Thank you for kind reply, slbaumgartner, but this is not what I completely want. I wanna distinguish overlapped area and express this with different colors. Each color will indicate the number of overlapped areas. Face flash is main problem and wanna solve it with Ruby It's so hard. If possible, I would like to apply this to even 3D shapes.

The picture is just what i ideally wish. Usually, we will see three overlapped circles in one color unless we add color to overlapped areas. I would like to distinguish areas easily. I want to avoid making results like an attached picture, can't know which areas are overlapped double or more

Hello.
I'm looking for a way how i can distinguish overlapped areas easily. Sketchup supports paint bucket tool. Its really nice but, is too tiring to add color to overlapped faces continuously. I wanna keep working it efficiently. Is there a great tool recognizes overalapped areas and adds color by itself? and can it apply to 3D shapes?