skin is very fun! sss layers- indigo 07 test 2

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oodmb
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paper

Post by oodmb » Sun Jan 21, 2007 4:44 pm

odd, i cant seem to find a free paper for the one in 2006.
is http://graphics.ucsd.edu/~henrik/papers/skin_bssrdf/ the one your refering to?
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Zom-B
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Re: paper

Post by Zom-B » Sun Jan 21, 2007 5:00 pm

oodmb wrote:odd, i cant seem to find a free paper for the one in 2006.
is http://graphics.ucsd.edu/~henrik/papers/skin_bssrdf/ the one your refering to?
Check out this...
polygonmanufaktur.de

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OnoSendai
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Post by OnoSendai » Sun Jan 21, 2007 6:07 pm

Anyone want to do the 'fun' job of tabulating the data in figure 1 of 'A Spectral BSSRDF for Shading Human Skin'.
I need the Deoxy-hemoglobin and Oxy-hemoglobin curves in particular, at better than 20 nm resolution :)

Logarithmic or linear values are fine.

*looks around hopefully*

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oodmb
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hmm

Post by oodmb » Sun Jan 21, 2007 6:34 pm

hmm why not?

maybe i'll get some sort of school credit from my physics teachers :)

i'll have it to you in about maybe a week and a half at most

Edit: now that i realize that "figure 1" != "table 1", i know what your talking about. maybe more like 2-3 days.
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OnoSendai
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Post by OnoSendai » Sun Jan 21, 2007 6:57 pm

Hehe.. yeah, it's a pretty easy job, just boring.
Better yet would be to find the actual source data :)

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Post by oodmb » Sun Jan 21, 2007 7:03 pm

i hear there are some parapsychologist studing tesla's memory who have created a device that prints images directly from thaughts. i bet if you could find one of them you can think about the graph realy hard and it will print a table for you

or, i could just use maple
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Post by OnoSendai » Sun Jan 21, 2007 7:18 pm

I think you're misunderstanding what i'm after... don't worry, i'll do it myself.

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oodmb
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Post by oodmb » Sun Jan 21, 2007 7:23 pm

i am pretty sure i know what you mean,
but if its a boring task it can be made interesting by overcomplicating it and wrighting a program that does it.

what i misunderstand is not you, but maple (the version for windows 3). and apparently i am not alone in that.

being ocd as i am, turning that qualifies as fun for me and i would be more than happy to do it for you.
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Post by Maluminas » Mon Jan 22, 2007 3:18 am

Ono, i know what you mean. Do you want the absorbance/transmittance of hemoglobin/oxyhemoglobin at different wavelengths (interval of 20nm)? I studied spectrometry pretty front top to bottom. I could do if if you havent already.

EDIT: The graph is in absorption coeff, but the task is pretty much the same lol.

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Post by OnoSendai » Mon Jan 22, 2007 3:49 am

What I wanted was the height of the Deoxy-hemoglobin and Oxy-hemoglobin curves, at sufficient x resolution so that i reconstruct them reasonably accurately. I've entered the data at 10nm intervals now, which should do.

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oodmb
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10 nm

Post by oodmb » Mon Jan 22, 2007 5:31 am

ok, well i was about half way into entering the data at 10 nm using the graphing methods of photoshop when i had a bout between sleep and sleep prevailed.
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Post by OnoSendai » Mon Jan 22, 2007 5:38 am

Here's a test, just a single dermis medium on this one:

Image

Note that all the colour comes from the absorption and scattering coefficients varying with wavelength :)

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Post by domparis » Mon Jan 22, 2007 6:46 am

Very promissing, good progression, did you plan to model your shader as a multi layered system like other renderer (mentalray, renderman) since it's more practical than using layers of polygons ?

Thanks to pointing us to the latest jenssen research he never stop and the result is outstanding !!

Don

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oodmb
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hand model

Post by oodmb » Mon Jan 22, 2007 1:13 pm

ono, dont use a model of the hand to test the SSS. from what i have read in virutaly every paper, the layer examples that they give for skin are based off of data taken from the face. the skin around hands has different controbution and thickness of layers. in the palm of the hand, there is often a coule of extra of dead skin because the hands are used so often and develop a calous like layer. the bumps in the skin on the hand follow very different patterns from the bumps in other parts of the body. (thumb print as compared to cell print). above the skin the ratio of water to oil is higher but rather than smoothing itself over the whole surface like it does on other parts of the body, it pools into the groovs on the hand creating a sparkly effect. below that there is a higher concentration of capillaries and they are larger.
the top layers on the back of the hand are much more like the ones on the face, but the veins and arteries pop and thus the thickness of the top layers vary in a pattern that is highly noticable.

here are some sites with head scans
http://www.farfieldtechnology.com/download/
http://www.cyberware.com/products/scanners/index.html

if you want, you could use the model i have posted here. its blender and has an ok topology, you might not have as many problems with it as you would have with a 3d scan.
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Post by OnoSendai » Mon Jan 22, 2007 7:36 pm

Ok, thanks oodmb, I'll try with a head scan :)

domparis:
I'll definitely have a look at Jensen's multipole approximations etc..,
but right now I just want to get the full simulation working, speed be damned.

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