; docformat = 'rst'
;+
;This function takes in a 3D vector and returns its normalized 3D vector.
;
; :Examples:
;   norm_vec = normalize_grid(vec)
;-
;+
; :Params:
;   v : in, required, type=vector
;     Input vector that is to be normalized. Must be a 3D vector only.
;     
; :Returns:
;   Returns the normalized 3D input vector.
;-
function normalize_grid,v
  resolve_grid,v,x=x,y=y,z=z
  len=vlength(v);
  result=compose_grid(x/len,y/len,z/len)
  return,result;
end