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Regression: Uv Unpacking creates diagonal pieces instead of straight ones. #109906

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opened 2023-07-10 13:41:59 +02:00 by Joanna Vetulani · 9 comments
Joanna Vetulani commented 2023-07-10 13:41:59 +02:00
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System Information
Operating system: Linux-5.15.0-76-generic-x86_64-with-glibc2.35 64 Bits, X11 UI
Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 515.105.01

Blender Version
Broken: version: 3.6.0, branch: blender-v3.6-release, commit date: 2023-06-27 08:08, hash: c7fc78b81ecb
Worked: 3.5 and previous
Caused by 3ea060860a

Short description of error
Unwrapping acts like packing and tries to fit the island in the texture area instead of trying to maintain orientation like before.
This is making working with texture atlases and trimsheets extremely annoying requiring my team to rotate these pieces and flatten out the edges cause they're not just rotated at a 45 degree angle or a 90 degree one as they used to sometimes be. There doesn't seem to be any option to turn this new behaviour off in the unwrapping options panel...

It's gotten to the point where people are ditching 3.6 altogether because it's hampering work, which is why we're assuming it's a bug with the amount of additional work it's created.

Steps to Reproduce

  • Open attached file
  • Call UV unwrap for select quad

UVRotation.blend

3.5 3.6
Image image
**System Information** Operating system: Linux-5.15.0-76-generic-x86_64-with-glibc2.35 64 Bits, X11 UI Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 515.105.01 **Blender Version** Broken: version: 3.6.0, branch: blender-v3.6-release, commit date: 2023-06-27 08:08, hash: `c7fc78b81ecb` Worked: 3.5 and previous Caused by 3ea060860a4dd758dfeaee5c63fb4aa4a8a0b82b **Short description of error** Unwrapping acts like packing and tries to fit the island in the texture area instead of trying to maintain orientation like before. This is making working with texture atlases and trimsheets extremely annoying requiring my team to rotate these pieces and flatten out the edges cause they're not just rotated at a 45 degree angle or a 90 degree one as they used to sometimes be. There doesn't seem to be any option to turn this new behaviour off in the unwrapping options panel... It's gotten to the point where people are ditching 3.6 altogether because it's hampering work, which is why we're assuming it's a bug with the amount of additional work it's created. **Steps to Reproduce** - Open attached file - Call UV unwrap for select quad [UVRotation.blend](https://projects.blender.org/attachments/1c583617-a3d3-4a3f-86b0-5030b4b630b1) | 3.5 | 3.6 | | -------- | -------- | | ![Image](https://projects.blender.org/attachments/fdb32df4-2c9c-480c-8073-681572cd8f31) | ![image](https://projects.blender.org/attachments/ed5f9194-0eda-4793-8315-b5c36f809e0e) |
PackingBug.png
436 KiB
PackingBug.png
Joanna Vetulani added the
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 labels 2023-07-10 13:42:00 +02:00
Joanna Vetulani commented 2023-07-10 13:51:27 +02:00
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To be clear, the expected behaviour here is that the unwrapped piece on the right, when pressing U - Unwrap, be straight in the UV space and at worst rotated at 90 degree angles instead of being diagonal like that.

To be clear, the expected behaviour here is that the unwrapped piece on the right, when pressing U - Unwrap, be straight in the UV space and at worst rotated at 90 degree angles instead of being diagonal like that.
Pratik Borhade commented 2023-07-11 07:32:15 +02:00
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Hi, thanks for the report. Could you share .blend file and steps to redo the issue locally?
cc @Chris_Blackbourn

Hi, thanks for the report. Could you share .blend file and steps to redo the issue locally? cc @Chris_Blackbourn
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 labels 2023-07-11 07:32:23 +02:00
Chris Blackbourn commented 2023-07-11 12:18:43 +02:00
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We can potentially add options to the Unwrap operator to help with this. It will probably make the most sense to bundle with #78395

In the interim, have you maybe tried "UV > Align Rotation > Auto" from the UV Editor menu?

We can potentially add options to the Unwrap operator to help with this. It will probably make the most sense to bundle with https://projects.blender.org/blender/blender/issues/78395 In the interim, have you maybe tried "UV > Align Rotation > Auto" from the UV Editor menu?
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 label 2023-07-11 12:23:52 +02:00
Joanna Vetulani commented 2023-07-14 00:41:38 +02:00
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Hi, thanks for the report. Could you share .blend file and steps to redo the issue locally?
cc @Chris_Blackbourn

Just unwrap the selected quad. in 3.5 the quad unwraps straight (ideally it would maintain it's orientation in 3D but 90 degree rotations are still acceptable). In 3.6 it's rotated diagonally. Sometimes the rotations are 45 degrees, on other polygons they're less predictable.

