How to use

setGravity

method

in

com.jme3.effect.ParticleEmitter

result.setGravity(-acc.get(0).floatValue(), -acc.get(1).floatValue(), -acc.get(2).floatValue());

@Override
public void simpleInitApp() {
  emit = new ParticleEmitter("Emitter", Type.Triangle, 300);
  emit.setGravity(0, 0, 0);
  emit.getParticleInfluencer().setVelocityVariation(1);
  emit.setLowLife(1);
  emit.setHighLife(1);
  emit.getParticleInfluencer()
      .setInitialVelocity(new Vector3f(0, .5f, 0));
  emit.setImagesX(15);
  Material mat = new Material(assetManager, "Common/MatDefs/Misc/Particle.j3md");
  mat.setTexture("Texture", assetManager.loadTexture("Effects/Smoke/Smoke.png"));
  emit.setMaterial(mat);
  
  rootNode.attachChild(emit);
  
  inputManager.addListener(new ActionListener() {
    
    public void onAction(String name, boolean isPressed, float tpf) {
      if ("setNum".equals(name) && isPressed) {
        emit.setNumParticles(1000);
      }
    }
  }, "setNum");
  
  inputManager.addMapping("setNum", new KeyTrigger(KeyInput.KEY_SPACE));
}

@Override
public void simpleInitApp() {
  ParticleEmitter emit = new ParticleEmitter("Emitter", Type.Triangle, 200);
  emit.setShape(new EmitterSphereShape(Vector3f.ZERO, 1f));
  emit.setGravity(0, 0, 0);
  emit.setLowLife(5);
  emit.setHighLife(10);
  emit.getParticleInfluencer().setInitialVelocity(new Vector3f(0, 0, 0));
  emit.setImagesX(15);
  Material mat = new Material(assetManager, "Common/MatDefs/Misc/Particle.j3md");
  mat.setTexture("Texture", assetManager.loadTexture("Effects/Smoke/Smoke.png"));
  emit.setMaterial(mat);
  ParticleEmitter emit2 = emit.clone();
  emit2.move(3, 0, 0);
  
  rootNode.attachChild(emit);
  rootNode.attachChild(emit2);
  
  ParticleEmitter emit3 = BinaryExporter.saveAndLoad(assetManager, emit);
  emit3.move(-3, 0, 0);
  rootNode.attachChild(emit3);
}

private void createSpark(){
  spark = new ParticleEmitter("Spark", Type.Triangle, 30 * COUNT_FACTOR);
  spark.setStartColor(new ColorRGBA(1f, 0.8f, 0.36f, (float) (1.0f / COUNT_FACTOR_F)));
  spark.setEndColor(new ColorRGBA(1f, 0.8f, 0.36f, 0f));
  spark.setStartSize(.5f);
  spark.setEndSize(.5f);
  spark.setFacingVelocity(true);
  spark.setParticlesPerSec(0);
  spark.setGravity(0, 5, 0);
  spark.setLowLife(1.1f);
  spark.setHighLife(1.5f);
  spark.getParticleInfluencer().setInitialVelocity(new Vector3f(0, 20, 0));
  spark.getParticleInfluencer().setVelocityVariation(1);
  spark.setImagesX(1);
  spark.setImagesY(1);
  Material mat = new Material(assetManager, "Common/MatDefs/Misc/Particle.j3md");
  mat.setTexture("Texture", assetManager.loadTexture("Effects/Explosion/spark.png"));
  spark.setMaterial(mat);
  explosionEffect.attachChild(spark);
}

fire.setStartSize(0.6f);
fire.setEndSize(0.01f);
fire.setGravity(0, -0.3f, 0);
fire.setLowLife(0.5f);
fire.setHighLife(3f);
smoke.setStartSize(3f);
smoke.setEndSize(5f);
smoke.setGravity(0, -0.001f, 0);
smoke.setLowLife(100f);
smoke.setHighLife(100f);

  private void createShockwave(){
    shockwave = new ParticleEmitter("Shockwave", Type.Triangle, 1 * COUNT_FACTOR);
//        shockwave.setRandomAngle(true);
    shockwave.setFaceNormal(Vector3f.UNIT_Y);
    shockwave.setStartColor(new ColorRGBA(.48f, 0.17f, 0.01f, (float) (.8f / COUNT_FACTOR_F)));
    shockwave.setEndColor(new ColorRGBA(.48f, 0.17f, 0.01f, 0f));

    shockwave.setStartSize(0f);
    shockwave.setEndSize(7f);

