https://i.ytimg.com/vi/GhFBaKEns4I/hqdefault.jpg

In this tutorial both Frederik Steinmetz and Gottfried Hofman explain the differences between baking normals in Blender internal or Cycles render engine.
Find out more about normals here: http://blenderdiplom.com/en/tutorials/all-tutorials/589-tutorial-normal-baking-with-cycles.html
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