Index of Refraction

General questions about Indigo, the scene format, rendering etc...
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Akhenathon
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Index of Refraction

Post by Akhenathon » Fri Dec 05, 2008 9:53 am

Hi, all. :)

IOR of materials are measured in the Fraunhofer D-line of the spectrum (the sodium emission, 589.592 nm).

The A-coefficient in the Cauchy equation is the material IOR, when wavelength tends to infinity.

Indigo asks for the IOR and the B-coefficient. Which one is the correct value for the IOR: the A-coefficient or the tabulated IOR (measured in the D-line)?

Thanks in advance.
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OnoSendai
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Post by OnoSendai » Fri Dec 05, 2008 12:39 pm

The A coefficient.

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Akhenathon
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Post by Akhenathon » Sat Dec 06, 2008 3:24 am

Thank you, Ono.

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