Ambient Zones

Ambient Zones are an inexpensive interior/exterior ambient audio solution. Benefits of Ambient Zones include:

• Makes the transition from interior to exterior areas sound good.
• Reduces labor for audio designers, as less Sound Actors will need to be placed and iterated on inside/outside spaces.
• Reduces game systems overhead, due to a reduction of required Sound Actors to define interiors and exteriors.

Ambient Zone Settings

The settings for an Ambient Zone define how Sound Actors located inside and outside of its associated Audio Volume are altered by the player's location.

A simple example of how this works is shown below:

In the image above, the gold box around the section marked as "Inside" is an Ambient Zone volume; the two speaker icons are Sound Actors. As you can see, one Sound Actor is located inside the Ambient Zone and the other is located outside the Ambient Zone.

Here is the behavior of the Ambient Zone volume when playing in the level:

• When the player is outside of the Ambient Zone, the Sound Actor located inside the Ambient Zone will have a volume multiplier and LPF effect applied to it.
• When the player enters the Ambient Zone, the Sound Actor located inside the Ambient Zone will return to a 1.0 multiplier for volume and LPF over a specified fade time. At the same time, the Sound Actor located outside of the Ambient Zone will have a volume and LPF multiplier applied to it over a specified fade time.
• When the player exits the Ambient Zone, the Sound Actor outside the Ambient Zone will return to its previous default volume and LPF values using the previous fade time, and the Sound Actor located inside the Ambient Zone will have its volume multiplier and LPF values changed via the Ambient Zone Settings for the Ambient Zone.

You can access the Ambient Zone Settings from the Details panel of an Audio Volume by expanding it as seen below.

Creating An Ambient Zone

1. Create an Audio Volume and place two Ambient Sound Actors in the level: one inside the volume and the other outside the volume.
2. Assign a large radius looping sound to both Ambient Sound Actors.
3. In the Details panel of the Audio Volume, expand the Audio Volume properties.

4. Expand the Ambient Zone Settings to reveal its properties:

   
5. In the Ambient Zone properties, set the Exterior Volume to .5
   • This is the final volume of Ambient Sounds that are outside the Ambient Zone when the player is inside the Ambient Zone.
6. Set the Exterior LPF to .5
   • This is the final low pass filter on Ambient Sounds that are outside the Ambient Zone when the player is inside the Ambient Zone.
7. Set the Interior Volume to .2
   • This is the final volume of Ambient Sounds that are inside the Ambient Zone when the player is outside the Ambient Zone.
8. Set the Interior LPF to .2
   • This is the final low pass filter on Ambient Sounds that are inside the Ambient Zone when the player is outside the Ambient Zone.

9. Create a new Sound Class and in its properties, check Apply Ambient Volumes:

   

10. Assign the Sound Class to both the interior and exterior sounds from the Details panel of each sound:

    
11. Rebuild geometry, and enter the Audio Volume with the Ambient Zone you just set up.
    • The Ambient Sound that is outside the Ambient Zone will have its volume and low pass filter multiplied by .5
12. Exit the Audio Volume.
    • Now the Ambient Sound that was outside the Audio Volume is restored to its previous volume and LPF settings.
    • The Ambient Sound inside the Audio Volume now has a volume multiplier and LPF multiplier of .2 applied, making it very quiet.

When placing a Sound Actor inside of an Ambient Zone volume, you must rebuild the level's geometry, as this is when the check is performed on the Sound Actor to determine its location. After geometry has been rebuilt, all Ambient Zone parameters can be freely changed in the editor.