Author Topic: Metal IOR  (Read 1090 times)

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Offline cjwidd

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Metal IOR
« on: June 01, 2018, 10:55:50 pm »
When using the 'metal' shader, you cannot manipulate the material's IOR. What IOR value is used internally by the shader?

Offline Søren

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Re: Metal IOR
« Reply #1 on: June 11, 2018, 01:27:51 am »
The underlying calculation is based on measured spectrally varying complex indices of refraction. I.e. gold has IOR of about 5.9 + 0.2i at 885 nm light (red) and 1.9 + 1.8i at 300 nm light (blue). Is is not a simple index of refraction for all wavelengths. This also affects how the thin-film behaves when you enable the anodized option.

Søren

Offline cjwidd

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Re: Metal IOR
« Reply #2 on: June 11, 2018, 11:42:41 am »
Very interesting, and thank you for sharing the details. It's good to know that the reflection properties are grounded in real data.