surface main( varying color Cambient = 0;

varying color Cdiffuse = 0;

varying color Cspecular = 0;

varying float Froughness = 0;

)

{

Os=1;

//####

Oi = Os;

Ci = Os*(Cambient*ambient() +Cdiffuse*diffuse() + Cspecular*specular(N,-normalize(I),Froughness));

}