Particle System Definition

// Spawn between 300 and 400 particles per second
partsys.emitter.spawnRateMin = 300.0f;
partsys.emitter.spawnRateMax = 400.0f;

//=====================================================================================================================
// Generators determine the initial attributes of the particles
//=====================================================================================================================

partsys.generators.add(new RandomEnergyGenerator(6, 7)); // Particles live between 6 and 7 seconds.

// For the position and velocity, use random values between a min and max coordinate value.
partsys.generators.add(new MinMaxPositionGenerator(new Vector3f(-0.2f, -0.2f, -0.2f), new Vector3f(0.2f, 0.2f, 0.2f)));
partsys.generators.add(new MinMaxVelocityGenerator(new Vector3f(-1f, 0.5f, -1f), new Vector3f(+1f, 2.0f, +1f)));

//=====================================================================================================================
// Affectors determine how the attributes change over time
//=====================================================================================================================

partsys.affectors.add(new ForwardEulerAffector());                         // enables simple physics
partsys.affectors.add(new StaticForceAffector(new Vector3f(0, 0.25f, 0))); // adds upward force
partsys.affectors.add(new DampingAffector(0.6f));              // simulates air friction

// The following defines and adds a multi-key RGBA gradient, so the colors change over time
// Note: this currently uses Vector4f, but will be changed to use Color instead
EnergyColorAffector energyColorAffector = new EnergyColorAffector();
                    energyColorAffector.gradientMap.put(6.5f, new Vector4f(0.9f, 0.9f, 0.9f, 0.8f));
                    energyColorAffector.gradientMap.put(6.4f, new Vector4f(1.0f, 1.0f, 0.3f, 1.0f));
                    energyColorAffector.gradientMap.put(5.6f, new Vector4f(1.0f, 0.2f, 0.1f, 0.0f));
                    energyColorAffector.gradientMap.put(5.0f, new Vector4f(1.0f, 0.2f, 0.1f, 0.7f));
                    energyColorAffector.gradientMap.put(2.5f, new Vector4f(0.1f, 0.1f, 0.1f, 0.0f));
                    energyColorAffector.gradientMap.put(1.0f, new Vector4f(0.1f, 0.1f, 0.1f, 1.0f));
                    energyColorAffector.gradientMap.put(0.0f, new Vector4f(0.1f, 0.1f, 0.1f, 0.0f));
partsys.affectors.add(energyColorAffector);

// In a similar fashion, the size (xyz) over time can be controlled. (Z makes no sense with billboards :P)
EnergySizeAffector energySizeAffector = new EnergySizeAffector();
                   energySizeAffector.gradientMap.put(6.5f, new Vector3f(0.01f, 0.01f, 0.01f));
                   energySizeAffector.gradientMap.put(6.2f, new Vector3f(0.1f, 0.1f, 0.1f));
                   energySizeAffector.gradientMap.put(5.0f, new Vector3f(0.0f, 0.0f, 0.0f));
                   energySizeAffector.gradientMap.put(2.5f, new Vector3f(0.01f, 0.01f, 0.01f));
                   energySizeAffector.gradientMap.put(0.0f, new Vector3f(0.7f, 0.7f, 0.7f));
partsys.affectors.add(energySizeAffector);


partsys.affectors.add(new TurbulenceAffector(2.5f)); // Adds some randomness to the motion (random forces)

// end of particle system definition