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I'm trying to unwrap a cube (I know, super complicated). I've got the seams marked, the UV editor open in a 2nd window, and all the geo highlighted. When I tell the cube to unwrap nothing happens. That's pretty much the long and short of the problem. Now I've been working off this one file for a couple weeks now, saving it off the original file and continuously cloning geometry. It's entirely possible I did something, pressed a button, something.

Any thoughts.

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    $\begingroup$ To unwrap uv's you mark any seams you want, select the faces you want to unwrap, press U and select one of the unwrap options while in edit mode. Only selected faces (or those surrounded by selected verts/edges) will be unwrapped. Only selected faces will show up in the uv editor. My guess is you aren't selecting anything. $\endgroup$ Commented Mar 20, 2014 at 12:37
  • $\begingroup$ No everything is selected and I'm in edit mode. The seamed edges are red and the selected faces are bright orange. That part isnt the problem. Selecting an unwrap option, and I've tried all of them, produce no visible result in the UV Editor. In a bit here I'll post the file in question and then I'll start pulling my hair out as someone makes it all happen in one go I'm sure... $\endgroup$ Commented Mar 20, 2014 at 18:50
  • $\begingroup$ Here's a link to the blend itself: [link]dl.dropboxusercontent.com/u/8750289/cube%20unwrap%20issue.blend $\endgroup$ Commented Mar 20, 2014 at 20:12
  • $\begingroup$ I just created a new blend file and built the exact same object. The unwrap worked just fine. Something is clearly wrong with the file I linked. $\endgroup$ Commented Mar 21, 2014 at 0:40
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    $\begingroup$ You can pull your hair out now... ;-) you don't see the uv's as you are displaying the render result in the image editor, change it to an image or click the X to hide the render result and you will see them. $\endgroup$ Commented Mar 21, 2014 at 0:48

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To unwrap UV's, you mark any seams you want, select the faces you want to unwrap, press U and select one of the unwrap options while in edit mode.

Only selected faces (or those surrounded by selected vertices/edges) will be unwrapped. Only selected faces will show up in the UV editor.

Also UV's aren't displayed in the UV/image editor if the Render Result is displayed in the UV/Image Editor. You need to select an image or click the X to close the render result to see UV's.

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    $\begingroup$ Huge thanks man. I'm still stumbling through the program pretty badly at the moment and I would be lost without you and others like you. $\endgroup$ Commented Mar 21, 2014 at 1:28
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    $\begingroup$ Lifesaver. I forgot that you need to specify which faces to unwrap! I wonder if it would be reasonable for blender to unwrap the whole object by default, if no faces are selected. $\endgroup$ Commented Oct 5, 2015 at 20:50
  • $\begingroup$ Ditto - This has been great news. I didn't know what the 'X' was for, so didn't want to close something I didn't intend to. Thanks, @sambler! $\endgroup$ Commented Oct 14, 2016 at 14:20
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    $\begingroup$ This is terrible, failing without showing an error $\endgroup$ Commented Dec 5, 2016 at 23:05
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    $\begingroup$ Blender has way too many stupid pitfalls like this. Makes sense maybe for seasoned pros but for noobs it's maddening. Maybe they could come out with a 'noob mode' with workarounds for say the top 50 complaints. $\endgroup$ Commented Jan 27, 2019 at 0:02
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One thing I stumbled upon:
Blender UV Panel
I was in my UV Editing layout unaware that my coworker had changed the UV Editor panel to Image Editor panel. And there I sat waiting for the UV to appear. You need to always double check the obvious in blender.

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