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Oh, mighty Blender elders.

I'd like to know if this is a bug, or intended behavior.

What is going on
I have three textures with different aspect ratios. 1:1, 2:1, 3:1.
But when unwrapping, the UV map aspect ratio is always based on the image selected in the shader editor.

It seems that unwrapping depends on your shader editor image texture, not the texture in the UV editor.

enter image description here

So, in some cases, there's no way to match the correct aspect ratio.

Example:
2:1 in UV editor, 3:1 in shader editor. And no way to match the correct ratio.

enter image description here

Additional notes:
This concerns all UV unwrap methods and projections.
Correct aspect ✓ doesn't work either - it only switches to 1:1 ratio.
Even after removing an image from file, Blender still unwraps in it's ratio.

Question

Is this intended behavior?
Or is this a bug that should be reported?

Here is the file for testing, images included.

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    $\begingroup$ yes it took me time to understand until I understood that you have to select the Image Texture node. Actually as a beginner you expect the unwrap to be 1:1 whatever is the selected image in the UV Editor. I don't know why it doesn't work that way, it might cause problems that I don't get... $\endgroup$
    – moonboots
    Commented Nov 1, 2020 at 10:46
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    $\begingroup$ I've made a small mistake in my first example, that you've corrected, of course : If you select 1:1 in the Shader Editor, and select 1:1 in the UV Editor, you'll see the correct scale, then if you select 3:1 in the UV Editor, it will be scaled 3 times on the X axis (and not 1/3) $\endgroup$
    – moonboots
    Commented Nov 1, 2020 at 10:52

1 Answer 1

Reset to default
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The UV scale will depend on the scale of the selected Image Texture node in the Shader Editor, but its appearence will be stretched in the UV Editor, depending on the selected image here. If you select the same image in Shader Editor and UV Editor, the UV will appear at the right scale.

If you select 1:1 in the Shader Editor, and select 1:1 in the UV Editor, you'll see the correct scale, then if you select 3:1 in the UV Editor, it will be scaled 3 times on the X axis.

If you choose 3:1 in the Shader Editor and choose 1:1 in the UV Editor, it will look scaled 1/3 of its X scale, if you switch to 2:1 in the UV Editor, it will be 2/3 of it X scale, it will only look good if you switch to 3:1 in the UV Editor.

It works as expected, but it surprises a bit at the beginning.

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