### 2.7.7. Thermal Radiation

#### 2.7.7.1. Opaque

Set an Emissivity. A blackbody exhibits perfect emission and has an Emissivity value of `1`. For details, see Opaque.

#### 2.7.7.2. Sources

For the `Discrete Transfer` and `Monte Carlo` models, radiation sources can be specified at wall boundaries. For details, see Sources (Discrete Transfer and Monte Carlo models).

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