Making sound-reactive particles

In this recipe, we will show an example of audio visualization based on audio-reactive particles.

Getting ready

Save your favorite music piece in assets folder with the name music.mp3.

Please refer to Chapter 6, Adding a Tail to Our Particles, for instructions on how to draw particles with a tile.

How to do it…

We will create a sample audio-reactive visualization using the following steps:

1. Add the following necessary header files:

   #include "cinder/Rand.h"
   #include "cinder/MayaCamUI.h"
   #include "cinder/audio/Io.h"
   #include "cinder/audio/Output.h"
   #include "cinder/audio/FftProcessor.h"
   #include "cinder/audio/PcmBuffer.h"
   #include "ParticleSystem.h"

2. Add the following members for audio playback and analysis:

   audio::TrackRef mTrack;
   audio::PcmBuffer32fRef mPcmBuffer;
   float beatForce;
   float beatSensitivity;
   float avgLvlOld;
   float randAngle;

3. Add the following members for particle simulation:

   ParticleSystem mParticleSystem;
   Vec3f   attrPosition;
   float attrFactor;
   CameraPersp...