What isn the wavelenght that vray is using to calculate refraction/reflection index..

[Dariusz Makowski (Dadal)]

Heya

Like topic said, I want to check my refraction indexes if I have them accurate.

Thanks ciao.

[vlado]

I believe it's the green one, but I have to check for certain.

Best regards,
Vlado

[Dariusz Makowski (Dadal)]

Umhhh any chance to get a coresponding number? Im trying few physics websites they ask me for some details to calculate correct IOR for materials...

[zeronove]

few physics websites ...

out of curiosity, could you post any links?

[super gnu]

http://refractiveindex.info/

[Dariusz Makowski (Dadal)]

http://refractiveindex.info/

yup thats it - do u know the wavelength I need for vray/mental ray ?

Thanks, ciao.

[super gnu]

not a clue.. in the past ive just used 575 nm, as its about halfway up the visible spectrum, just to get an idea of the kind of vaues i need.. no idea if this is a good idea or not, but to be honest ive never been super precise about correct values. if it looks good, its right kinda thing.

[Dariusz Makowski (Dadal)]

Heya

Bump still need the value dear chaos team !

As to 575 I know Maxwell runs at 0.508 wavelength...

[vlado]

For V-Ray, this seems to be 0.5892; this only matters for dispersion though.

Best regards,
Vlado

[Macker]

What?

This thread just went totally over my head. I didn't know VRay used wavelengths in its calculations?

[vlado]

There are a few places where we use spectral data; one is where we compute the colors for the VRaySun/VRaySky system (or when you use the "temperature" spinner of lights); the other is when computing dispersion.

Best regards,
Vlado

[Macker]

Aha! You learn something new every day!