 
   accordion: (angle, anchor, options) ->
     normalized = @_normalizeArgs 'accordion', arguments
-    return if not normalized
+    return unless normalized
     [angle, anchor, options] = normalized
 
     for panel, i in @panels[anchor]

    @accordion angle / 10, anchor, options


  curl: (angle, anchor, options = {}) ->
    normalized = @_normalizeArgs 'curl', arguments
    return if not normalized
    [angle, anchor, options] = normalized
    angle /=  @_getPanelType anchor


            @_setShader i, anchor, angle

        , delay


  unfold: (callback) ->
