Tried to avoid creating this for more than a decade, but caved in now
I really always wanted to rely on presets for this (better matching and characterisation of real world objects).
But this (and a couple of other things) should always work even if a non-standard set of presets is being used.
@simon "can easily be by using a second way with the SAME nodes".
@mdione Fixed (blames old age and failing eyesight).