I have created a rectangular box mesh and removed the front face and applied solidify to create thickness to the sides and top. I have successfully uv unwrapped an image texture to one side but when I unwrap on the other side (to apply the same image texture) it displays as a triangle instead of a rectangle. I have tried dissolving various edges without success. What is causing this problem? I have attached the blender file. enter image description here

  • 1
    $\begingroup$ I don't know how you ended up with this triangle, 2 vertices are overlapping, just unwrap again? $\endgroup$
    – moonboots
    Dec 28, 2023 at 21:27
  • $\begingroup$ Just about to step out of my house I will try that later. Thanks $\endgroup$ Dec 28, 2023 at 21:54
  • $\begingroup$ {"Could it be that v3.1 isn't compatible with the version your created it with?"} — Right, the file was made with the 4.0.2 version. But now I've converted it to 3.1. You can download it again from my answer (I've updated the link). Though I recommend you to update your blender to 4.0.2. The new version is better in many ways. You can download it from [www.blender.org/download] (new version can open all old files, but old versions cannot open the files which are made or was edited in the newer versions) $\endgroup$
    – Yaroslav
    Dec 29, 2023 at 2:49
  • $\begingroup$ {"another question relating to solidify which made the sides 'thinner' than the top and bottom"} — I've checked "Solidify" modifier and "Solidify Faces" function – both give the even thickness. I suggest you've encountered the uneven thickness because of the scale was not applied to the object. Try to apply the object's scale first: In 'Object Mode' press [Ctrl + A] —> [Scale]. After that you can solidify the object properly. $\endgroup$
    – Yaroslav
    Dec 29, 2023 at 3:08
  • $\begingroup$ Thanks Yaroslav. I thought that I had applied Scale but perhaps I didn't as I started a new 'box' and the solidify worked correctly (as Blender v3.1 crashes when I attempt to loaf your 'fixed blender file'. I intend to search Youtube for converting N-Gons as I think I remember seeing something once on that subject. Thanks again for your help. $\endgroup$ Dec 29, 2023 at 11:06

1 Answer 1


You had a nasty N-Gon there. It was causing glitches.

I've replaced it with a quad and re-unwrapped.

Then adjusted the opposite side of the box correspondently (to both sides having the exact same geometry)


enter image description here


  • $\begingroup$ Thanks Yaroslav. I had to go out shopping and meet someone and have just arrived home. I was going to resort to rebuilding the 'box' but now I don't have to thanks to you. $\endgroup$ Dec 29, 2023 at 1:11
  • $\begingroup$ [added later] In fact I think that I may have created the box incorrect in the first place and may have removed the front and rear faces before adding solidify and then trying to add the rear face (selecting the edges and then F (fill) instead of just removing the front face. Which begs another question relating to solidify which made the sides 'thinner' than the top and bottom (which seemed to be 'hooked' to the length of each side). I looked for a method to force solidify to make all sides the same width and everything I tried didn't seem to fix that problem- tried Mode and 'thickness'. $\endgroup$ Dec 29, 2023 at 1:44
  • $\begingroup$ Sorry another one. I cannot open the 'fixed' blender file. Could it be that v3.1 isn't compatible with the version your created it with? $\endgroup$ Dec 29, 2023 at 1:52

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