Thick foil interface law¶
Description¶

Specular material with no bulk medium and a foil law with 0.1mm blue polymer medium¶
The Foil interface law is similar to the Fresnel interface law, but it adds a dielectric
foil at the interface. The refractive indices of scene media located in front and
behind the surface are taken into account, as well as the properties of the layer. The latter is
defined by an internal dielectric function defined in the law element, and a thickness.
The polarization state of light is computed accurately by this law.
The differences with the Thin film interface law are
It uses incoherent optics instead of coherent optics in the layer. Therefore, it is more suited for layers of 0.1mm or above.
It takes into account only the real part of the layer refractive index for interface reflections. The imaginary part is only used for absorption through the layer thickness. Therefore, it is suited only for dielectric layers for which k is negligible in front of n.
This law is well suited for flat glass sheets, polymer foils, liquid films, etc…
Children Nodes¶
The foil dielectric function |
Parameters¶
name |
type |
description |
---|---|---|
thickness |
real |
The foil thickness in meters |
Ocean XML 6.1 example¶
<intlaw type="foil" name="intlaw" thickness="0.0001">
<dielectricfunc type="na" name="dielectricfunc">
<spectrum type="uniform" name="n" value="1.5235"/>
<spectrum type="rgb" name="a" rgb="5000 4000 2000" gamma="1"/>
</dielectricfunc>
</intlaw>