blender/blender
148
472
Fork 692
Code Issues 6.7k Pull Requests 898 Projects 18 Wiki Activity

Dyntopo: Performance hit when moving the viewport #76109

New Issue
Open
opened 2020-04-26 01:19:42 +02:00 by Roman Kornev · 18 comments
Roman Kornev commented 2020-04-26 01:19:42 +02:00
Copy Link

System Information
Operating system: Win10x64
Graphics card: GTX 1080Ti

Blender Version
Broken: 2.82 - 2.90 f96a689b3b (much worse in 2.9)
Worked: Unknown

Short description of error
When I turn dyntopo on with a high poly count model, the viewport becomes extremely slow, even if I'm not sculpting and just rotating around.
As soon as I switch dyntopo off or switch modes, it's butter smooth again. Where I'm looking also seems to have an effect on framerate.
Why should a feature related to actual sculpting affect performance when just looking around?
Dyntopo ON 2.90:
2020-04-26 02.13.26 Blender_ [C__Blender_Sculpt Owl_Owl.blend].png
Dyntopo ON 2.82:
image.png
Dyntopo OFF 2.90:
image.png

Exact steps for others to reproduce the error
Open a high poly count model
Go to sculpt mode
Notice viewport framerate
Turn on dyntopo, nothing else
Framerate is now much lower
Turn it off and it's back to smooth
(No actual sculpting was done)

**System Information** Operating system: Win10x64 Graphics card: GTX 1080Ti **Blender Version** Broken: 2.82 - 2.90 f96a689b3be2 (much worse in 2.9) Worked: Unknown **Short description of error** When I turn dyntopo on with a high poly count model, the viewport becomes extremely slow, even if I'm not sculpting and just rotating around. As soon as I switch dyntopo off or switch modes, it's butter smooth again. Where I'm looking also seems to have an effect on framerate. Why should a feature related to actual sculpting affect performance when just looking around? Dyntopo ON 2.90: ![2020-04-26 02.13.26 Blender_ [C__Blender_Sculpt Owl_Owl.blend].png](https://archive.blender.org/developer/F8495214/2020-04-26_02.13.26_Blender___C__Blender_Sculpt_Owl_Owl.blend_.png) Dyntopo ON 2.82: ![image.png](https://archive.blender.org/developer/F8495212/image.png) Dyntopo OFF 2.90: ![image.png](https://archive.blender.org/developer/F8495225/image.png) **Exact steps for others to reproduce the error** Open a high poly count model Go to sculpt mode Notice viewport framerate Turn on dyntopo, nothing else Framerate is now much lower Turn it off and it's back to smooth (No actual sculpting was done)
Roman Kornev commented 2020-04-26 01:19:42 +02:00
Author
Copy Link

Added subscriber: @RomanKornev

Added subscriber: @RomanKornev
Ankit Meel commented 2020-04-26 08:28:38 +02:00
Member
Copy Link

Added subscriber: @ankitm

Added subscriber: @ankitm
Ankit Meel commented 2020-04-26 08:28:38 +02:00
Member
Copy Link

Can confirm

Can confirm
Nelson commented 2020-04-26 18:32:16 +02:00
Copy Link

Added subscriber: @NelsonNAS

Added subscriber: @NelsonNAS
Nelson commented 2020-04-26 18:32:16 +02:00
Copy Link

In #76109#917873, @ankitm wrote:
Can confirm

Is it normal to confirm without changing the bug report to "Confirmed"? LOL

> In #76109#917873, @ankitm wrote: > Can confirm Is it normal to confirm without changing the bug report to "Confirmed"? LOL
Ankit Meel commented 2020-04-26 18:37:15 +02:00
Member
Copy Link

Performance regression (with high density meshes, see #73360) isn't always taken as bug report. So letting someone else do it.
Since I was adding project, I thought I should add a comment too.

