I have created a model in blender consisting of many cubes. Now instead of UV unwrapping every single cube, how can I UV unwrap all cubes together to one UV map?
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1You can join them all into one object, map it and Separate by loose parts to get individual cubes back. – Jan Kadeřábek Dec 08 '16 at 11:25
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You can join them with CTRL+J when you have them all selected. – Josh Silveous Dec 08 '16 at 12:52
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1Try the texture atlas addon - you can find several tutorials on youtube for it. – sambler Dec 08 '16 at 13:46
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The best way IMO would be using the Texture Atlas add on as joining meshes is sometimes destructive (think you have different modifier for each object- as in my example pictured below).
Enable the add on in User Preferences (Ctrl+Alt+U).
Select all your objects in Object Mode, go to the Render header-->Texture Atlas panel and press the '+' button, then OK. Next press Start Manual Unwrap button. Enter Edit Mode, go to the UV Editor, select all islands (A) and pack them (Ctrl+P). Now you have all the objects' maps combined in one UV Map. Finally press Finish Manual Unwrap button to separate objects.
Paul Gonet
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It depends on whether he wants cubes to use the same texture / mapping (my anwser) or to have independent map (your anwser). – Jan Kadeřábek Dec 08 '16 at 20:34