11 Playing audio: Sound effects and music

This chapter covers

Importing and playing audio clips for various sound effects
Using 2D sounds for the UI and 3D sounds in the scene
Modulating the volume of all sounds when they play
Playing background music while the game is being played
Fading in and out between different background tunes

Although graphics get most of the attention when it comes to content in video games, audio is crucial too. Most games play background music and have sound effects. Accordingly, Unity has audio functionality so that you can put sound effects and music into your games. Unity can import and play a variety of audio file formats, adjust the volume of sounds, and even handle sounds playing from a specific position within the scene.

NOTE

Audio is handled the same way for both 2D and 3D games. Although the sample project in this chapter is a 3D game, everything we’ll do applies to 2D games as well.

11.1 Importing sound effects

11.1.1 Supported file formats

11.1.2 Importing audio files

11.2 Playing sound effects

11.2.1 Explaining what’s involved: Audio clip vs. source vs. listener

11.2.2 Assigning a looping sound

11.2.3 Triggering sound effects from code

11.3 Using the audio control interface

11.3.1 Setting up the central AudioManager

11.3.2 Volume control UI

11.3.3 Playing UI sounds

11.4 Adding background music

11.4.1 Playing music loops

11.4.2 Controlling music volume separately

11.4.3 Fading between songs