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- IOR - The color in the normal or directly facing viewing direction of the surface defined using Eta or an IOR measurement of a metallic surface.
- Extinction - How the color of the surface changes from the direct to glancing view using a measurement referred to as Kappa , or extinction. White means no change.
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How strong the reflection tail effect is as a linear measurement 0 to 1, or maximum strength
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Length
How rough/wide the effect is from none at all to 1 or to none with a negative value.
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