def after_initialize
      to.each do |attribute,final|
        start = actor.send(attribute)
        animations.push build_animation_step(attribute,start,final)
      end
    end
def after_initialize
      to.each do |attribute,final|
        start = actor.send(attribute)
        animations.push build_animation_step(attribute,start,final)
      end
    end
Additional initializion is required to calculate the attributes
 that are going to be animated and to determine each of their deltas.