@bagginsbill: Just a thought... Have you tried "Edge Blend"? "The Edge Blend node blends color nodes based on surface and camera angles" (from the manual...) What you have done looks excellent; it's just possible that edge blend may be able to achieve the same effect at less cost... I don't know, haven't tried it, (can't try it at the moment), just tossing balls in the air and seing where they land..:-)) Cheers, Diolma