Perhaps one needs to be under 70! I agree with the Fresnel descriptions but the relationship of the theory with Shader Ops and the Toxe free shaders eludes me. Sardtoks description of Baking--and another look at Juliens Baker plugin--still makes me wonder how "baking" is the description. Any one up to tackling the Preferences question-- or Carrara Dictionary say? Thanks all. Brian

bwtr