Blender 3.3: New hair system slow on dense mesh #100805

New Issue

Rincewind · 2022-09-04T00:33:39+02:00

Rincewind commented

2022-09-04 00:33:39 +02:00

System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 516.40

Blender Version
Broken: version: 3.3.0 Release Candidate, branch: master, commit date: 2022-09-02 20:48, hash: 831ed297d0
Worked: never, because new feature

Short description of error
The new curve hair system is slow on dense mesh

Exact steps for others to reproduce the error
If you are taking a human mesh (e.g. DAZ Genesis 8 figure) you have easily a base of 300.000 faces.

It seems that new hair system is pretty laggy and slow at these number.

It's working pretty fast with around 120.000 faces, but after most fully rigged humans have much more faces, it would be usefull if the hair system could handle such amount faces.
slow hair example.blend
blender_NULlNHk3He.mp4

**System Information** Operating system: Windows-10-10.0.19044-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 516.40 **Blender Version** Broken: version: 3.3.0 Release Candidate, branch: master, commit date: 2022-09-02 20:48, hash: `831ed297d0` Worked: never, because new feature **Short description of error** The new curve hair system is slow on dense mesh **Exact steps for others to reproduce the error** If you are taking a human mesh (e.g. DAZ Genesis 8 figure) you have easily a base of 300.000 faces. It seems that new hair system is pretty laggy and slow at these number. It's working pretty fast with around 120.000 faces, but after most fully rigged humans have much more faces, it would be usefull if the hair system could handle such amount faces. [slow hair example.blend](https://archive.blender.org/developer/F13456762/slow_hair_example.blend) [blender_NULlNHk3He.mp4](https://archive.blender.org/developer/F13456757/blender_NULlNHk3He.mp4)

Rincewind commented

2022-09-04 00:33:39 +02:00

Added subscriber: @Rincewind3D-1

Steffen Hartmann commented

2022-09-04 11:42:34 +02:00

Added subscriber: @Harti

Sun Kim commented

2022-09-04 23:01:55 +02:00

Added subscriber: @persun

Sun Kim commented

2022-09-04 23:01:55 +02:00

Surface Deform node (automatically added to new hair curves object) costs a lot of performance. Turning it off while sculpting hair will help for the moment.

Pratik Borhade commented

2022-09-05 08:07:33 +02:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2022-09-05 08:16:54 +02:00

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

Pratik Borhade closed this issue

2022-09-05 08:16:54 +02:00

Pratik Borhade commented

2022-09-05 08:16:54 +02:00

Added subscriber: @JacquesLucke

Pratik Borhade commented

2022-09-05 08:16:54 +02:00

Thanks for the report. While we do continue to work on improving performance in general, potential performance improvements are not handled as bug reports.
To improve performance, consider using less complex geometry, simpler shaders and smaller textures.
@JacquesLucke , please reopen the report if performance drop is not expected here.

Thanks for the report. While we do continue to work on improving performance in general, potential performance improvements are not handled as bug reports. To improve performance, consider using less complex geometry, simpler shaders and smaller textures. @JacquesLucke , please reopen the report if performance drop is not expected here.

Rincewind referenced this issue

2023-04-08 15:54:28 +02:00

Particle system removal #105316

Iliya Katushenock commented

2023-04-08 16:38:19 +02:00

Of the Surface Deform node's 28.6 s running time, creating a helper structure for inverse uv sampling takes 26.0 s.
I'll reopen this as a real confirmed issue, but close it as it is a limitation of the current implementation. I have opened an issue related to fixing this by changing the inverse uv sampling structure: #106713
You can manually subscribe to #106713 to be notified of news from there.

Of the `Surface Deform` node's 28.6 s running time, creating a helper structure for inverse uv sampling takes 26.0 s. I'll reopen this as a real confirmed issue, but close it as it is a limitation of the current implementation. I have opened an issue related to fixing this by changing the inverse uv sampling structure: https://projects.blender.org/blender/blender/issues/106713 You can manually subscribe to https://projects.blender.org/blender/blender/issues/106713 to be notified of news from there.

👍 1

Iliya Katushenock reopened this issue

2023-04-08 16:38:22 +02:00

Blender Bot added

and removed

labels 2023-04-08 16:38:23 +02:00

Iliya Katushenock added

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