Layer Opacity (Surface-to-Surface Radiation Interface)
This subnode enables to define the opacity of a boundary. When the boundary represents a thin layer, this subnode can be used to specify the in-depth opacity of the layer, independently on the opacity at the surface of the layer when using the Diffuse Mirror (Surface-to-Surface Radiation Interface), Diffuse Surface (Surface-to-Surface Radiation Interface), and Opaque Surface (Surface-to-Surface Radiation Interface) nodes.
When several spectral bands are defined, the opacity can be set for all or only a selection of wavelengths.
Opacity
Depending on the Wavelength dependence of radiative properties defined in the Radiation Settings section of the physics interface settings, different sections display underneath:
When Wavelength dependence of radiative properties is set to Constant, select Opaque (default) or Transparent to set the layer’s opacity type.
When Wavelength dependence of radiative properties is set to Solar and ambient or Multiple spectral bands:
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When Opacity is set to User defined for all bands (default), set the opacity of the layer for all bands by selecting Opaque (default) or Transparent. Use this option if the transparency or opacity properties of the material are not wavelength dependent.
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When Opacity is set to User defined for each band, set the opacity for each spectral band by selecting the corresponding check box in the Opaque column of the table. By default the check box is selected for all spectral bands. Defining an opacity for each spectral band makes it possible to build models where the transparency or opacity properties of the material defers between spectral bands.
Location in User Interface
Context Menus
Surface-to-Surface Radiation>Diffuse Mirror>Layer Opacity
Surface-to-Surface Radiation>Diffuse Surface>Layer Opacity
Surface-to-Surface Radiation>Prescribed Radiosity>Layer Opacity
Ribbon
Physics tab with Surface-to-Surface Radiation selected in the model tree:
Surface-to-Surface Radiation>Diffuse Surface>Layer Opacity