79, and is generally at least 5x slower than the old Blender subdiv code (it can also be substantially worse) which had been in use in 2.80 prior to the switch-over that happened just before Beta.

The devs have said that performance will be improved before the final 2.80 release, but full GPU acceleration will be a post 2.80 project..

I believe you're seeing the result of the switch to OpenSubdiv that happened around then. The current implementation lacks the CPU and GPU acceleration options that existed in 2.79, and is generally at least 5x slower than the old Blender subdiv code (it can also be substantially worse) which had been in use in 2.80 prior to the switch-over that happened just before Beta. The devs have said that performance will be improved before the final 2.80 release, but full GPU acceleration will be a post 2.80 project..

Brecht Van Lommel commented

2018-12-27 11:55:00 +01:00

Added subscriber: @brecht

Brecht Van Lommel commented

2018-12-27 11:55:00 +01:00

Changed status from 'Open' to: 'Archived'

Brecht Van Lommel closed this issue

2018-12-27 11:55:00 +01:00

Brecht Van Lommel self-assigned this 2018-12-27 11:55:00 +01:00

Brecht Van Lommel commented

2018-12-27 11:55:00 +01:00

Note however there are still some missing features and performance problems in the new implementation. Particularly animation playback and moving of vertices in edit mode will be improved before the final 2.80 release, to bring it back to 2.7x level.

https://wiki.blender.org/wiki/Reference/Release_Notes/2.80/Modeling#Subdivision_Surfaces_and_Multires

> Note however there are still some missing features and performance problems in the new implementation. Particularly animation playback and moving of vertices in edit mode will be improved before the final 2.80 release, to bring it back to 2.7x level. https://wiki.blender.org/wiki/Reference/Release_Notes/2.80/Modeling#Subdivision_Surfaces_and_Multires

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Poor performance switching between Object/Edit modes and using Undo when using subsurface modifier #59833