@Override
    public void simpleUpdate(float tpf) {
        angle += tpf;
        angle %= FastMath.TWO_PI;
        float x = FastMath.cos(angle) * 2;
        float y = FastMath.sin(angle) * 2;
        emit.setLocalTranslation(x, 0, y);
    }
Particle that moves in a circle.

@author Kirill Vainer
jme3-examples/src/main/java/jme3test/effect/TestMovingParticle.java