Performance regression (with high density meshes, see #73360) isn't always taken as bug report. So letting someone else do it. Since I was adding project, I thought I should add a comment too.
Brecht Van Lommel commented 2020-04-28 17:07:38 +02:00
Owner
Copy Link

Added subscriber: @PabloDobarro

Added subscriber: @PabloDobarro
Ankit Meel commented 2020-05-09 13:37:03 +02:00
Member
Copy Link

image.png
^^^ This is causing the perf issue I think. Without Dyntopo, no calls to the sculpt_brush_get_geometry is made & fps is high. CPU usage is also lower .
Dyntopo: image.png
No Dyntopo: image.png

![image.png](https://archive.blender.org/developer/F8522763/image.png) ^^^ This is causing the perf issue I think. Without Dyntopo, no calls to the `sculpt_brush_get_geometry` is made & fps is high. CPU usage is also lower . Dyntopo: ![image.png](https://archive.blender.org/developer/F8522781/image.png) No Dyntopo: ![image.png](https://archive.blender.org/developer/F8522786/image.png)
Ankit Meel commented 2020-05-26 19:49:29 +02:00
Member
Copy Link

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

Changed status from 'Needs Triage' to: 'Confirmed'
Vyacheslav Kobozev commented 2021-01-01 11:38:10 +01:00
Copy Link

Added subscriber: @Vyach

Added subscriber: @Vyach
Vyacheslav Kobozev commented 2021-01-01 11:38:10 +01:00
Copy Link

Poke
Any news? Is it relative to #79146 (Sculpt mode. Performance issues after enable/disable dyntopo with zoom )

Poke Any news? Is it relative to #79146 (Sculpt mode. Performance issues after enable/disable dyntopo with zoom )
Daniel F. R. Gordillo commented 2021-02-05 00:21:03 +01:00
Copy Link

Added subscriber: @DGordillo

Added subscriber: @DGordillo
Daniel F. R. Gordillo commented 2021-02-05 00:21:03 +01:00
Copy Link

Hi. I can confirm I'm having issues with Dyntopo performance on the latest versions (I could sculpt 2M ~ 4M polys easily on my PC and now the same system struggles with barely 400K polys )

My system is: AMD Ryzen Threadripper 1950X 16-Core Processor, Gigabyte X399 AORUS Gaming 7 Motherboard, 32Gb RAM, NVidia GeForce GTX 1080, on Ubuntu 20.04.2 LTS

And, the exact same file has no issues when working with a Intel i7-9700, 16Gb RAM on Windows. So I'm guessing there's some optimization issues with my CPU?? It used to work well a year ago!

Hi. I can confirm I'm having issues with Dyntopo performance on the latest versions (I could sculpt 2M ~ 4M polys easily on my PC and now the same system struggles with barely 400K polys ) My system is: AMD Ryzen Threadripper 1950X 16-Core Processor, Gigabyte X399 AORUS Gaming 7 Motherboard, 32Gb RAM, NVidia GeForce GTX 1080, on Ubuntu 20.04.2 LTS **And, the exact same file has no issues when working with a Intel i7-9700, 16Gb RAM on Windows. So I'm guessing there's some optimization issues with my CPU?? It used to work well a year ago!**
Philipp Oeser removed the
Interest
Sculpt, Paint & Texture
 label 2023-02-10 09:12:34 +01:00
Max Mustermann commented 2023-06-22 19:06:18 +02:00
Copy Link

I can confirm this still happens for me in 3.5.1

Also on an AMD CPU on Linux. When it hangs I see a single CPU core at 100% usage, so maybe Blender is waiting for a single threaded operation here?

Notice how the cursor also becomes slow for a short while after the hiccup is triggered at 40s in the video.

I can confirm this still happens for me in 3.5.1 Also on an AMD CPU on Linux. When it hangs I see a single CPU core at 100% usage, so maybe Blender is waiting for a single threaded operation here? Notice how the cursor also becomes slow for a short while after the hiccup is triggered at 40s in the video.
performance.mkv
2.1 MiB
Architector_4 commented 2024-03-15 17:15:21 +01:00
Copy Link

Experiencing the same thing, on Arch Linux, on an AMD Ryzen 7 7735HS CPU and AMD Radeon RX 7600S GPU, on latest Blender package from official repositories of version 17:4.0.2-21.

It appears that the issue is exacerbated the more I zoom out from a mesh with a sufficient lot of triangles while having Dyntopo enabled, even if all of it is in view either way. Interestingly, stuttering also grows worse if I make my viewport smaller while the same amount of mesh is visible.

Maybe it has to do something with triangles being smaller than a pixel?

It seems like that just maximizing the viewport window and then making it large enough for all visible triangles to be bigger than that perfectly mitigates this issue, but it's not a very handy workflow lol

Uploading a video demonstrating both effects with an icosphere subdivided to 327680 tris in an otherwise basically default scene. Telling perspective change from a sphere is hard, so I tried to make sure there's a camera gizmo visible to the side when demonstrating.

