Rays lose LF and HF energy separately based on how far they travel through air. There is an in-built air absorption formula that's based on humidity, temperature and pressure. You can adjust these values by setting a new AirAbsorption field: ```cs context.AirAbsorption = new vaudio.AirAbsorptionSettings() { HumidityPercent = 0.1f, TemperatureCelsius = 30.0f, PressurePascals = 101325.0f, }; ``` > Note that editing a specific property, e.g. `context.AirAbsorption.HumidityPercent = 0.3f` will not work. The entire `context.AirAbsorption` property must be set Air absorption is also affected by the `MetersPerUnit`, `SpeedOfSound`, `FrequencyReferenceLF` and `FrequencyReferenceHF` context settings. You can also provide custom formulas for air absorption: ```cs context.AirAbsorption = new vaudio.AirAbsorptionSettings() { CustomFormulaLF = (float distance) => { // Return how much LF energy should be lost, in the range 0.0 to 1.0 return distance / 15000.0f; }, CustomFormulaHF = (float distance) => { // Return how much HF energy should be lost, in the range 0.0 to 1.0 return distance / 2000.0f; } }; ``` You can also completely disable air absorption: ```cs context.AirAbsorption = null; ```