Water absorption scattering values.

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Sprocket
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Water absorption scattering values.

Post by Sprocket » Fri Aug 10, 2018 10:01 pm

I remember back on the old luxrender forums there was a lot of info about scattering values taken from papers, or converted from papers. Unfortunately the internet archive of the forum site does not have those pages saved (unless i just didnt find a good snaphot)

I was wondering if anyone had some absorption and scattering values for water? I did at one stage, but Ive lost the blend files...
underwater test v2.png
Also is there any plans or possibility to include a tabulated data texture in the future?
Last edited by Sprocket on Wed Aug 15, 2018 2:03 pm, edited 1 time in total.

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Sprocket
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Re: Water absorption scattering values.

Post by Sprocket » Tue Aug 14, 2018 8:23 am

I found my old files hidden away on a hard drive.

Updated the scene for Luxcore. I did have to invert the absorption values though.
underwater final (luxcore bidir 16k).png

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Sharlybg
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Re: Water absorption scattering values.

Post by Sharlybg » Tue Aug 14, 2018 9:11 am

How did the 3D scene look like ? is it possible to get same result as the old one in luxcore ?
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Sprocket
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Re: Water absorption scattering values.

Post by Sprocket » Tue Aug 14, 2018 9:20 am

The scene is just a plane with ocean modifier applied to it, camera pointing straight up to the sky. I haven't been able to get any scene to render the same as old lux yet. Clamping might be affecting this scene, also I think there is a difference in the sky model used between the two.

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B.Y.O.B.
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Re: Water absorption scattering values.

Post by B.Y.O.B. » Tue Aug 14, 2018 9:26 am

Sprocket wrote:
Tue Aug 14, 2018 9:20 am
also I think there is a difference in the sky model used between the two.
The Preetham sky model was removed, it's only Hosek & Wilkie now.
However, that was also the default in old Lux, not sure if you mean this.
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Sprocket
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Re: Water absorption scattering values.

Post by Sprocket » Tue Aug 14, 2018 1:30 pm

Yes that's what I was meaning, I could not remember what they were called :D

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Sprocket
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Re: Water absorption scattering values.

Post by Sprocket » Thu Aug 16, 2018 9:37 am

I tried it again with no clamping...
underwater final (luxcore bidir 20k no clamping).png

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