anchor.diff:  *  Non-shiny objects have a black specular color.
   
   
  -image::tanlglow2.png[tanlglow2.png,400,234,align="center"]
  +image::intermediate/tanlglow2.png[tanlglow2.png,400,234,align="center"]
   
   
   
  
positive.code: ==== Surface Normal Vectors
  
  [.right]
  image::300px-surface_normal.png[300px-surface_normal.png,width="",height=""]
  
  A surface normal is a vector that is perpendicular (orthogonal) to a plane.
  You calculate the Surface Normal by calculating the cross product.
  
negative.code: 
  
  [.right]
  image::intermediate/blenderswordsman.png[blenderswordsman.png,width="195",height="151"]
  
  
  An animated character has an armature: An internal skeleton (Bones) and an external surface (Skin). The Skin is the visible outside of the character and it includes clothing. The Bones are not visible and are used to interpolate (calculate) the morphing steps of the skin.
  