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Human warm blood scattering, absorption, viscosity
Posted: Thu Sep 03, 2009 12:06 am
by Meelis
Hi
Does anybody know graphics of scattering and absorption values for human blood.
And warm blood ~37c viscosity.
I have 1 graphic of absorption.
-------
Edit
Some data
g from
table 3. average cosine in indigo
0.91
μs from
tabel 3. i belive average Scattering coefficient
13440
μa from
tabel 3. absorption coefficient
10220
n from
table 1. IOR average
~1.3525
a from
table 2. albedo reflectance
0.5681
rd from
table 2. diffuse reflectance
0.007
Tabulated Absorption values (350-750 nm) of s4 blood.
- 811.29
840.32
809.73
896.77
791.93
701.61
646.77
687.10
722.62
711.33
469.38
309.70
245.18
177.43
154.85
148.40
145.17
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edit 2
Average human
blood viscosity @ 37c = 4.363 mPa.s
(3.26 +/- 0.43, 4.37 +/- 0.60, and 5.46 +/- 0.84 mPa.s)
Re: Human warm blood scattering, absorption, viscosity
Posted: Thu Sep 03, 2009 8:18 pm
by Zom-B
interesting numbers you got here
some finalized Material for the database would be some nice result out of this!
My test with this number result in a quite dark material... setting the SSS to 13440 on uniform is nothing Indigo likes speed wise...
Re: Human warm blood scattering, absorption, viscosity
Posted: Thu Sep 03, 2009 9:26 pm
by Meelis
Maybe without SSS or lower it 3x 10x 100x.
I test it soon.
Re: Human warm blood scattering, absorption, viscosity
Posted: Fri Sep 04, 2009 12:53 am
by Zom-B
here is a example with the tabulated values of you, and SSS set to 134.4 uniform
- blood.jpg (22.3 KiB) Viewed 9291 times
Re: Human warm blood scattering, absorption, viscosity
Posted: Fri Sep 04, 2009 12:59 am
by PureSpider
Maybe test it with a thin layer of blood... blood gets pretty opaque and dark when it's that "thick"
Re: Human warm blood scattering, absorption, viscosity
Posted: Fri Sep 04, 2009 1:37 am
by fused
PureSpider wrote:Maybe test it with a thin layer of blood... blood gets pretty opaque and dark when it's that "thick"
+1
Re: Human warm blood scattering, absorption, viscosity
Posted: Fri Sep 04, 2009 4:01 am
by Meelis
Yes Blood optical depth is ~2mm (0.002m) its really dark.
But thinn layer is light.
It's on water simulation object so slimmer and a bit wrong, too light. (will try right viscosity)
And its on air and some of it below ground because low ground resolutsion.
Code: Select all
<?xml version="1.0" encoding="utf-8"?>
<scenedata>
<medium>
<name>SSS-Transparancy</name>
<precedence>8</precedence>
<basic>
<ior>1.3525</ior>
<cauchy_b_coeff>0</cauchy_b_coeff>
<absorption_coefficient_spectrum>
<regular_tabulated>
<start_wavelength>0.35E-06</start_wavelength>
<end_wavelength>0.75E-06</end_wavelength>
<num_values>17</num_values>
<values>
811.29
840.32
809.73
896.77
791.93
701.61
646.77
687.10
722.62
711.33
469.38
309.70
245.18
177.43
154.85
148.40
145.17
</values>
</regular_tabulated>
</absorption_coefficient_spectrum>
<subsurface_scattering>
<scattering_coefficient_spectrum>
<uniform>
<value>13440</value>
</uniform>
</scattering_coefficient_spectrum>
<phase_function>
<uniform/>
</phase_function>
</subsurface_scattering>
</basic>
</medium>
<material>
<name>SSS-Transparancy</name>
<specular>
<transparent>true</transparent>
<internal_medium_name>SSS-Transparancy</internal_medium_name>
</specular>
</material>
<material>
<name>Reflection</name>
<phong>
<exponent>
<constant>7000</constant>
</exponent>
<ior>1.38</ior>
<diffuse_albedo>
<constant><rgb>
<rgb>0.357 0.020 0.012</rgb>
<gamma>2.2</gamma>
</rgb></constant>
</diffuse_albedo>
</phong>
</material>
<material>
<name>Blood.001</name>
<blend>
<a_name>SSS-Transparancy</a_name>
<b_name>Reflection</b_name>
<step_blend>false</step_blend>
<blend>
<constant>0.1</constant>
</blend>
</blend>
</material>
</scenedata>
Re: Human warm blood scattering, absorption, viscosity
Posted: Fri Sep 04, 2009 7:25 pm
by Meelis
Some data
Blood viscosity 4.363 mPa.s = 0.004363 Pa.s
In blender viscosity = (viscosity) / (density kg/m3)
-> 0.004363 / 1060 = 4.116*10-6