Multiresolution sculpt: changing viewport level inside sculpt mode hanging (recalculating modifier?) #87843

New Issue

Vyacheslav Kobozev · 2021-04-26T18:38:15+02:00

2021-04-26 18:38:15 +02:00

System Information
Operating system: Windows-8.1-6.3.9600-SP0 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40

Blender Version
Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: 02948a2cab

As title says. I expect, that viewport level change will not influence to sculpt mode at all and will not calculate level untill I'll go to object mode.

2021-04-26_19-33-59.mp4

**System Information** Operating system: Windows-8.1-6.3.9600-SP0 64 Bits Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40 **Blender Version** Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: `02948a2cab` As title says. I expect, that viewport level change will not influence to sculpt mode at all and will not calculate level untill I'll go to object mode. [2021-04-26_19-33-59.mp4](https://archive.blender.org/developer/F10039545/2021-04-26_19-33-59.mp4)

Vyacheslav Kobozev commented

2021-04-26 18:38:15 +02:00

Added subscriber: @Vyach

Falk David commented

2021-04-26 19:53:47 +02:00

Added subscriber: @filedescriptor

Falk David commented

2021-04-26 19:53:47 +02:00

Hm, unfortunately, I think there is no good way around that. First, it's hard to know when to update and when not to. There is no good api to check for open viewports in the right mode etc. But more importantly, when should the update occur? Because it has to be updated at some point later. AFAIK there is no concept of a "delayed update" in the dependency graph. I presume that is what you would have to do.
But even then, it's probably better to do the update right away. If Blender suddenly freezes for no apparent reason 10 min after changing the setting because you went back to another mode, seems like not very good design.
IMO a better solution is to display progress on expensive tasks as well as an option to cancel them. So, in this case, you would change the setting, the UI stays responsive and you see the progress in the bottom bar with an X to cancel the operation. But that would be a bigger project for another time.

Hm, unfortunately, I think there is no good way around that. First, it's hard to know when to update and when not to. There is no good api to check for open viewports in the right mode etc. But more importantly, when should the update occur? Because it has to be updated at some point later. AFAIK there is no concept of a "delayed update" in the dependency graph. I presume that is what you would have to do. But even then, it's probably better to do the update right away. If Blender suddenly freezes for no apparent reason 10 min after changing the setting because you went back to another mode, seems like not very good design. IMO a better solution is to display progress on expensive tasks as well as an option to cancel them. So, in this case, you would change the setting, the UI stays responsive and you see the progress in the bottom bar with an `X` to cancel the operation. But that would be a bigger project for another time.

Vyacheslav Kobozev commented

2021-04-26 20:42:33 +02:00

to check for open viewports in the right mode

all viewports opened in the same mode atm. There is no local modes, AFAIK

when should the update occur?

When I go back to object mode, if option was changed (if viewport level != viwport level previous)
there is only one object can be in sculpt mode, so there can be only one flag.

Okay, it will be nice, if I go object mode and get update immediately. But no. When I switch, blender updates again, and I shoul wait again…
So it is already freezes. So we have even worse design.

to display progress on expensive tasks as well as an option to cancel them.

Agree. There is topic at RCS: Panic button

> to check for open viewports in the right mode all viewports opened in the same mode atm. There is no local modes, AFAIK > when should the update occur? When I go back to object mode, if option was changed (if viewport level != viwport level previous) there is only one object can be in sculpt mode, so there can be only one flag. Okay, it will be nice, if I go object mode and get update immediately. But no. When I switch, blender updates again, and I shoul wait again… So it is already freezes. So we have even worse design. > to display progress on expensive tasks as well as an option to cancel them. Agree. There is topic at RCS: [Panic button ](https://blender.community/c/rightclickselect/4nhbbc/)

Omar Emara commented

2022-02-24 11:00:57 +01:00

Added subscriber: @OmarEmaraDev

Omar Emara commented

2022-02-24 11:00:57 +01:00

Changed status from 'Needs Triage' to: 'Archived'

Omar Emara closed this issue

2022-02-24 11:00:57 +01:00

Omar Emara commented

2022-02-24 11:00:57 +01:00

This looks more of a potential optimization than a bug. And with regards to the work being done after going to object mode, it doesn't look similar to the work being done when changing the levels. So Blender is probably not duplicating work and I wouldn't consider this a bug. Both cases are shown below.

For user requests and feedback, please use other channels: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests

For more information on why this isn't considered a bug, visit: https://wiki.blender.org/wiki/Reference/Not_a_bug

This looks more of a potential optimization than a bug. And with regards to the work being done after going to object mode, it doesn't look similar to the work being done when changing the levels. So Blender is probably not duplicating work and I wouldn't consider this a bug. Both cases are shown below. ![20220224-114905.png](https://archive.blender.org/developer/F12885330/20220224-114905.png) ![20220224-115258.png](https://archive.blender.org/developer/F12885329/20220224-115258.png) For user requests and feedback, please use other channels: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests For more information on why this isn't considered a bug, visit: https://wiki.blender.org/wiki/Reference/Not_a_bug

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

Multiresolution sculpt: changing viewport level inside sculpt mode hanging (recalculating modifier?) #87843