Undo of the first stroke after entering sculpt mode for 2.8 models is lagging #71564
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Reference: blender/blender#71564
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System Information
Operating system: Darwin-19.0.0-x86_64-i386-64bit 64 Bits
Graphics card: Intel Iris OpenGL Engine Intel Inc. 4.1 INTEL-14.2.16
Blender Version
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-11-15, hash:
c25a910e4eShort description of error
I can't draw by any brush without lag if I open 2.8 files with different sculpted models. Lag is noticeable after the first undo after a brush stroke.
Lagging may be incredibly huge and sculpting in 2.8 in comparison with 2.81 is like jet. If I'm trying to sculpt from scratch something in 2.81, it seems to have no problems like these.
My models from 2.8 are high-poly so this is the reason maybe.
Exact steps for others to reproduce the error
Open high poly mesh in sculpt mode (few million polygons), make one stroke and then undo. Lag is noticeable.
[Developer note: it may only work in 2.8 specific files, still pending file from reporter]
Added subscriber: @bokoa
Added subscriber: @Leha
Does it happen when switching brushes and brush size? This is known issue. May be fixed in today builds https://developer.blender.org/T71434
This comment was removed by @bokoa
Yeah, of course, it happens when switching brush, changing its size, strength or detail also. Forgot about it.
Added subscriber: @dfelinto
Changed status from 'Open' to: 'Resolved'
Thanks for the report, but as mentioned above, please try the latest daily build: https://builder.blender.org/download/
If the problem persists, please let us know so we can re-open the report. Don't forget to mention the specific version you tested again.
At least the changing size is supposed to be fixed already.
Well, I was testing 2.81 Beta November 15, 00:52:41 -
c25a910e4etoday, and should to say the lagging is gone almost completely - I can switch brushes, change size and detail without lags, but it still appears when zoomed quite close to high-poly mesh then I'm trying to turn on dyntopo and it starts lagging quite much until I zoom out and zoom in scrolling the mouse hard. In 2.8 projects that lagged are work fine.Ah, just noticed that after undo operation impossible to do anything with brushes, it's super lagging.
Changed status from 'Resolved' to: 'Open'
By doing anything with brushes you mean, to edit them? Or to scupt?
Also not clear, if you start the sculpt from scratch in the latest Blender do you still have the problem? Or only if you start in 2.80 and bring to 2.81?
And we need a file to test things.
And another question, you do not have the problem in 2.80 right (please double-check)? Only in the latest Blender.
Very hard to size brush, draw, switch etc after undo operation, after switching from edit mode to sculpt mode. Now I will try to attach the file
Yes. Only in the latest Blender
I mentioned it in https://developer.blender.org/T71434 : Undo of the first stroke after entering sculpt mode is lagging
Exact steps for others to reproduce the error:
Open high poly mesh in sculpt mode (few million polygons), make one stroke and then undo. Lag is noticable
I think this bug should be renamed to "Undo of the first stroke after entering sculpt mode of high poly mesh is lagging" to not be confusing
Can't upload at the moment, but It's a human body sculpted fully in 2.8, then a litttle bit in 2.81 with dyntopo only. Project consists only of two meshes it's body and hair. It's really high-poly. I just cant find something similar that lagging like this ralative the issues with brush, switching modes, save and undo operations I mentioned, all other projects 2.8 made seems to be have no problems. In previous build I was testing yesterday all sculpts 2.8 made were really laggy.
@Leha ok we still need a file to test, so waiting for it
@Leha also, does it happen with files created from scratch in the latest 2.81?
Laggy sculpting in 2.81 with 2.8 modelsto Undo of the first stroke after entering sculpt mode for 2.8 models is laggingI was trying to create something complicated from scratch with union of many meshes today to reproduce, and don't see nothing cause troubles.
file with the problem is here!
sculpt_test.blend
Added subscriber: @PabloDobarro
Alright, I will test shortly. @Leha do you have the same problem? If so what is your OS / graphic card / driver?
@bokoa ok, so for now we assume it only happens with files from 2.80. I guess the same for 2.79? It must have been a default option that changed since. @PabloDobarro any clues?
@dfelinto Yes it happens with files created from scratch in latest 2.81 builds.
Exact steps for others to reproduce the error:
Notice lag (depends on performance of your system)
It is caused by PBVH rebuilds as mentioned in https://developer.blender.org/T71434
I see it as either only some 2.8 files or high-poly models trouble . Trying to find something from 2.79 to check..
For the records, I cannot reproduce it here:
Operating system: Linux-5.3.0-23-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce GTX 960M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.26
I've tested with 3 2.79 models, not noticed the problem
this is a 2.79 model thats behavior exactly as I sent above my model produces
apply mirror modifier
apply subdivision modifier to 3
sculpt it
result - lagging
sculpt_test279.blend
2.8 has no such big lags with that model also, just a little bit relative to my computer performance, absolutely comfortly to work
Recorded this video that shows how to reproduce lagging of undo. Lag happens only when undoing first brush stroke. This is just a default cube subdivided few times to get 6 million polygons. File size is 860 MB so I don't think it's a good idea to upload it.
In 2.80 there was no such a lag.
2019-11-16 19-23-42.mp4
Added subscriber: @jfmatheu
Added subscriber: @ideasman42
While I cant redo the lag (or at least not much lag), It's reading the global undo state which would be the cause.
Checking on a fix.
This issue was referenced by
1cb07530a9Changed status from 'Open' to: 'Resolved'
Guys, I sculpted today from scratch almost same sized high-poly mesh like a human body in 2.81 and can say for sure that the reason is not just an undo stroke operation. When size reaches about 200 k verts and 200k faces it starts to lagging while making brush strokes. My project file in which I noticed the lags for first time was about 60 mb made in 2.8, but new file is 60 mb also, made in 2.81, they are very similar and both lagging in 2.81 but not in 2.8. I think this is an important information for you to fix this in future probably. Thanks!
@bokoa please make a new bug report with details of how to redo.