Experiencing the same thing, on Arch Linux, on an AMD Ryzen 7 7735HS CPU and AMD Radeon RX 7600S GPU, on latest Blender package from official repositories of version `17:4.0.2-21`. It appears that the issue is exacerbated the more I **zoom out** from a mesh with a sufficient lot of triangles while having Dyntopo enabled, even if all of it is in view either way. Interestingly, stuttering also grows worse if I make my **viewport smaller** while the same amount of mesh is visible. Maybe it has to do something with triangles being smaller than a pixel? It seems like that just maximizing the viewport window and then making it large enough for all visible triangles to be bigger than that perfectly mitigates this issue, but it's not a very handy workflow lol Uploading a video demonstrating both effects with an icosphere subdivided to 327680 tris in an otherwise basically default scene. Telling perspective change from a sphere is hard, so I tried to make sure there's a camera gizmo visible to the side when demonstrating.
tmp.Dmceunko3M.mp4
2.6 MiB
Architector_4 commented 2024-03-31 14:03:58 +02:00
Copy Link

Strange update: if I use integrated graphics in the AMD Ryzen 7 7735HS APU (i.e. AMD Radeon 680M), even though Blender's performance is generally worse (it's a slower device in general, obviously), the performance on a complex mesh with dyntopo enabled is significantly better (~45FPS), and only about 3x slower than what I get with it disabled on this iGPU (~140FPS)

This appears to be a GPU specific bug or something?

Strange update: if I use integrated graphics in the AMD Ryzen 7 7735HS APU (i.e. AMD Radeon 680M), even though Blender's performance is generally worse (it's a slower device in general, obviously), the performance on a complex mesh with dyntopo enabled is significantly better (~45FPS), and only about 3x slower than what I get with it disabled on this iGPU (~140FPS) This appears to be a GPU specific bug or something?
Max Mustermann commented 2024-04-04 14:12:19 +02:00
Copy Link

I'm having this issue with an AMD CPU and a dedicated AMD GPU on Linux, but Roman has it with an Nvidia GPU on Windows. I don't know if this tells us anything but I think everyone with this error might be on an AMD CPU with a dedicated GPU.

And, the exact same file has no issues when working with a Intel i7-9700

This also makes me think it could be an AMD CPU specific issue.

I'm having this issue with an AMD CPU and a dedicated AMD GPU on Linux, but Roman has it with an Nvidia GPU on Windows. I don't know if this tells us anything but I think everyone with this error might be on an AMD CPU with a dedicated GPU. > And, the exact same file has no issues when working with a Intel i7-9700 This also makes me think it could be an AMD CPU specific issue.
Max Mustermann commented 2024-04-05 15:58:31 +02:00
Copy Link

Maybe it will be fixed by #103346 or #120304.

Maybe it will be fixed by #103346 or #120304.
Sign in to join this conversation.
No Branch/Tag Specified
Branches Tags
Labels
Clear labels   
Interest
Alembic

  
Interest
Animation & Rigging

  
Interest
Asset System
Asset datablocks, libraries, browser and shelf

  
Interest
Audio

  
Interest
Automated Testing

  
Interest
Blender Asset Bundle

  
Interest
BlendFile

  
Interest
Collada

  
Interest
Compatibility
Backward and forward compatibility

  
Interest
Compositing

  
Interest
Core

  
Interest
Cycles

  
Interest
Dependency Graph

  
Interest
Development Management

  
Interest
EEVEE

  
Interest
Freestyle

  
Interest
Geometry Nodes

  
Interest
Grease Pencil

  
Interest
ID Management

  
Interest
Images & Movies

  
Interest
Import Export

  
Interest
Line Art

  
Interest
Masking

  
Interest
Metal

  
Interest
Modeling

  
Interest
Modifiers

  
Interest
Motion Tracking

  
Interest
Nodes & Physics

  
Interest
OpenGL

  
Interest
Overlay

  
Interest
Overrides

  
Interest
Performance

  
Interest
Physics

  
Interest
Pipeline, Assets & IO

  
Interest
Platforms, Builds & Tests

  
Interest
Python API

  
Interest
Render & Cycles

  
Interest
Render Pipeline

  
Interest
Sculpt, Paint & Texture

  
Interest
Text Editor

  
Interest
Translations

  
Interest
Triaging

  
Interest
Undo

  
Interest
USD

  
Interest
User Interface

  
Interest
UV Editing

  
Interest
VFX & Video

  
Interest
Video Sequencer

  
Interest
Viewport & EEVEE

  
Interest
Virtual Reality

  
Interest
Vulkan

  
Interest
Wayland
Wayland windowing on Unix

  
Interest
Workbench

  
Interest: X11

Xorg/X11 windowing

  
Legacy
Asset Browser Project

Archived

  
Legacy
Blender 2.8 Project

Archived

  
Legacy
Milestone 1: Basic, Local Asset Browser

Archived

  
Legacy
OpenGL Error

Archived

  
Meta
Good First Issue

  
Meta
Papercut

  
Meta
Retrospective

  
Meta
Security
Related to security, https://wiki.blender.org/wiki/Process/Vulnerability_Reports

