Using subdiv modifier affects normal baking performace of all objects in scene #60428

New Issue

Jonathan Lampel · 2019-01-11T21:47:05+01:00

Jonathan Lampel commented

2019-01-11 21:47:05 +01:00

System Information
Operating system: Windows 10
Graphics card: GTX 1080Ti

Blender Version
Broken: version: 2.83 (sub 10), branch: master, commit date: 2020-03-19 11:11, hash: cc516b82ef
Worked: Never (2.8+)

Exact steps for others to reproduce the error
#60428.blend

Open file
Press bake, watch memory usage

Remove subsurf modifier on `door_frame_low.001` object and repeat step 2

Baking is much quicker and doesn't require too much RAM

**System Information** Operating system: Windows 10 Graphics card: GTX 1080Ti **Blender Version** Broken: version: 2.83 (sub 10), branch: master, commit date: 2020-03-19 11:11, hash: `cc516b82ef` Worked: Never (2.8+) **Exact steps for others to reproduce the error** [#60428.blend](https://archive.blender.org/developer/F8416619/T60428.blend) - Open file - Press bake, watch memory usage # Remove subsurf modifier on `door_frame_low.001` object and repeat step 2 Baking is much quicker and doesn't require too much RAM

Jonathan Lampel commented

2019-01-11 21:47:05 +01:00

Added subscriber: @JonathanLampel-4

Jonathan Lampel changed title from ~~Baking normals many times freezes computer~~ to Baking memory usage massively increases over time

2019-01-14 17:48:06 +01:00

Sebastian Parborg commented

2019-01-28 10:56:10 +01:00

Added subscriber: @ZedDB

Dalai Felinto was assigned by Sebastian Parborg

2019-01-28 10:56:10 +01:00

Sebastian Parborg commented

2019-01-28 10:56:10 +01:00

There is something weird going in in there for certain. If I delete the door_high and door_low collections the baking is fine.

However, as those objects shouldn't affect the baking this is a bit odd.

There is something weird going in in there for certain. If I delete the door_high and door_low collections the baking is fine. However, as those objects shouldn't affect the baking this is a bit odd.

Leigh Harborne commented

2019-03-04 23:27:18 +01:00

Added subscriber: @LeighAlexH

Leigh Harborne commented

2019-03-04 23:27:18 +01:00

I'm currently following Jonathan's door tutorial and experiencing the exact same issue in 2.80.45. 42.25GB memory usage and about half an hour for a very simple bake.

Dalai Felinto removed their assignment 2019-12-23 16:35:24 +01:00

Dalai Felinto commented

2019-12-23 16:35:24 +01:00

Added subscriber: @dfelinto

Sybren A. Stüvel commented

2020-02-10 16:03:42 +01:00

Added subscriber: @dr.sybren

Sybren A. Stüvel commented

2020-02-10 16:03:42 +01:00

Changed status from 'Confirmed' to: 'Needs User Info'

Sybren A. Stüvel commented

2020-02-10 16:03:42 +01:00

I can't reproduce this issue with the example file. When I click 'bake' I get this error:

Uninitialized image "cube normal" from object "cube_low"

Adding a new image and selecting that in the 'cube normal' node fixes that, though. I've updated the blend file in the task description for this.

I can also confirm the long duration (waited minutes, is still at 0%) and the memory usage. I cancelled after Blender allocating 32 GB.

Disabling the two hidden collections indeed works around this.

@JonathanLampel-4 can you do more digging? If you can, please remove objects one by one to see which one is influencing this behaviour.

I can't reproduce this issue with the example file. When I click 'bake' I get this error: > Uninitialized image "cube normal" from object "cube_low" Adding a new image and selecting that in the 'cube normal' node fixes that, though. I've updated the blend file in the task description for this. I can also confirm the long duration (waited minutes, is still at 0%) and the memory usage. I cancelled after Blender allocating 32 GB. Disabling the two hidden collections indeed works around this. @JonathanLampel-4 can you do more digging? If you can, please remove objects one by one to see which one is influencing this behaviour.

