Trying to follow along with tutorial I've done everything EXACTLY as he decribes every step of the way --however at only 35 seconds in when I try to "Bake the AO" I get an error message "No active UV layer found in the Object Suzanne" --what didn't I do right?

http://www.blenderguru.com/tutorials/how-to-grunge/ How to Grunge

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    $\begingroup$ You must first UV unwrap the object. For the purposes of baking all you probably need to do is enter edit mode (Tab) and press U> Smart UV Project or Lightmap pack. $\endgroup$ – gandalf3 Nov 11 '15 at 21:20
  • $\begingroup$ You'd think he could have put that in the tutorial huh? Thanks. $\endgroup$ – Marc Nov 11 '15 at 22:14

A UV map is required in order to bake.

To UV unwrap a mesh, switch to edit mode (↹ Tab) and press U.
Usually an automated method like Smart project or Lightmap pack is good enough for baking, but for other uses you may want to use manually placed seams.



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