It just a material.

material {
interior {
ior 1.5
}

texture {
pigment {
color rgbf
}

finish {
ambient rgbft
diffuse 0.1
phong 1
phong_size 400
specular 0.8
roughness 0.003
irid { 0
thickness 0
turbulence 0 }

reflection {
rgbft
}
}
}
}

Just cut and paste this into KPov. (It automatically changes the text into its objects).

Or look under share/apps/kpovmodeler/examples/

Theirs lots of pre-defined materials including this one.

very nice, but how did You create the glass under KPov?

I could just send you the file?