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Actually I don’t think there is a good equation to deal with this problem. I picked the dominant wavelength for each component.

I’m curious, how do you handle the conversion from wavelength data to RGB triples for the IOR components? Do you just pick the values of the dominant wavelengths of the three sRGB primaries or go the full way (multiplying with the CIE XYZ curves, integrating to get XYZ values and multplying with the XYZ->sRGB matrix)? Must test to see if it makes any difference from what I’ve already done. It would still be slow but it’s possible to optimize the internals of the node based on the user input. These are common problems that nodegroups suffer, and I tried at all costs to avoid not that I haven’t thought about it. Third, it doesn’t add any event handlers, and integration with cycles nodes is seamless. Second, tangent and normal inputs don’t need to be connected for the node to work. First, it doesn’t fill your node groups list from the add menu with nodegroups. If you ever tried to do it, you know that it’s slow and boring.Īpart from the shader functionalities for render, I wrote this node with a few details in mind. But it jumps the steps of finding the correct value for each color component wavelength from the interpolation of the sample data. and websites are online, just go there choose the material you want and download the data basically it gives you the correct fresnel values based on nk input. Sopra-sa has been down for quite some time, but you can find the database in the internet.