  
Module
Animation & Rigging

  
Module
Core

  
Module
Development Management

  
Module
Grease Pencil

  
Module
Modeling

  
Module
Nodes & Physics

  
Module
Pipeline, Assets & IO

  
Module
Platforms, Builds & Tests

  
Module
Python API

  
Module
Render & Cycles

  
Module
Sculpt, Paint & Texture

  
Module
Triaging

  
Module
User Interface

  
Module
VFX & Video

  
Module
Viewport & EEVEE

  
Platform
FreeBSD

  
Platform
Linux

  
Platform
macOS

  
Platform
Windows

  
Severity
High

  
Severity
Low

  
Severity
Normal

  
Severity
Unbreak Now!

  
Status
Archived

  
Status
Confirmed

  
Status
Duplicate

  
Status
Needs Info from Developers

  
Status
Needs Information from User

  
Status
Needs Triage

  
Status
Resolved

  
Type
Bug

  
Type
Design

  
Type
Known Issue

  
Type
Patch

Archived

  
Type
Report

Archived

  
Type
To Do

No Label
Interest
Alembic
Interest
Animation & Rigging
Interest
Asset System
Interest
Audio
Interest
Automated Testing
Interest
Blender Asset Bundle
Interest
BlendFile
Interest
Collada
Interest
Compatibility
Interest
Compositing
Interest
Core
Interest
Cycles
Interest
Dependency Graph
Interest
Development Management
Interest
EEVEE
Interest
Freestyle
Interest
Geometry Nodes
Interest
Grease Pencil
Interest
ID Management
Interest
Images & Movies
Interest
Import Export
Interest
Line Art
Interest
Masking
Interest
Metal
Interest
Modeling
Interest
Modifiers
Interest
Motion Tracking
Interest
Nodes & Physics
Interest
OpenGL
Interest
Overlay
Interest
Overrides
Interest
Performance
Interest
Physics
Interest
Pipeline, Assets & IO
Interest
Platforms, Builds & Tests
Interest
Python API
Interest
Render & Cycles
Interest
Render Pipeline
Interest
Sculpt, Paint & Texture
Interest
Text Editor
Interest
Translations
Interest
Triaging
Interest
Undo
Interest
USD
Interest
User Interface
Interest
UV Editing
Interest
VFX & Video
Interest
Video Sequencer
Interest
Viewport & EEVEE
Interest
Virtual Reality
Interest
Vulkan
Interest
Wayland
Interest
Workbench
Interest: X11
Legacy
Asset Browser Project
Legacy
Blender 2.8 Project
Legacy
Milestone 1: Basic, Local Asset Browser
Legacy
OpenGL Error
Meta
Good First Issue
Meta
Papercut
Meta
Retrospective
Meta
Security
Module
Animation & Rigging
Module
Core
Module
Development Management
Module
Grease Pencil
Module
Modeling
Module
Nodes & Physics
Module
Pipeline, Assets & IO
Module
Platforms, Builds & Tests
Module
Python API
Module
Render & Cycles
Module
Sculpt, Paint & Texture
Module
Triaging
Module
User Interface
Module
VFX & Video
Module
Viewport & EEVEE
Platform
FreeBSD
Platform
Linux
Platform
macOS
Platform
Windows
Severity
High
Severity
Low
Severity
Normal
Severity
Unbreak Now!
Status
Archived
Status
Confirmed
Status
Duplicate
Status
Needs Info from Developers
Status
Needs Information from User
Status
Needs Triage
Status
Resolved
Type
Bug
Type
Design
Type
Known Issue
Type
Patch
Type
Report
Type
To Do
Milestone
Clear milestone
No items
No Milestone
Projects
Clear projects
No project
Assignees
Clear assignees
No Assignees
8 Participants
Notifications
Due Date
The due date is invalid or out of range. Please use the format 'yyyy-mm-dd'.

No due date set.

Dependencies

No dependencies set.

Reference: blender/blender#76109
No description provided.
Delete Branch "%!s()"

Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?