Modifiers negatively affect other linked mesh modeling performance #77778

New Issue

Karja Krähwald · 2020-06-11T21:13:09+02:00

Karja Krähwald commented

2020-06-11 21:13:09 +02:00

System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 446.14

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-08 15:55, hash: 9f7d84b656
Broken: 2.83.0 (release)

Short description of error
The issue is a bit hard to describe, so sry for that.

Whats happening in my scene is that I use a monkey mesh for example with a setup of modifiers. I link-duplicate it and use a different setup of modifiers on this mesh.
What I see are performance issues while modeling on one of these monkeys, appearently coming from the modifiers of the other monkey.

My feeling is that edit mode is handling/updating modifiers of both meshes at the same time.

Exact steps for others to reproduce the error
LinkedMeshModifierBug.blend
The two monkeys have linked mesh data. Left has Bevel modifier, right has Subsurf.

Steps to see the slowdown:

Left Monkey (Bevel): Go into Edit mode, grab a vertice and move around to check editing speed
Right Monkey (Subsurf): Do again on this one, it should be slower in comparison. (if not noticable on your system, subdivide the mesh manually to increase geometry, keep modifiers)
Left Monkey: Turn "show_viewport" for Bevel modifier off.
Right Monkey: Check editing speed, it should be a lot faster or very smooth.

Problem: The Bevel modifier of the left monkey negatively affects the editing speed of the right monkey.
Notice another (related?) problem: Subsurf isnt even visible active on the right monkey, but slows down regardless.

**System Information** Operating system: Windows-7-6.1.7601-SP1 64 Bits Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 446.14 **Blender Version** Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-08 15:55, hash: `9f7d84b656` Broken: 2.83.0 (release) **Short description of error** The issue is a bit hard to describe, so sry for that. Whats happening in my scene is that I use a monkey mesh for example with a setup of modifiers. I link-duplicate it and use a different setup of modifiers on this mesh. What I see are performance issues while modeling on one of these monkeys, appearently coming from the modifiers of the other monkey. My feeling is that edit mode is handling/updating modifiers of both meshes at the same time. **Exact steps for others to reproduce the error** [LinkedMeshModifierBug.blend](https://archive.blender.org/developer/F8609042/LinkedMeshModifierBug.blend) The two monkeys have linked mesh data. Left has Bevel modifier, right has Subsurf. *Steps to see the slowdown*: 1. Left Monkey (Bevel): Go into Edit mode, grab a vertice and move around to check editing speed 2. Right Monkey (Subsurf): Do again on this one, it should be slower in comparison. (if not noticable on your system, subdivide the mesh manually to increase geometry, keep modifiers) 3. Left Monkey: Turn "show_viewport" for Bevel modifier off. 4. Right Monkey: Check editing speed, it should be a lot faster or very smooth. **Problem**: The Bevel modifier of the left monkey negatively affects the editing speed of the right monkey. Notice another (related?) problem: Subsurf isnt even visible active on the right monkey, but slows down regardless.

Karja Krähwald commented

2020-06-11 21:13:09 +02:00

Added subscriber: @karja

Philipp Oeser commented

2020-06-12 15:06:18 +02:00

Added subscribers: @Sergey, @Jeroen-Bakker, @lichtwerk

Philipp Oeser commented

2020-06-12 15:06:18 +02:00

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

Philipp Oeser commented

2020-06-12 15:06:18 +02:00

I can confirm the issue, quite sure though this has been reported before (but I cannot find it atm.)

@Jeroen-Bakker or @Sergey might know more?

(Before finding the other report, I am unsure how to classify, but will confirm for now)

I can confirm the issue, quite sure though this has been reported before (but I cannot find it atm.) @Jeroen-Bakker or @Sergey might know more? (Before finding the other report, I am unsure how to classify, but will confirm for now)

Matt commented

2020-06-13 16:26:44 +02:00

Added subscriber: @mattli911

Bastien Montagne commented

2020-07-29 11:57:28 +02:00

Added subscriber: @mont29

Bastien Montagne commented

2020-07-29 11:57:28 +02:00

Changed status from 'Confirmed' to: 'Archived'

Bastien Montagne closed this issue

2020-07-29 11:57:28 +02:00

Bastien Montagne self-assigned this 2020-07-29 11:57:28 +02:00

Bastien Montagne commented

2020-07-29 11:57:28 +02:00

Don't see any bug here, it is expected that if a mesh is shared by several objects, editing that mesh will affect all those objects...

Matt commented

2020-07-29 16:15:21 +02:00

In #77778#952581, @lichtwerk wrote:
I can confirm the issue, quite sure though this has been reported before (but I cannot find it atm.)

@Jeroen-Bakker or @Sergey might know more?

(Before finding the other report, I am unsure how to classify, but will confirm for now)

You might be thinking of the issue where even if modifiers are turned off, can impact performance / be re-calculated?

https://developer.blender.org/T73199

> In #77778#952581, @lichtwerk wrote: > I can confirm the issue, quite sure though this has been reported before (but I cannot find it atm.) > > @Jeroen-Bakker or @Sergey might know more? > > (Before finding the other report, I am unsure how to classify, but will confirm for now) You might be thinking of the issue where even if modifiers are turned off, can impact performance / be re-calculated? https://developer.blender.org/T73199

Karja Krähwald commented

2020-08-03 09:36:28 +02:00

@mont29

I am confused in that way that the performance slowdown is coming from the modifiers of another mesh object, and not only from the modifiers of the mesh object I am editing. (Since there is no visible live update of shared meshes under certain (modifier) conditions I assumed the meshes are sort of decoupled while in edit mode, and follow with an update after I switch out.)

Do I see this correct that the modifiers on all shared meshes play a role in performance when editing one of these shared meshes?

@mont29 I am confused in that way that the performance slowdown is coming from the modifiers of another mesh object, and not only from the modifiers of the mesh object I am editing. (Since there is no visible live update of shared meshes under certain (modifier) conditions I assumed the meshes are sort of decoupled while in edit mode, and follow with an update after I switch out.) Do I see this correct that the modifiers on all shared meshes play a role in performance when editing one of these shared meshes?

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Modifiers negatively affect other linked mesh modeling performance #77778