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This is done by attaching a "rainbow" like color map to the highlights channel. The color map is driven by an "angle of incidence" node.

I don't know how to attach a Rainbow like color map to the highlights channel. I'm not sure if that can be done in the basic material editor or if I would need the FE.  But if I could figure out how to do that in the basic material editor, I could then probably handle adding an angle of incidence node in the FE.

Frank Hawkins/Owner/DigitalDaydreams

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