Multires disp bake doesn't smooth UV #87725

New Issue

Gurra · 2021-04-22T20:33:31+02:00

Gurra commented

2021-04-22 20:33:31 +02:00

System Information
Operating system: Windows 10
Graphics card: RTX 3060ti

Blender Version
Broken: 2.92, 02948a2cab
Worked: Don't know

Short description of error
When baking a multires sculpt it will bake the disp towards a subdivided mesh but not a smoothed UV.

Exact steps for others to reproduce the error
Guess the best way is just to download my attached .blend, make sure the image texture is selected, that the Level Viewport on the multires modifier is at 0 and use the bake under Render properties. The resulting texture should not have this clear square in the middle as in my example picture below, but it do because the UV ain't getting smoothed. I did make sure that I had UV smooth enabled when I first subdivided the mesh.
Also added an example from what happens when I do this on a real project. This is baked and then applied to a subdivded mesh, look at the wrinkles below the eye.
multires_bug.blend

**System Information** Operating system: Windows 10 Graphics card: RTX 3060ti **Blender Version** Broken: 2.92, 02948a2cab44 Worked: Don't know **Short description of error** When baking a multires sculpt it will bake the disp towards a subdivided mesh but not a smoothed UV. **Exact steps for others to reproduce the error** Guess the best way is just to download my attached .blend, make sure the image texture is selected, that the Level Viewport on the multires modifier is at 0 and use the bake under Render properties. The resulting texture should not have this clear square in the middle as in my example picture below, but it do because the UV ain't getting smoothed. I did make sure that I had UV smooth enabled when I first subdivided the mesh. Also added an example from what happens when I do this on a real project. This is baked and then applied to a subdivded mesh, look at the wrinkles below the eye. [multires_bug.blend](https://archive.blender.org/developer/F10032833/multires_bug.blend) ![multiresbug.jpg](https://archive.blender.org/developer/F10032831/multiresbug.jpg) ![multiresbugfrog.jpg](https://archive.blender.org/developer/F10032847/multiresbugfrog.jpg)

Gurra commented

2021-04-22 20:33:31 +02:00

Added subscriber: @Gurra

Philipp Oeser commented

2021-07-13 13:55:14 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-07-13 13:55:14 +02:00

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

Philipp Oeser commented

2021-07-13 13:55:14 +02:00

Not totally sure I understand correctly.
If the resulting image is used in a displace modifier, the result seems to be expected? (cannot spot any artifacts here):

multires_displace_from_bake_result.blend

Does this not work for you?
Or could you explain in more detail where the result is not acting as expected?

Not totally sure I understand correctly. If the resulting image is used in a displace modifier, the result seems to be expected? (cannot spot any artifacts here): ![image.png](https://archive.blender.org/developer/F10223112/image.png) [multires_displace_from_bake_result.blend](https://archive.blender.org/developer/F10223114/multires_displace_from_bake_result.blend) Does this not work for you? Or could you explain in more detail where the result is not acting as expected?

Philipp Oeser commented

2021-07-22 17:42:03 +02:00

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

Philipp Oeser closed this issue

2021-07-22 17:42:03 +02:00

Philipp Oeser commented

2021-07-22 17:42:03 +02:00

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed.

Thanks again for the report. If the problem persists please open a new report with the required information.

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed. Thanks again for the report. If the problem persists please open a new report with the required information.

Gurra commented

2021-07-23 15:50:40 +02:00

I have been away and hadn't had time to check this. And giving me only a week to answer after having to wait three months for a reply myself is a bit unfair tbh :)

Anyways, if you gonna use a displace modifier you have to turn of the multires first and also add a subdivision modifier instead. The coordinate on that displace modifier should also be set to UV. This is what I get when doing this

If I then set the subd modifiers UV smooth to "none" it will look correct. This could work even thou it's a backwards way and weird way to do it imo, but if I also would like to add a tileable texture to it that will deform really ugly. So in short, the multires bake is bugged, or it needs to be added an "smooth uv" option (that should be the default).
multires_displace_from_bake_result_2.blend

Also added a brick texture in that blend-file that you can try and see how bad it looks when the UV smooth is set to "none" :)

I have been away and hadn't had time to check this. And giving me only a week to answer after having to wait three months for a reply myself is a bit unfair tbh :) Anyways, if you gonna use a displace modifier you have to turn of the multires first and also add a subdivision modifier instead. The coordinate on that displace modifier should also be set to UV. This is what I get when doing this ![multires_displace_modifier.jpg](https://archive.blender.org/developer/F10234950/multires_displace_modifier.jpg) If I then set the subd modifiers UV smooth to "none" it will look correct. This could work even thou it's a backwards way and weird way to do it imo, but if I also would like to add a tileable texture to it that will deform really ugly. So in short, the multires bake is bugged, or it needs to be added an "smooth uv" option (that should be the default). [multires_displace_from_bake_result_2.blend](https://archive.blender.org/developer/F10234961/multires_displace_from_bake_result_2.blend) Also added a brick texture in that blend-file that you can try and see how bad it looks when the UV smooth is set to "none" :)

Philipp Oeser commented

2021-07-23 16:16:43 +02:00

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

Philipp Oeser reopened this issue

2021-07-23 16:16:43 +02:00

Philipp Oeser commented

2021-09-24 15:56:39 +02:00

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

Philipp Oeser commented

2021-09-24 15:56:39 +02:00

Sorry this took so long to answer.