Jonathan Lampel commented

2020-02-11 01:40:02 +01:00

Sure thing! Thanks for updating the file for 2.81. Here's what I've found in an afternoon of investigating.

There is no one object that causes the slowdown - each object seems to contribute a little bit, but some disproportionately more than others.

Turning on Simplify and setting Max Subdiv to 0 for Render helps substantially. However, it can't be just the subdiv modifier since some objects with no subdiv modifier still cause a smaller but noticeable spike in memory.

Turning on Simplify and setting Max Subdiv to 0 speeds things up even for the problematic objects that don't have a Subdiv modifier, which is very strange.

The relationship between number of problematic objects and the size of the memory spike is not linear. I would have assumed that including ten problematic objects would result in a much bigger spike than including only one problematic object, but that doesn't seem to be the case.

Here's an updated file that has all the objects organized by how much they contribute to the memory spike. It may be useful to know that all of these objects have been part of several bakes before in this file's history. Totally new objects, even very dense ones, don't seem to influence the bake whatsoever.

baking-bug_02.blend

I really appreciate you looking into this one! This type of major slowdown has happened to me on every project in the past year and a half in which I need to bake normals for a lot of objects, and it doesn't show up until well into production. If there's any other digging you would find useful, just let me know.

Sure thing! Thanks for updating the file for 2.81. Here's what I've found in an afternoon of investigating. There is no one object that causes the slowdown - each object seems to contribute a little bit, but some disproportionately more than others. Turning on Simplify and setting Max Subdiv to 0 for Render helps substantially. However, it can't be just the subdiv modifier since some objects with no subdiv modifier still cause a smaller but noticeable spike in memory. Turning on Simplify and setting Max Subdiv to 0 speeds things up even for the problematic objects that don't have a Subdiv modifier, which is very strange. The relationship between number of problematic objects and the size of the memory spike is not linear. I would have assumed that including ten problematic objects would result in a much bigger spike than including only one problematic object, but that doesn't seem to be the case. Here's an updated file that has all the objects organized by how much they contribute to the memory spike. It may be useful to know that all of these objects have been part of several bakes before in this file's history. Totally new objects, even very dense ones, don't seem to influence the bake whatsoever. [baking-bug_02.blend](https://archive.blender.org/developer/F8333978/baking-bug_02.blend) I really appreciate you looking into this one! This type of major slowdown has happened to me on every project in the past year and a half in which I need to bake normals for a lot of objects, and it doesn't show up until well into production. If there's any other digging you would find useful, just let me know.

Aaron Carlisle commented

2020-02-18 19:32:33 +01:00

Changed status from 'Needs User Info' to: 'Needs Developer To Reproduce'

Ankit Meel commented

2020-03-18 18:43:01 +01:00

Added subscriber: @ankitm

Ankit Meel commented

2020-03-18 18:43:01 +01:00

If the memory trace (Instruments.app) helps. This is for the ~800MB jump in allocations.

This is for ~500MB jump at a later point.

If the memory trace (Instruments.app) helps. This is for the ~800MB jump in allocations. ![Screenshot 2020-03-18 at 23.12.05.png](https://archive.blender.org/developer/F8414280/Screenshot_2020-03-18_at_23.12.05.png) This is for ~500MB jump at a later point. ![Screenshot 2020-03-18 at 23.11.41.png](https://archive.blender.org/developer/F8414279/Screenshot_2020-03-18_at_23.11.41.png)

Richard Antalik changed title from ~~Baking memory usage massively increases over time~~ to Using subdiv modifier affects normal baking performace of all objects in scene

2020-03-19 22:08:09 +01:00

Richard Antalik commented

2020-03-19 22:08:09 +01:00

Changed status from 'Needs Developer To Reproduce' to: 'Confirmed'

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Using subdiv modifier affects normal baking performace of all objects in scene #60428

Remove subsurf modifier on door_frame_low.001 object and repeat step 2

Remove subsurf modifier on `door_frame_low.001` object and repeat step 2