    shockwave.setParticlesPerSec(0);
    shockwave.setGravity(0, 0, 0);
    shockwave.setLowLife(0.5f);
    shockwave.setHighLife(0.5f);
    shockwave.getParticleInfluencer()
        .setInitialVelocity(new Vector3f(0, 0, 0));
    shockwave.getParticleInfluencer().setVelocityVariation(0f);
    shockwave.setImagesX(1);
    shockwave.setImagesY(1);
    Material mat = new Material(assetManager, "Common/MatDefs/Misc/Particle.j3md");
    mat.setTexture("Texture", assetManager.loadTexture("Effects/Explosion/shockwave.png"));
    shockwave.setMaterial(mat);
    explosionEffect.attachChild(shockwave);
  }

private void createFire() {
  /**
   * Uses Texture from jme3-test-data library!
   */
  ParticleEmitter fire = new ParticleEmitter("Emitter", ParticleMesh.Type.Triangle, 30);
  Material mat_red = new Material(assetManager, "Common/MatDefs/Misc/Particle.j3md");
  mat_red.setTexture("Texture", assetManager.loadTexture("Effects/Explosion/flame.png"));
  fire.setMaterial(mat_red);
  fire.setImagesX(2);
  fire.setImagesY(2); // 2x2 texture animation
  fire.setEndColor(new ColorRGBA(1f, 0f, 0f, 1f));   // red
  fire.setStartColor(new ColorRGBA(1f, 1f, 0f, 0.5f)); // yellow
  fire.getParticleInfluencer().setInitialVelocity(new Vector3f(0, 2, 0));
  fire.setStartSize(10f);
  fire.setEndSize(1f);
  fire.setGravity(0, 0, 0);
  fire.setLowLife(0.5f);
  fire.setHighLife(1.5f);
  fire.getParticleInfluencer().setVelocityVariation(0.3f);
  fire.setLocalTranslation(-600, 50, 300);
  fire.setQueueBucket(Bucket.Translucent);
  rootNode.attachChild(fire);
}

  private void createSmokeTrail(){
    smoketrail = new ParticleEmitter("SmokeTrail", Type.Triangle, 22 * COUNT_FACTOR);
    smoketrail.setStartColor(new ColorRGBA(1f, 0.8f, 0.36f, (float) (1.0f / COUNT_FACTOR_F)));
    smoketrail.setEndColor(new ColorRGBA(1f, 0.8f, 0.36f, 0f));
    smoketrail.setStartSize(.2f);
    smoketrail.setEndSize(1f);

//        smoketrail.setShape(new EmitterSphereShape(Vector3f.ZERO, 1f));
    smoketrail.setFacingVelocity(true);
    smoketrail.setParticlesPerSec(0);
    smoketrail.setGravity(0, 1, 0);
    smoketrail.setLowLife(.4f);
    smoketrail.setHighLife(.5f);
    smoketrail.getParticleInfluencer()
        .setInitialVelocity(new Vector3f(0, 12, 0));
    smoketrail.getParticleInfluencer().setVelocityVariation(1);
    smoketrail.setImagesX(1);
    smoketrail.setImagesY(3);
    Material mat = new Material(assetManager, "Common/MatDefs/Misc/Particle.j3md");
    mat.setTexture("Texture", assetManager.loadTexture("Effects/Explosion/smoketrail.png"));
    smoketrail.setMaterial(mat);
    explosionEffect.attachChild(smoketrail);
  }

private void prepareEffect(AssetManager assetManager) {
  int COUNT_FACTOR = 1;
  float COUNT_FACTOR_F = 1f;
  effect = new ParticleEmitter("Flame", Type.Triangle, 32 * COUNT_FACTOR);
  effect.setSelectRandomImage(true);
  effect.setStartColor(new ColorRGBA(1f, 0.4f, 0.05f, (float) (1f / COUNT_FACTOR_F)));
  effect.setEndColor(new ColorRGBA(.4f, .22f, .12f, 0f));
  effect.setStartSize(1.3f);
  effect.setEndSize(2f);
  effect.setShape(new EmitterSphereShape(Vector3f.ZERO, 1f));
  effect.setParticlesPerSec(0);
  effect.setGravity(0, -5f, 0);
  effect.setLowLife(.4f);
  effect.setHighLife(.5f);
  effect.getParticleInfluencer()
      .setInitialVelocity(new Vector3f(0, 7, 0));
  effect.getParticleInfluencer().setVelocityVariation(1f);
  effect.setImagesX(2);
  effect.setImagesY(2);
  Material mat = new Material(assetManager, "Common/MatDefs/Misc/Particle.j3md");
  mat.setTexture("Texture", assetManager.loadTexture("Effects/Explosion/flame.png"));
  effect.setMaterial(mat);
}

