Here is tutorial. There are step where author use FakeAOIII node from http://bwide.wordpress.com/node-groups/bwide-nodepack-for-blender/ to help find edges on object. I try many times but i cant recieve same result that he have in Step 3 - “Edge Scratches”. Author in coments dont say anythin that can help with it.
May be some one can try thru this tutorial and can say what I do wrong (my result for step 3 on picture)?