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I've built my first 3D model using 2.71. It consists of several meshes including cylinders a cube and a plane and I've animated one of the parts. I'm ready to use the UV/Image Editor to export a texture map.

I've expanded the 2nd view panel, switched to UV/Image Editor mode. Returned to the 3d view panel and tried to select all of the parts using the A key, then typed U and chose Smart UV Project.

Only one part is unwrapping and I'm stuck. How do I get all of my parts to unwrap?

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    $\begingroup$ Are you in object mode or edit mode when you press U? $\endgroup$ – gandalf3 Sep 9 '14 at 1:58
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    $\begingroup$ @gandalf3 He wouldn't see the option Smart UV Wrap if he was in object mode. $\endgroup$ – GiantCowFilms Sep 9 '14 at 2:00
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    $\begingroup$ @GiantCowFilms Good point.. If they are separate objects, you can still unwrap them all at once by selecting them in object mode, then pressing Space > Smart UV project. $\endgroup$ – gandalf3 Sep 9 '14 at 2:03
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    $\begingroup$ @gandalf3 Are you kidding me!!!!!!!! I have hunted and hunted for a way to perform batch Smart UV projects, and it was sitting in the space bar menu all this time. facepalm. $\endgroup$ – GiantCowFilms Sep 9 '14 at 2:14
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    $\begingroup$ If you want all objects unwrapped onto the one image there is the texture atlas addon. $\endgroup$ – sambler Sep 9 '14 at 6:46
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When you are in edit mode, only the active object is edited.

If you have multiple objects you want to unwrap you can either:

  • Join them into one object, then unwrap. Select them in object mode and press ⎈ CtrlJ, then unwrap in edit mode (U).

  • Batch unwrap them as separate objects. In object mode, select the objects you want to project onto the same UV map, then press Space and search for one of the scripted projections (Smart UV project, Lightmap pack).

    Note that you wont see the UV maps which are created without going into edit mode, and even then you will only see the UV map for the active object.

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  • $\begingroup$ As @MJP said, it is possible to see the UV map for all objects: "In your UV panel click View > Draw Other Objects to see UVs from multiple objects." $\endgroup$ – piegames Sep 14 '16 at 15:52
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I just had to do this. Unwrapping multiple objects to a single texture does NOT require joining them into a single mesh and unwrapping. Simply select all the objects, hit space, find Smart UV Project.. make sure Stretch to UV Bounds is UNSELECTED.

This will unwrap multiple objects to a single texture without overlapping UVs. This is a lifesaver.

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From this thread there seems to be an addon Multiple-Objects-Editing

Or the texture Atlas bundled with blender...

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  • $\begingroup$ you have to add more then links to make your answer useful $\endgroup$ – Chebhou Jul 28 '15 at 10:32

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