Daylight simulation for Multi-Layer ETFE Pillows

Hi all,

I wonder if anybody has recommendations for modeling multi-layer ETFE
pillows similar to what you can see in this project: (


)

If you are not familiar with this system here is a video that shows how the
system [potentially] works: (http://www.youtube.com/watch?v=7VSoUxvtiNo)

There are multiple layers of ETFE with different coating patterns. What is
the best way of modeling this system considering all the possible internal
reflections? Is this a good case for three-phase method daylight simulation?

Thanks in advance,
Mostapha