 
   activateFrame: (@active) ->
     @active = modulus +@active, @classification.subject.location.standard.length
-
     # update asteroid tracking
     @setAsteroidFrame(@active)
-
     # update artifact marking
-    #
-
     @showFrame(@active)
 
   setCurrentFrameIdx: (frame_idx) ->

      @markingSurfaceList[i].on 'create-tool', (tool) =>
        tool.controls.controller.setMark(@currFrameIdx)

        

    #######################################################
    #  API event bindings
    #######################################################

    @el.addClass 'playing'
    @disableMarkingSurfaces()
    # @markingSurfaceList.disable()   # no marking while playing
    # flip the images back and forth once
    last = @classification.subject.location.standard.length - 1
    iterator = [0...last].concat [last...-1]