private void createRoundSpark(){
  roundspark = new ParticleEmitter("RoundSpark", EMITTER_TYPE, 20 * COUNT_FACTOR);
  roundspark.setStartColor(new ColorRGBA(1f, 0.29f, 0.34f, (float) (1.0 / COUNT_FACTOR_F)));
  roundspark.setEndColor(new ColorRGBA(0, 0, 0, (float) (0.5f / COUNT_FACTOR_F)));
  roundspark.setStartSize(1.2f);
  roundspark.setEndSize(1.8f);
  roundspark.setShape(new EmitterSphereShape(Vector3f.ZERO, 2f));
  roundspark.setParticlesPerSec(0);
  roundspark.setGravity(0, -.5f, 0);
  roundspark.setLowLife(1.8f);
  roundspark.setHighLife(2f);
  roundspark.getParticleInfluencer()
      .setInitialVelocity(new Vector3f(0, 3, 0));
  roundspark.getParticleInfluencer().setVelocityVariation(.5f);
  roundspark.setImagesX(1);
  roundspark.setImagesY(1);
  Material mat = new Material(assetManager, "Common/MatDefs/Misc/Particle.j3md");
  mat.setTexture("Texture", assetManager.loadTexture("Effects/Explosion/roundspark.png"));
  mat.setBoolean("PointSprite", POINT_SPRITE);
  roundspark.setMaterial(mat);
  explosionEffect.attachChild(roundspark);
}

private void createFlame(){
  flame = new ParticleEmitter("Flame", EMITTER_TYPE, 32 * COUNT_FACTOR);
  flame.setSelectRandomImage(true);
  flame.setStartColor(new ColorRGBA(1f, 0.4f, 0.05f, (float) (1f / COUNT_FACTOR_F)));
  flame.setEndColor(new ColorRGBA(.4f, .22f, .12f, 0f));
  flame.setStartSize(1.3f);
  flame.setEndSize(2f);
  flame.setShape(new EmitterSphereShape(Vector3f.ZERO, 1f));
  flame.setParticlesPerSec(0);
  flame.setGravity(0, -5, 0);
  flame.setLowLife(.4f);
  flame.setHighLife(.5f);
  flame.getParticleInfluencer().setInitialVelocity(new Vector3f(0, 7, 0));
  flame.getParticleInfluencer().setVelocityVariation(1f);
  flame.setImagesX(2);
  flame.setImagesY(2);
  Material mat = new Material(assetManager, "Common/MatDefs/Misc/Particle.j3md");
  mat.setTexture("Texture", assetManager.loadTexture("Effects/Explosion/flame.png"));
  mat.setBoolean("PointSprite", POINT_SPRITE);
  flame.setMaterial(mat);
  explosionEffect.attachChild(flame);
}

  private void createDebris(){
    debris = new ParticleEmitter("Debris", Type.Triangle, 15 * COUNT_FACTOR);
    debris.setSelectRandomImage(true);
    debris.setRandomAngle(true);
    debris.setRotateSpeed(FastMath.TWO_PI * 4);
    debris.setStartColor(new ColorRGBA(1f, 0.59f, 0.28f, (float) (1.0f / COUNT_FACTOR_F)));
    debris.setEndColor(new ColorRGBA(.5f, 0.5f, 0.5f, 0f));
    debris.setStartSize(.2f);
    debris.setEndSize(.2f);

//        debris.setShape(new EmitterSphereShape(Vector3f.ZERO, .05f));
    debris.setParticlesPerSec(0);
    debris.setGravity(0, 12f, 0);
    debris.setLowLife(1.4f);
    debris.setHighLife(1.5f);
    debris.getParticleInfluencer()
        .setInitialVelocity(new Vector3f(0, 15, 0));
    debris.getParticleInfluencer().setVelocityVariation(.60f);
    debris.setImagesX(3);
    debris.setImagesY(3);
    Material mat = new Material(assetManager, "Common/MatDefs/Misc/Particle.j3md");
    mat.setTexture("Texture", assetManager.loadTexture("Effects/Explosion/Debris.png"));
    debris.setMaterial(mat);
    explosionEffect.attachChild(debris);
  }

