not for the visable effects of refaction it isn't. Perhaps in some theoretical point of observation within the naterial at some subatomic level but not as it is observed from outside the object looking at the surface. What we might consider for working in Bryce is multible interfaces, tranlucent or transparent paints, varnishes waxes etc and the fact that truely 100 percent opaque surfaces are not as common as we might at first think for example a leaf, a hair, some plastics and all skin all have some degree of transparency/translucence. What is absorbed into the material is lost as far as the refraction we see at the surface goes - what light is absorbed affects color and radiosity but not refraction. - TJ