Tbh, I am probably not familiar enough with the mutires workflow to properly triage this report.
If you like, you could hold my hand here and clarify the following:

This could work even thou it's a backwards way and weird way to do it imo

From you original file multires_bug.blend how would you then use the resulting baked image in your workflow (as opposed to mine)?
Can you share the file for this? thx in advance.
(will also try to gather info from others being more familiar with this area of blender)

Sorry this took so long to answer. Tbh, I am probably not familiar enough with the mutires workflow to properly triage this report. If you like, you could hold my hand here and clarify the following: > This could work even thou it's a backwards way and weird way to do it imo From you original file `multires_bug.blend` how would you then use the resulting baked image in your workflow (as opposed to mine)? Can you share the file for this? thx in advance. (will also try to gather info from others being more familiar with this area of blender)

Gurra commented

2021-10-03 13:49:42 +02:00

If I'd use the resulting baked unsmooth image with a Subdivision modifier with UV Smooth to "None". One of the flaws with this is that when setting that to none and then adding a texture on that will make that texture badly stretched.

I managed to somewhat (didn't get it to match 100%) get my test mesh into Mudbox to extract a displacement to show how it should look. Mudbox with smooth UVs to the left and Blender with unsmooth UVs to the right.

I've also included both textures in this blend file :)
multires_bug_002.blend

If I'd use the resulting baked unsmooth image with a Subdivision modifier with UV Smooth to "None". One of the flaws with this is that when setting that to none and then adding a texture on that will make that texture badly stretched. ![multires_bug_bricks.jpg](https://archive.blender.org/developer/F10746908/multires_bug_bricks.jpg) I managed to somewhat (didn't get it to match 100%) get my test mesh into Mudbox to extract a displacement to show how it should look. Mudbox with smooth UVs to the left and Blender with unsmooth UVs to the right. ![multiresbug_bake_mud_compare.png](https://archive.blender.org/developer/F10747044/multiresbug_bake_mud_compare.png) I've also included both textures in this blend file :) [multires_bug_002.blend](https://archive.blender.org/developer/F10747474/multires_bug_002.blend)

Philipp Oeser commented

2021-10-14 10:17:05 +02:00

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

Gurra commented

2022-02-09 11:08:03 +01:00

Don't know what's happening with this, not much I guess, but I still find it quite annoying that it doesn't smooth the UV when I bake a dispalcement. So I tried making a rightclickselect suggestion but that's not going so fast either. You might want to check it out for a suggestion on how I think the fix should look :)
https://blender.community/c/rightclickselect/Eq5k/

Don't know what's happening with this, not much I guess, but I still find it quite annoying that it doesn't smooth the UV when I bake a dispalcement. So I tried making a rightclickselect suggestion but that's not going so fast either. You might want to check it out for a suggestion on how I think the fix should look :) https://blender.community/c/rightclickselect/Eq5k/

Philipp Oeser commented

2022-02-09 13:53:47 +01:00

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

Philipp Oeser commented

2022-02-09 13:53:47 +01:00

Added subscriber: @brecht

Philipp Oeser commented

2022-02-09 13:53:47 +01:00

Sorry again this took so long to answer.

It might be a feature request, would still like @brecht to share some insight here

Sorry again this took so long to answer. It might be a feature request, would still like @brecht to share some insight here

Gurra commented

2022-12-04 20:32:21 +01:00

Bump?

Julien Kaspar commented

2023-01-25 15:22:42 +01:00

Added subscriber: @JulienKaspar

Julien Kaspar commented

2023-01-25 15:22:42 +01:00

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

Julien Kaspar commented

2023-01-25 15:22:42 +01:00

I tested the current issues more and made an additonal bug report with #104134.

The fact that UV smoothing is not supported for "Bake from Multires" is a big issue and not at all communicated in the UI.
I'll confirm the bug and talk with some devs on how this and similar issues can be prioritized in the near future, so the current baking features produce usable results.

I tested the current issues more and made an additonal bug report with #104134. The fact that UV smoothing is not supported for "Bake from Multires" is a big issue and not at all communicated in the UI. I'll confirm the bug and talk with some devs on how this and similar issues can be prioritized in the near future, so the current baking features produce usable results.

Philipp Oeser commented

2023-01-26 09:47:53 +01:00

Thx @JulienKaspar ! : I should have reached out to you earlier

Gurra commented

2023-01-26 12:41:31 +01:00

Ah nice one @JulienKaspar , had almost given up on this bug :)

Philipp Oeser removed the

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Multires disp bake doesn't smooth UV #87725