Human warm blood scattering, absorption, viscosity

[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.


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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)

[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...

[Meelis]

Maybe without SSS or lower it 3x 10x 100x.
I test it soon.

[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 7680 times

[PureSpider]

Maybe test it with a thin layer of blood... blood gets pretty opaque and dark when it's that "thick"

[fused]

Maybe test it with a thin layer of blood... blood gets pretty opaque and dark when it's that "thick"

+1

[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>

[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