var center = Vec3.sum(MyAvatar.position, Vec3.multiply(3, Quat.getFront(Camera.getOrientation())));
    var particleParams = {
          type: "ParticleEffect",
          position: center,
          particleRadius: .01,
          radiusSpread: 0.0,
          emitRate: 1000,
          emitSpeed: .1,
          emitAcceleration: {
                x: 0,
                y: 0,
                z: 0
          },
          speedSpread: 0.0,
          polarFinish: Math.PI,
          textures: "https://hifi-public.s3.amazonaws.com/alan/Particles/Particle-Sprite-Smoke-1.png",
          color: {
                red: 255,
                green: 0,
                blue: 255
          },
          lifespan: 5.0,
          isEmitting: true,
          lifetime: 3600, // 1 hour; just in case,
          // additiveBlending: false
    };

    var explosion1 = Entities.addEntity(particleParams);
    particleParams.position.x += .2;
    particleParams.color.red = 0;
    var explosion2 = Entities.addEntity(particleParams);
    particleParams.position.x += .2;
    particleParams.color.green = 200;
    var explosion3 = Entities.addEntity(particleParams);



    function cleanup() {
          Entities.deleteEntity(explosion1)
          Entities.deleteEntity(explosion2)
          Entities.deleteEntity(explosion3)
    }
    Script.scriptEnding.connect(cleanup);