private void createFlash(){
  flash = new ParticleEmitter("Flash", EMITTER_TYPE, 24 * COUNT_FACTOR);
  flash.setSelectRandomImage(true);
  flash.setStartColor(new ColorRGBA(1f, 0.8f, 0.36f, (float) (1f / COUNT_FACTOR_F)));
  flash.setEndColor(new ColorRGBA(1f, 0.8f, 0.36f, 0f));
  flash.setStartSize(.1f);
  flash.setEndSize(3.0f);
  flash.setShape(new EmitterSphereShape(Vector3f.ZERO, .05f));
  flash.setParticlesPerSec(0);
  flash.setGravity(0, 0, 0);
  flash.setLowLife(.2f);
  flash.setHighLife(.2f);
  flash.getParticleInfluencer()
      .setInitialVelocity(new Vector3f(0, 5f, 0));
  flash.getParticleInfluencer().setVelocityVariation(1);
  flash.setImagesX(2);
  flash.setImagesY(2);
  Material mat = new Material(assetManager, "Common/MatDefs/Misc/Particle.j3md");
  mat.setTexture("Texture", assetManager.loadTexture("Effects/Explosion/flash.png"));
  mat.setBoolean("PointSprite", POINT_SPRITE);
  flash.setMaterial(mat);
  explosionEffect.attachChild(flash);
}

fire.setStartSize(1.5f);
fire.setEndSize(0.1f);
fire.setGravity(0, 0, 0);
fire.setLowLife(1f);
fire.setHighLife(3f);
debris.getParticleInfluencer().setInitialVelocity(new Vector3f(0, 4, 0));
debris.setStartColor(ColorRGBA.White);
debris.setGravity(0, 6, 0);
debris.getParticleInfluencer().setVelocityVariation(.60f);
rootNode.attachChild(debris);

  private void prepareEffect() {
    int COUNT_FACTOR = 1;
    float COUNT_FACTOR_F = 1f;
    effect = new ParticleEmitter("Flame", Type.Triangle, 32 * COUNT_FACTOR);
    effect.setSelectRandomImage(true);
    effect.setStartColor(new ColorRGBA(1f, 0.4f, 0.05f, (float) (1f / COUNT_FACTOR_F)));
    effect.setEndColor(new ColorRGBA(.4f, .22f, .12f, 0f));
    effect.setStartSize(1.3f);
    effect.setEndSize(2f);
    effect.setShape(new EmitterSphereShape(Vector3f.ZERO, 1f));
    effect.setParticlesPerSec(0);
    effect.setGravity(0, -5, 0);
    effect.setLowLife(.4f);
    effect.setHighLife(.5f);
    effect.getParticleInfluencer()
        .setInitialVelocity(new Vector3f(0, 7, 0));
    effect.getParticleInfluencer().setVelocityVariation(1f);
    effect.setImagesX(2);
    effect.setImagesY(2);
    Material mat = new Material(assetManager, "Common/MatDefs/Misc/Particle.j3md");
    mat.setTexture("Texture", assetManager.loadTexture("Effects/Explosion/flame.png"));
    effect.setMaterial(mat);
//        effect.setLocalScale(100);
    rootNode.attachChild(effect);
  }
 

emit.setShape(new EmitterBoxShape(new Vector3f(-1.8f, -1.8f, -1.8f),
                 new Vector3f(1.8f, 1.8f, 1.8f)));
emit.setGravity(0, 0, 0);
emit.setLowLife(60);
emit.setHighLife(60);

fire.setStartSize(0.6f);
fire.setEndSize(0.1f);
fire.setGravity(0, 0, 0);
fire.setLowLife(0.5f);
fire.setHighLife(1.5f);

emitter.setGravity(0, element.getMass() * element.getAirFriction(), 0);
emitter.setLowLife(element.getMinHp() / 10f);
emitter.setHighLife(element.getMaxHp() / 10f);

private void prepareEffect(AssetManager assetManager) {
  int COUNT_FACTOR = 1;
  float COUNT_FACTOR_F = 1f;
  effect = new ParticleEmitter("Flame", Type.Triangle, 32 * COUNT_FACTOR);
  effect.setSelectRandomImage(true);
  effect.setStartColor(new ColorRGBA(1f, 0.4f, 0.05f, (float) (1f / COUNT_FACTOR_F)));
  effect.setEndColor(new ColorRGBA(.4f, .22f, .12f, 0f));
  effect.setStartSize(1.3f);
  effect.setEndSize(2f);
  effect.setShape(new EmitterSphereShape(Vector3f.ZERO, 1f));
  effect.setParticlesPerSec(0);
  effect.setGravity(0, -5f, 0);
  effect.setLowLife(.4f);
  effect.setHighLife(.5f);
  effect.setInitialVelocity(new Vector3f(0, 7, 0));
  effect.setVelocityVariation(1f);
  effect.setImagesX(2);
  effect.setImagesY(2);
  Material mat = new Material(assetManager, "Common/MatDefs/Misc/Particle.j3md");
  mat.setTexture("Texture", assetManager.loadTexture("Effects/Explosion/flame.png"));
  effect.setMaterial(mat);
}