The Ray Properties node is added by default. Only one instance of this node can exist for each physics interface. The Ray Properties node defines the equations for ray propagation and also includes the input for the ray frequency.

This section is shown when the Allow frequency distributions at release features checkbox is cleared in the physics interface Ray Release and Propagation section. Otherwise the ray frequency is controlled separately by each ray release feature.

Select the Ray frequency as User defined (the default) or as announced by another feature. If the Release from Pressure Field or the Release from Exterior Field Calculation features are present in the model, the Ray frequency is automatically locked to the frequency of the source. The drop down becomes locked (grayed out).

For the User defined option enter a Ray frequency f (SI unit: Hz) here. The default is 1000 Hz. In typical room acoustics simulations the frequency will correspond to the center frequency of the analyzed frequency band. See Impulse Response Plot and Receiver Dataset.