Geometry nodes. Low performance case with instancing #94733

New Issue

Vyacheslav Kobozev · 2022-01-08T05:37:08+01:00

2022-01-08 05:37:08 +01:00

System Information
Operating system: Windows-8.1-6.3.9600-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.12

Blender Version
Broken: version: 3.1.0 Alpha, branch: master, commit date: 2022-01-05 22:15, hash: 1d9bac7d92

Here is the file
untitled.blend
Performance fall down, when I use checkbox «As instance» for object, that instanced + object have disabled SubSurf modifier with zero levels.
Try to delete modifier or uncheck checkbox.

2022-01-08_07-31-25.mp4

Also realized instances cause slow movement of initial mesh. I suppose, initial mesh should be «frozen» and cached before pass to GN and changing its properties, thad do not influence to GN-tree shouldnt cause performance drop.
untitled1.blend

2022-01-08_07-42-15.mp4

**System Information** Operating system: Windows-8.1-6.3.9600-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.12 **Blender Version** Broken: version: 3.1.0 Alpha, branch: master, commit date: 2022-01-05 22:15, hash: `1d9bac7d92` Here is the file [untitled.blend](https://archive.blender.org/developer/F12793852/untitled.blend) Performance fall down, when I use checkbox «As instance» for object, that instanced + object have disabled SubSurf modifier with zero levels. Try to delete modifier or uncheck checkbox. [2022-01-08_07-31-25.mp4](https://archive.blender.org/developer/F12793854/2022-01-08_07-31-25.mp4) Also realized instances cause slow movement of initial mesh. I suppose, initial mesh should be «frozen» and cached before pass to GN and changing it`s properties, thad do not influence to GN-tree shouldn`t cause performance drop. [untitled1.blend](https://archive.blender.org/developer/F12793866/untitled1.blend) [2022-01-08_07-42-15.mp4](https://archive.blender.org/developer/F12793859/2022-01-08_07-42-15.mp4)

Vyacheslav Kobozev commented

2022-01-08 05:37:08 +01:00

Added subscriber: @Vyach

Vyacheslav Kobozev changed title from ~~Geometry nodes. Low viewport performance case~~ to Geometry nodes. Low performance case

2022-01-08 05:48:15 +01:00

Vyacheslav Kobozev changed title from ~~Geometry nodes. Low performance case~~ to Geometry nodes. Low performance case with instancing

2022-01-08 05:48:43 +01:00

Richard Antalik commented

2022-01-08 06:23:52 +01:00

Added subscriber: @iss

Richard Antalik commented

2022-01-08 06:23:52 +01:00

Nut quite sure if I understand what is the role of subdivision modifier - is there no lag if this is any different modifier? reminds me of #94671, in both cases I can't reproduce this issue though.

Also I am not able to play second video - it doesn't load in browser and does not have sound in VLC.

Nut quite sure if I understand what is the role of subdivision modifier - is there no lag if this is any different modifier? reminds me of #94671, in both cases I can't reproduce this issue though. Also I am not able to play second video - it doesn't load in browser and does not have sound in VLC.

Vyacheslav Kobozev commented

2022-01-08 07:58:12 +01:00

In #94733#1284799, @iss wrote:
Nut quite sure if I understand what is the role of subdivision modifier - is there no lag if this is any different modifier? reminds me of #94671, in both cases I can't reproduce this issue though.

Tested. Even heavier bevel modifier do not make performance impact if disabled. Remesh do not drop fps too, when disabled. So not any modifier.
And Subsurf may be not the last modifier in stack.

> In #94733#1284799, @iss wrote: > Nut quite sure if I understand what is the role of subdivision modifier - is there no lag if this is any different modifier? reminds me of #94671, in both cases I can't reproduce this issue though. Tested. Even heavier bevel modifier do not make performance impact if disabled. Remesh do not drop fps too, when disabled. So not any modifier. And Subsurf may be not the last modifier in stack.

