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<?xml version="1.0" encoding="utf-8" ?>
<scenedata>
<medium>
<name>bubble_medium</name>
<precedence>10</precedence>
<basic>
<ior>1</ior>
<cauchy_b_coeff>0</cauchy_b_coeff>
<absorption_coefficient_spectrum>
<rgb>
<rgb>0.24 0.9 10</rgb>
<gamma>1</gamma>
</rgb>
</absorption_coefficient_spectrum>
<subsurface_scattering>
<scattering_coefficient_spectrum>
<uniform>
<value>1000</value>
</uniform>
</scattering_coefficient_spectrum>
<phase_function>
<uniform />
</phase_function>
</subsurface_scattering>
</basic>
</medium>
<material>
<name>surface</name>
<phong>
<specular_reflectivity>
<shader>
<shader>
<![CDATA[def thickness() real:
4000.0 * (1.0 + 0.25 * noise(getTexCoords(0)*2.0))
def cos_n(real cosi, real n) real:
sqrt ( 1.0 - (1.0 - cosi*cosi ) / (n*n) )
def eval(real wavelen, vec3 pos) real :
pow ( sin (
(
1.0 / cos_n(minCosTheta(),1.50)
+ 1.0 / cos_n(maxCosTheta(),1.50) )
* ( thickness() / wavelen)
) , 2.0 )]]>
</shader>
</shader>
</specular_reflectivity>
<exponent>
<constant>100</constant>
</exponent>
<layer>0</layer>
<fresnel_scale>1</fresnel_scale>
<ior>2</ior>
<nk_data />
</phong>
</material>
<material>
<name>inside</name>
<specular>
<internal_medium_name>bubble_medium</internal_medium_name>
<transparent>true</transparent>
<layer>0</layer>
</specular>
</material>
<material>
<name>pearl</name>
<blend>
<a_name>surface</a_name>
<b_name>inside</b_name>
<blend>
<constant>0.6</constant>
</blend>
<step_blend>false</step_blend>
</blend>
</material>
</scenedata>
