In the docs:
The Setup Tab > Editors Group (Setup Tab) > Non-sequential Component Editor > Object Properties (non-sequential component editor) > Coat/Scatter
the “Face is” description is :
Face Is This setting controls whether the face is refractive, reflective, or absorbing. The following options are available:
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“Object Default” means the face is either refractive, reflective, or absorbing, depending upon the material type defined in the NSC Editor.
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“Reflective” means the face is always reflective. The transmitted part of the light is ignored. “Reflective” assumes the surface is coated with a thick layer of aluminum, with an index of refraction of 0.7-7.0i (at 0.55um). The layer is assumed to be thick enough that no light propagates past the layer.
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“Absorbing” means the face is always absorbing.
I tried playing aournd with those parameters by setting it on a rectangular volume front face with a detector behing and a detector at 45° and a source ray at 45° incident angle with a single wavelength at 10µm , and found that :
- Face is Object default, no coating, no scattering : all power goes through
- Face is Object default, SPLIT (50/50) coating, no scattering: .5W on each detector
- Face is Reflective with no coating, no scattering: no hit behind the volume in transmission, a about .94W in reflection (so the aluminium I guess)
- Face is Reflective with SPLIT coating, no scattering: 0W transmitted, .5W reflected (so no more alumnium!!)
- Fase is Absorbing (coating disabled): 0W on each detector
