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Messages - noldo

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Work in Progress/Tests / Re: dubcats secret little hideout
« on: 2019-02-02, 10:20:48 »
Hi Dubcat!
I am an octane render user, but this post is very interesting!!!
I think your "Specular To Ior v.2" LUT is a bit broken (sorry for my english)
If i convert a sRGB 59 grayscale image (1.5 IOR), the lut give me a value of 167.
I think the correct value is 170 (1/IOR = 1/1.5 = 0.6666666666 => 0.666666666x255=170).
Seems your LUT multiply the value x 250 instead of 255.
Thanks for your work!

P.s. Maybe my fault, wrong monitor color profile?

P.p.s. After some more investigation, i found a way to convert specular to IOR map in octane, but i think corona treat the IOR map the same way (a grayscale value that represent 1/IOR value)
I connected in nuke an expressioni to the specular map with the following formula "1/((r+2*sqrt(r)+1)/(1-r))", then connect the output to a writer image.

P.p.p.s. Your LUT is correct, my fault, i don't understand why 167 instead 170... Bah!

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