Game Development Reference
In-Depth Information
angle needs to be in radians for the trigonometric functions to work. That's why we trans-
form the angle from degrees to radians using the formula:
The final property which can be set to the Listener global volume. This can be done
by calling Listener::setGlobalVolume() . The function expects float in the
range [0…100]. It combines that value with the volume from each individual sound to cal-
culate the final volume.
To finish the code for the listener, there are Listener::get*() functions for each of
the properties covered in this section.
Audio sources
We covered the first part of the sound environment—the Listener actor, which is re-
sponsible for listening to the sounds being played in the environment. However, without
any sounds being played, there is little point in having Listener . In this section, we
will explore the functionality of the SoundSource class with regards to sound spatializ-
Every mono SoundSource is spatialized by default. If we do not touch any of the prop-
erties of Listener and SoundSource they remain at the same place, and it will ap-
pear that the sources play at full volume. However, once we start moving Listener
from the origin (0; 0; 0), we start getting sounds which are fading away and disappearing.
This is not ideal if we just want to play a non-spatialized sound. We will explore ways of
dealing with this issue in this section.
The most important property of any SoundSource instance is its position. The pos-
ition is the main factor which determines how loud and from which direction the source
will be played. We can set the position of SoundSource by calling
SoundSource::setPosition() . This is very similar to the Listener class as it
expects a 3D vector. We will use the z = 0 convention here as well:
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