Regression: Uv Unpacking creates diagonal pieces instead of straight ones. #109906
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Reference: blender/blender#109906
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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:
c7fc78b81ecbWorked: 3.5 and previous
Caused by
3ea060860aShort 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
UVRotation.blend
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.
Hi, thanks for the report. Could you share .blend file and steps to redo the issue locally?
cc @Chris_Blackbourn
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?
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.
Hey, yeah that does the job! It'd be great to be able to set that behaviour as default in the unwrap settings.
Yes, can confirm (missed the notification somehow)
Uv Unpacking creates diagonal pieces instead of straight ones.to Regression: Uv Unpacking creates diagonal pieces instead of straight ones.Caused by
3ea060860aIn 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.