#declare Glass_Finish=
finish {
    specular 1
    roughness 0.001
    ambient 0
    diffuse 0
    reflection 0.1
 #if (version<3.1)
    ior 1.5
 #end
}

#declare Glass_Interior = interior {ior 1.5}

#declare Glass =
texture {
    pigment { rgbf<1.0, 1.0, 1.0, 0.7> }
    finish  { Glass_Finish }
}
#declare M_Glass = material {texture {Glass} interior {Glass_Interior}}