absorption layer transmittance test

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Musorgki
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absorption layer transmittance test

Post by Musorgki » Wed Dec 02, 2009 6:50 pm

Messing with the absorption layer transmittance parameter.
bluebar_phong.png
phong material with blue-bar-on-white texture map
bluebar_phong.png (262.7 KiB) Viewed 5041 times
bluebar_sss.png
sss material with blue-bar-on-white texture map
bluebar_sss.png (278.21 KiB) Viewed 5039 times
In the sss version, notice how the blue scatters below the surface - its a thing of beauty & wonder!

The sss version is darker, but I assume that is from the scattering,
since I've never been able to get a pure white sss material.

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OnoSendai
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Re: absorption layer transmittance test

Post by OnoSendai » Wed Dec 02, 2009 7:22 pm

Wow, cool test.
If anyone is interested, absorption layer transmittance is perfect for creating things like imperfections on human skin (freckles etc..), when applied to a glossy transparent material. hint hint.

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suvakas
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Re: absorption layer transmittance test

Post by suvakas » Wed Dec 02, 2009 9:58 pm

Very cool !

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Whaat
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Re: absorption layer transmittance test

Post by Whaat » Fri Dec 04, 2009 2:21 am

skin test...needs tweaking but looks promising I think.
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zeitmeister
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Re: absorption layer transmittance test

Post by zeitmeister » Fri Dec 04, 2009 4:04 am

Promising!
Could you give us your sourcecode?
Cheers, David



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Whaat
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Re: absorption layer transmittance test

Post by Whaat » Fri Dec 04, 2009 4:57 am

zeitmeister wrote:Promising!
Could you give us your sourcecode?
I didn't save the IGM and now it's lost. However, these are the settings from what I recall:

Glossy Transparent
IOR=1.08
Exponent=50 (I think)
Absorption=?? (almost white, relatively low)
SSS=Uniform 300
Abs Layer Trans=Skin texture downloaded from internet with gamma=1.0 (makes it brighter)
No bump map for this test

I think that playing around with the absorption will result in different skin tones. I have no idea what the scattering value should be for skin. 300 might be too low but high SSS values really slow down Indigo so I don't like to go above 300.

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zeitmeister
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Re: absorption layer transmittance test

Post by zeitmeister » Fri Dec 04, 2009 5:29 am

Thank you!

Can't wait till fused implements it into Cindigo...
Cheers, David



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pixie
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Re: absorption layer transmittance test

Post by pixie » Fri Dec 04, 2009 5:44 am

zeitmeister wrote:Thank you!

Can't wait till fused implements it into Cindigo...
Then you'll be glad to know that he already had implemented it ;)

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OnoSendai
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Re: absorption layer transmittance test

Post by OnoSendai » Fri Dec 04, 2009 9:18 am

nice one Whaat.
However, I would recommend that the absorption layer transmittance texture only have surface-level colours, such as freckles etc.. The general pink (or equiv.) colour of the skin should come from the medium absorption colour, as in real life.

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fused
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Re: absorption layer transmittance test

Post by fused » Fri Dec 04, 2009 10:26 am

pixie wrote:
zeitmeister wrote:Thank you!

Can't wait till fused implements it into Cindigo...
Then you'll be glad to know that he already had implemented it ;)
Yeah, I did :)
I need to get that mac build out! :lol:

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zeitmeister
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Re: absorption layer transmittance test

Post by zeitmeister » Fri Dec 04, 2009 8:47 pm

Ah, that was the point...!
Jetzabbazackzack! :mrgreen:
Cheers, David



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Jambert
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Re: absorption layer transmittance test

Post by Jambert » Fri Dec 04, 2009 10:02 pm

Realy nice test

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SmartDen
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Re: absorption layer transmittance test

Post by SmartDen » Sat Dec 12, 2009 2:04 am

Musorgki wrote:Messing with the absorption layer transmittance parameter.
...
bluebar_sss.png
In the sss version, notice how the blue scatters below the surface - its a thing of beauty & wonder!

The sss version is darker, but I assume that is from the scattering,
since I've never been able to get a pure white sss material.
awesome! what's your sss material settings?
Check normals, dude!

Image
Image

Musorgki
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Re: absorption layer transmittance test

Post by Musorgki » Mon Dec 14, 2009 11:26 pm

Thanks everyone!
SmartDen wrote: awesome! what's your sss material settings?
The absorption is 0/0/0, scatter is uniform 300 & phase is uniform.
The texture itself was 255/255/255 white with a 0/0/255 blue bar,
used as the absorption_layer_transmittance in a glossy_transparent material.

When I rendered it in the material editor, I got a lot of fireflies, but
rendering with metropolis true and bidirectional & hybrid false cleared it up.

I hope that helps!

Soup
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Re: absorption layer transmittance test

Post by Soup » Wed Dec 16, 2009 10:07 am

Made this for an example.
23 hours rendering with Nick's i7 as slave :lol:
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ilogo.png
Ilogo
ilogo.png (293.53 KiB) Viewed 4185 times

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