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The Solid, Porous Medium, Biological Tissue, Building Material, and Shape Memory Alloy nodes define opaque domains.
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The opacity setting is used when the Radiation direction is defined by Opacity controlled in surface-to-surface boundary features (Diffuse Mirror (Surface-to-Surface Radiation Interface), Diffuse Surface (Surface-to-Surface Radiation Interface), Prescribed Radiosity (Surface-to-Surface Radiation Interface), and Opaque Surface (Surface-to-Surface Radiation Interface)): surface-to-surface radiation propagates in non-opaque domains. Alternatively the Radiation direction can be defined using the normal orientation or on both sides of boundaries. In this case this setting is ignored. Note that on boundaries where the Semi-Transparent Surface (Surface-to-Surface Radiation Interface) is applied, the Radiation direction is Both sides, and this setting is always ignored.
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