B3.5 still unwrapping aspect ratio problem

Hi all !

Could anyone please tell me why smart UV project is unable to have proper aspect ratio ?

Here’s the thing:

this is just a 1:1 aspect ratio stretched to 2:1 A/R image.

Is there a workaround for this ( veeeeeeeeery old… before 2.79 ) bug ?

Thanks and happy blending ! :smiley:

Here’s a semi-quick workaround:

  1. smart uv project
  2. seams from islands
  3. unwrap

hi @SterlingRoth :slight_smile:

Thanks for your answer !
I didn’t know the seams from islands feature :smiley:

However, this seems not to work. I still got my wrong UV aspect ratio :confused:

hm, does the object have a material that references that (or another) texture?

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Yes there’s a material with various aspect ration textures…

Indeed, i think i found a way…

It is weirdo as often in blender :rofl: but at least i seem to be able to reproduce the thing.

The unwrap process just dont care the A/R of the texture in texture editor. It ONLY cares the ACTIVE texture node in nodes editor.

This means if the tex in image editor is 1:4 and the active ( or last ) texture node in node editor is 2:1 then the UVs will be unwrapped according the 2:1 aspect ratio.

Thais is imho the worst choice that could have been done but at least, this can be reproduced…

Now i just have to build a small script to fake the selected texture in nodes editor and this shoud do the trick…

Oh and, the ‘seams from islands’ work perfectly for this :wink:

Thanks a lot and happy blending !

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And finally i managed to bake my 2:1 piece of AOmap for my project :slight_smile:

Thanks a lot @SterlingRoth !!!

Happy blending !

Back there just to post a lil update.

I’m sooooo glad the unwrap aspect ratio enigma has been solved ! :smiley:

Now with a lil piece of script, i can just unwrap on non 1:1 images and have proper proportions on my unwraps !!!

This is awesome !

Happy blending ! :slight_smile: