ext. shading device

[Alfred Haider <alfred.haider@xxxxxxxxxxxx>]

Title: ext. shading device

Hello,

I had a little question and I will be glad if someone could help me.
Whats the best way to simulate an ext. shading device like you can see on:
http://home.arcor.de/alfred.haider/simul.jpg (the yellow one)

It's a high-reflecting perforated metal plate with 15% hole-proportion

Thanks for any help.

bye,
  Alfred Haider