Richard Antalik commented

2022-01-08 08:35:49 +01:00

Interesting. Now I was able to play second video too, this seems to be different issue, because I am able to reproduce that. Not sure if that is bug though, Will have to look how realize instances works. but it doesn't seem to be executing modifier for each instance.

Vyacheslav Kobozev commented

2022-01-08 10:17:53 +01:00

In #94733#1284865, @iss wrote:
Interesting. Now I was able to play second video too, this seems to be different issue, because I am able to reproduce that. Not sure if that is bug though, Will have to look how realize instances works. but it doesn't seem to be executing modifier for each instance.

For the second case:

no matter what modifier is
even without modifier, when I move instanced Suzanne, it have a bit lower performance
applied modifier, the same effect, so only polycount matters.
So moving original changes something and call the tree again, perhaps...

> In #94733#1284865, @iss wrote: > Interesting. Now I was able to play second video too, this seems to be different issue, because I am able to reproduce that. Not sure if that is bug though, Will have to look how realize instances works. but it doesn't seem to be executing modifier for each instance. For the second case: 1) no matter what modifier is 2) even without modifier, when I move instanced Suzanne, it have a bit lower performance 3) applied modifier, the same effect, so only polycount matters. So moving original changes something and call the tree again, perhaps...

Vyacheslav Kobozev commented

2022-01-09 01:45:39 +01:00

Only 3.1 have performance issues. Even with old nodes.
radial low perf.blend
2022-01-09_03-41-50.mp4

Only 3.1 have performance issues. Even with old nodes. [radial low perf.blend](https://archive.blender.org/developer/F12796792/radial_low_perf.blend) [2022-01-09_03-41-50.mp4](https://archive.blender.org/developer/F12796788/2022-01-09_03-41-50.mp4)

Richard Antalik commented

2022-01-11 03:29:36 +01:00

Added subscriber: @HooglyBoogly

Richard Antalik commented

2022-01-11 03:29:36 +01:00

@HooglyBoogly Do you know if this works as expected?

Hans Goudey commented

2022-01-11 20:56:31 +01:00

Hmm, loading the radial low perf.blend file, it seems to have expected performance for me. Can you still reproduce this, I think 5560f32447 might have made an improvement in this area.

Hmm, loading the `radial low perf.blend` file, it seems to have expected performance for me. Can you still reproduce this, I think 5560f32447 might have made an improvement in this area.

Vyacheslav Kobozev commented

2022-01-12 00:28:52 +01:00

In #94733#1286547, @HooglyBoogly wrote:
Hmm, loading the radial low perf.blend file, it seems to have expected performance for me. Can you still reproduce this, I think 5560f32447 might have made an improvement in this area.

radial low perf.blend now works fine for me in the latest build 3.1.0 Alpha, 922ae55a16, 2022-01-10 22:45

untitled1.blend shows same issue, until instances realized. When i mute Realize node, it starts to work well.

Also, disabled subdiv modifier do not influence performance animore with this file.

> In #94733#1286547, @HooglyBoogly wrote: > Hmm, loading the `radial low perf.blend` file, it seems to have expected performance for me. Can you still reproduce this, I think 5560f32447 might have made an improvement in this area. *radial low perf.blend* now works fine for me in the latest build 3.1.0 Alpha, 922ae55a16a9, 2022-01-10 22:45 *untitled1.blend* shows same issue, until instances realized. When i mute Realize node, it starts to work well. Also, disabled subdiv modifier do not influence performance animore with this file.

Hans Goudey commented

2022-01-17 06:38:35 +01:00

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

Hans Goudey closed this issue

2022-01-17 06:38:35 +01:00

Hans Goudey self-assigned this 2022-01-17 06:38:35 +01:00

Hans Goudey commented

2022-01-17 06:38:35 +01:00

Thanks for checking. I'm pretty sure this is the problem with bounding boxes being recalculated for geometry instances, because there is no place to cache them at the moment. This should be improved, but there's an existing task for it, #92963. So I'll close this report. Thanks.

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

Geometry nodes. Low performance case with instancing #94733