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I'm trying to unwrap my first model and there's some problems I can't get around. First, my circular faces are getting an oval shape in the map (image below), second, sometimes a mesh will get much bigger in the map than it is in the model and I don't know how to make the canvas map larger for it to fit in. Thirs, some of my faces are turned into edges in the uv map. Can anyone shed some light in what I could do to solve this? Thanks in advance. enter image description here

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  • $\begingroup$ Most of these are just from the fact that UVs do not necessarily correspond with the shape of the faces they came from, just how they connect with each other. However, faces really shouldn’t be squashed so thin that they look like edges. Are you sure those faces are selected when you’re unwrapping? Did you set up seams correctly, or is there something that’s causing the faces to have to be squashed in the unwrap? $\endgroup$
    – TheLabCat
    May 7, 2022 at 23:20
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    $\begingroup$ What is the object scale in N-panel? Can you try applying scale (ctrl + A) if the scale value is not 1 on all axes? $\endgroup$ May 7, 2022 at 23:38
  • $\begingroup$ What command did you use to unwarp, IE, what entry in the unwrap menu? $\endgroup$ May 7, 2022 at 23:53

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Your object might have non uniform scale

Unwrapping unmodified circle works as expected

uniform scale

However, if we scale it by 2 on x-axis, and then reverse the scale in edit mode, the unwrap is squished even though the object looks identical to the first one.

Non uniform scale

The previous action sets the object scale to 2,1,1. While calculating the UVs, Blender sees that the object was scaled by 2 in X direction, so it must account for that and not give extra texture space in X direction. Hence the UVs get squished.

non uniform scale

[blender: The object looks like a circle but it is scaled by 2 on X. So originally it must look like in ellipse. I'll perform the operations on ellipse,since that's the original geometry]

You also get a reminder in the status bar.

status bar message

You can fix this by applying the scale. press Ctrl A and choose scale. Goto edit mode and unwrap. This will set the scale to 1,1,1 => tell blender to set the original geometry to what it looks like right now

applying scale

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