Hi
I've been testing around with the VrayMtl shader, and there is 1 thing i cant really get my head around..
In short: How am i supposed to determine fresnel IOR values, for any given material?
When using the PBR workflow (thus using metalness) Fresnel IOR values tends to be quite low in value (here referring to Vlado's IOR values, posted in Chris Nichols "Understanding Metalness" article) ranging from 1.002 for Aluminium, to 1.35ish for Gold...
However when i dont use a PBR workflow (so keeping metalness at 0) i need to use the Fresnel IOR at MUCH higher values to get conductive-like results - and nothing really seem to correspond "correctly" with any IOR lists or calculators i can find..
So, how do i actually determine which IOR value to use for any given material, in the different workflows?
Thanks
I've been testing around with the VrayMtl shader, and there is 1 thing i cant really get my head around..
In short: How am i supposed to determine fresnel IOR values, for any given material?
When using the PBR workflow (thus using metalness) Fresnel IOR values tends to be quite low in value (here referring to Vlado's IOR values, posted in Chris Nichols "Understanding Metalness" article) ranging from 1.002 for Aluminium, to 1.35ish for Gold...
However when i dont use a PBR workflow (so keeping metalness at 0) i need to use the Fresnel IOR at MUCH higher values to get conductive-like results - and nothing really seem to correspond "correctly" with any IOR lists or calculators i can find..
So, how do i actually determine which IOR value to use for any given material, in the different workflows?
Thanks
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