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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.)