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I just finished UV mapping a large object that was split into many parts, some parts were new and made in Blender, but the original object was built in another package, which uses a different default UV map name, so that when I joined the new objects to it, I ended up with multiple UV maps on the same object when I just wanted one.

Although I fixed my problem by undoing the merge and renaming the UV maps to all be the same before merging again, I would like to know if there is a correct way to copy UV data between different maps on the same object, or of merging multiple UV maps into one.

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You can copy UV maps from one object to another (provided their vertex count and index match) by selecting one object, then shift+select the second.

I press spacebar - type in "UV" and select "Transfer UV Maps".

I'm not sure but I think the order is copy from object 1 to active object. You may have to experiment to find out the correct selection order (use UNDO). It will copy to the currently selected UV map in the "Object data" tab.

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  • $\begingroup$ Thanks, that's also useful to know, but I'm talking about copying UVs between two maps on the same object. $\endgroup$
    – MrFlamey
    Dec 19, 2014 at 2:53
  • $\begingroup$ Oh I see. Sorry to misunderstand. To merge all into the same UV map they all have to have the same UV map name before merging with ctrl+j $\endgroup$
    – beiller
    Dec 19, 2014 at 14:59

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