> Hi, thanks for the report. Could you share .blend file and steps to redo the issue locally? > cc @Chris_Blackbourn Just unwrap the selected quad. in 3.5 the quad unwraps straight (ideally it would maintain it's orientation in 3D but 90 degree rotations are still acceptable). In 3.6 it's rotated diagonally. Sometimes the rotations are 45 degrees, on other polygons they're less predictable.
Unwrap3_6.png
237 KiB
UVRotation.blend
923 KiB
Unwrap3_5.png
204 KiB
Unwrap3_6.png Unwrap3_5.png
Joanna Vetulani commented 2023-07-14 12:07:34 +02:00
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We can potentially add options to the Unwrap operator to help with this. It will probably make the most sense to bundle with #78395

In the interim, have you maybe tried "UV > Align Rotation > Auto" from the UV Editor menu?

Hey, yeah that does the job! It'd be great to be able to set that behaviour as default in the unwrap settings.

> We can potentially add options to the Unwrap operator to help with this. It will probably make the most sense to bundle with https://projects.blender.org/blender/blender/issues/78395 > > In the interim, have you maybe tried "UV > Align Rotation > Auto" from the UV Editor menu? Hey, yeah that does the job! It'd be great to be able to set that behaviour as default in the unwrap settings.
Pratik Borhade commented 2023-08-03 10:47:28 +02:00
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Just unwrap the selected quad. in 3.5 the quad unwraps straight (ideally it would maintain it's orientation in 3D but 90 degree rotations are still acceptable). In 3.6 it's rotated diagonally. Sometimes the rotations are 45 degrees, on other polygons they're less predictable.

Yes, can confirm (missed the notification somehow)

> Just unwrap the selected quad. in 3.5 the quad unwraps straight (ideally it would maintain it's orientation in 3D but 90 degree rotations are still acceptable). In 3.6 it's rotated diagonally. Sometimes the rotations are 45 degrees, on other polygons they're less predictable. Yes, can confirm (missed the notification somehow)
Pratik Borhade changed title from Uv Unpacking creates diagonal pieces instead of straight ones. to Regression: Uv Unpacking creates diagonal pieces instead of straight ones. 2023-08-03 10:50:32 +02:00
Pratik Borhade commented 2023-08-04 07:45:06 +02:00
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Caused by 3ea060860a

Caused by 3ea060860a4dd758dfeaee5c63fb4aa4a8a0b82b
Pratik Borhade added this to the 3.6 LTS milestone 2023-08-04 07:45:27 +02:00
Brecht Van Lommel commented 2023-09-12 14:12:17 +02:00
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In the general case, rotations like this can help make packing a lot more efficient. So I think an option to control rotation would make sense.

For this particular case, we could just never rotate (or only 90°) when packing single islands. Once you add two or more islands it's not likely to pack things diagonally anymore. It's still possible, but perhaps means that users would not have to manually set a rotation option often.

In the general case, rotations like this can help make packing a lot more efficient. So I think an option to control rotation would make sense. For this particular case, we could just never rotate (or only 90°) when packing single islands. Once you add two or more islands it's not likely to pack things diagonally anymore. It's still possible, but perhaps means that users would not have to manually set a rotation option often.
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Joanna Vetulani commented 2023-09-19 23:47:53 +02:00
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In the general case, rotations like this can help make packing a lot more efficient. So I think an option to control rotation would make sense.

For this particular case, we could just never rotate (or only 90°) when packing single islands. Once you add two or more islands it's not likely to pack things diagonally anymore. It's still possible, but perhaps means that users would not have to manually set a rotation option often.

Another thing to consider is that rotating islands and maximising space when packing is not always as beneficial for baking as people think. It promotes diagonal lines where straight ones would be instead and pixelates straight lines often requiring much higher resolution bakes, in fact it's pretty unwanted in lightmap packing. And for games textures get scaled down or mip-mapped and you want straight lines to bake as straight to minimise pixelation.

> In the general case, rotations like this can help make packing a lot more efficient. So I think an option to control rotation would make sense. > > For this particular case, we could just never rotate (or only 90°) when packing single islands. Once you add two or more islands it's not likely to pack things diagonally anymore. It's still possible, but perhaps means that users would not have to manually set a rotation option often. Another thing to consider is that rotating islands and maximising space when packing is not always as beneficial for baking as people think. It promotes diagonal lines where straight ones would be instead and pixelates straight lines often requiring much higher resolution bakes, in fact it's pretty unwanted in lightmap packing. And for games textures get scaled down or mip-mapped and you want straight lines to bake as straight to minimise pixelation.
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