Dynamic sound

[Rado1]

Is there some (maybe good and recommended) way how to continuously change properties of a played sound? For example, how to achieve playing of a sound (e.g. a simple sine) of which frequency, and possibly also other parameters, depend on position or velocity of a moving model? My case is that there are several different models and each of them needs to play such a sound. Any advice is appreciated.

[Kjell]

Hi Rado1,

Try the following approach

Code: Select all

<?xml version="1.0" encoding="iso-8859-1" ?>
<ZApplication Name="App" Caption="ZGameEditor application" CameraPosition="0 0 32">
  <OnLoaded>
    <Repeat Count="2" WhileExp="//">
      <OnIteration>
        <SpawnModel Model="Sprite"/>
      </OnIteration>
    </Repeat>
  </OnLoaded>
  <Content>
    <Model Name="Sprite">
      <Definitions>
        <Sound Name="SpriteSound" Length="1000" BaseNoteNr="58.9199" Osc1PW="0.75" Pan="0.32"/>
      </Definitions>
      <OnRender>
        <RenderSprite/>
      </OnRender>
      <OnUpdate>
        <ZExpression>
          <Expression>
<![CDATA[float velocity = clamp(sin((Sprite.Personality + 0.5) * App.Time), 0.0, 1.0);

Sprite.Rotation.Z += velocity * App.DeltaTime;

float angle = Sprite.Rotation.Z * PI * 2.0;

Sprite.Position.X = cos(angle) * 8.0;
Sprite.Position.Y = sin(angle) * 8.0;

SpriteSound.Pan = Sprite.Position.X / 24.0 + 0.5;
SpriteSound.BaseNoteNr = velocity * 60.0;
SpriteSound.Volume = clamp(velocity, 0.0, 0.5);]]>
          </Expression>
        </ZExpression>
        <PlaySound Sound="SpriteSound" ByReference="255"/>
      </OnUpdate>
    </Model>
  </Content>
</ZApplication>

K

[Rado1]

Hi Kjell, that's it, thanks!