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Blender

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    $\begingroup$ If Blend is adding additional Blender, then when using the Layer Weight node, what determines the IOR that it's using? I don't really understand the complex math enough to follow much from that link. Is there a way to translate IOR into a value between 0 and 1 and use it in layer weight accurately? And if you could, would that be even close to physically accurate? $\endgroup$
    – Ascalon
    Commented Apr 30, 2015 at 20:20
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    $\begingroup$ @Drudge I don't know if it's physically accurate (depends on the coding that developers know) but by comparing the results from both nodes on a test sphere you can use formula: IOR = 1 - log(1 - Blend) $\endgroup$
    – Jaroslav Jerryno Novotny
    Commented Apr 30, 2015 at 20:36
  • $\begingroup$ Correction: That formula is wrong it has a different graph function than what it should. It matches in the border cases but that's all. See the plot what the graph is. $\endgroup$
    – Jaroslav Jerryno Novotny
    Commented May 1, 2015 at 9:23
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    $\begingroup$ The formula is IOR = 1/(1 - blend) $\endgroup$
    – brecht
    Commented May 1, 2015 at 9:31