anchor.diff:  
   [source,java]
   ----
  -thing.setLocalRotation(
  -  new Quaternion().fromAngleAxis(180*FastMath.DEG_TO_RAD, new Vector3f(1,0,0)));
  +thing.setLocalRotation(  new Quaternion().
  +    fromAngleAxis(180*FastMath.DEG_TO_RAD,
  +        new Vector3f(1,0,0)));
   ----
   
   a|nodding your head
  
positive.code: a|width
  
  |===
  [cols="55,15,15,15", options="header"]
  |===
  
  
negative.code: a|+forward -backward
  
  |===
  
  [cols="55,15,15,15", options="header"]
  |===
  
  