Baking AO from Multires error and lack of option #84477

New Issue

Zaid · 2021-01-07T01:34:36+01:00

Zaid commented

2021-01-07 01:34:36 +01:00

System Information
Operating system: Windows 10
Graphics card: Zotac GTX 1050 ti OC 4GB

Blender Version
Broken: ( since blender-2.80.0-git.27adc4aa3347-windows64)
current version :blender-2.92.0-5424b4821d28-windows64

Short description of error

there is no AO baking in Bake from Multires option
but it still bakes AO from Multires if I uncheck the box of Bake from Multires

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).

subdivide the cube 3 times
apply subdivision
apply multires modifer 3 times
sculpt a bunch of stuff
leave sculpt mode
apply material
using cycles bake color image texture AO

and uploaded a video file to show the process step by step
PS : please make the option avalible to bake an AO map from Multires modifier, my workflow depends on it and it is super useful, don't just remove it, am still using Blender 2.79 for that option alone.2021-01-07 08-17-37.mp4

Error Report.blend

**System Information** Operating system: Windows 10 Graphics card: Zotac GTX 1050 ti OC 4GB **Blender Version** Broken: ( since blender-2.80.0-git.27adc4aa3347-windows64) current version :blender-2.92.0-5424b4821d28-windows64 **Short description of error** there is no AO baking in Bake from Multires option but it still bakes AO from Multires if I uncheck the box of Bake from Multires **Exact steps for others to reproduce the error** Based on the default startup or an attached .blend file (as simple as possible). - subdivide the cube 3 times - apply subdivision - apply multires modifer 3 times - sculpt a bunch of stuff - leave sculpt mode - apply material - using cycles bake color image texture AO and uploaded a video file to show the process step by step PS : please make the option avalible to bake an AO map from Multires modifier, my workflow depends on it and it is super useful, don't just remove it, am still using Blender 2.79 for that option alone.[2021-01-07 08-17-37.mp4](https://archive.blender.org/developer/F9553639/2021-01-07_08-17-37.mp4) [Error Report.blend](https://archive.blender.org/developer/F9553637/Error_Report.blend)

Zaid commented

2021-01-07 01:34:36 +01:00

Added subscriber: @SkeletalRaven

Philipp Oeser commented

2021-01-07 10:55:14 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-01-07 10:55:14 +01:00

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

Philipp Oeser commented

2021-01-07 10:55:14 +01:00

Isnt this because Multires is still set to the higher level for rendering in the modifier?
It is the same for normals, you dont necessarily need the Bake From Multires, it works without (but uses more memory etc.)

Relevant commits:

Note that in 2.79, this multires AO optimization was for Blender Internal renderer, will check if Cycles supports any kind of multires optimization for AO (if there isnt, then this is not a bug)

Isnt this because Multires is still set to the higher level for rendering in the modifier? It is the same for normals, you dont necessarily **need** the `Bake From Multires`, it works without (but uses more memory etc.) Relevant commits: - a1c22262fe - 6571713ddb - 51b796ff15 Note that in 2.79, this multires AO optimization was for `Blender Internal` renderer, will check if Cycles supports any kind of multires optimization for AO (if there isnt, then this is not a bug)

Philipp Oeser commented

2021-01-07 12:59:01 +01:00

Added subscriber: @brecht

Philipp Oeser commented

2021-01-07 12:59:01 +01:00

From what I can tell, AO baking is not supported with the multires baker optimizations in Cycles, so you are left with is the "regular" baking [in which you would e.g. see other objects as well]

It has been noted as a TODO in 51b796ff15, see https://developer.blender.org/diffusion/B/browse/master/source/blender/render/intern/multires_bake.c$1428

/* TODO: restore ambient occlusion baking support. */

Soooo, this is not a bug, @brecht : do you want to keep this as a TODO task? Could not find this mentioned anywhere...
If not, this could be closed.

From what I can tell, AO baking is not supported with the multires baker optimizations in Cycles, so you are left with is the "regular" baking [in which you would e.g. see other objects as well] It has been noted as a TODO in 51b796ff15, see https://developer.blender.org/diffusion/B/browse/master/source/blender/render/intern/multires_bake.c$1428 > /* TODO: restore ambient occlusion baking support. */ Soooo, this is not a bug, @brecht : do you want to keep this as a TODO task? Could not find this mentioned anywhere... If not, this could be closed.

Brecht Van Lommel commented

2021-01-11 18:07:56 +01:00

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

Brecht Van Lommel closed this issue

2021-01-11 18:07:56 +01:00

Brecht Van Lommel commented

2021-01-11 18:07:56 +01:00

I have no immediate plans to bring back multires AO baking.

I'm not sure that it is an important optimization. We do intend to change the baking workflow so that it's easier to bake AO without having to switch that Bake From Multires option.

I have no immediate plans to bring back multires AO baking. I'm not sure that it is an important optimization. We do intend to change the baking workflow so that it's easier to bake AO without having to switch that Bake From Multires option.

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Baking AO from Multires error and lack of option #84477