Eric
I need thickness to get a more pronounced effect at grazing angles. Ingoring reflections, a coloured laquer should be transparent head on but quite saturated at grazing angles.
I would settle for a fake effect; specify a trans colour for 0 degrees another for 90 degrees and a midpoint angle.
(that option would be great for weightmaps too, an example of usefullness would be curtains and sheer tights.)
