public void processEvent( Event event )
{
    ConstSFFloat flt = (ConstSFFloat) event.getValue( );
    float frac = (float) flt.getValue( );

    float y = (float)(4.0 * bounceHeight * frac * (1.0 - frac));

    float[] changed = new float[3];
    changed[0] = (float) 0.0;
    changed[1] = y;
    changed[2] = (float) 0.0;
    value_changedObj.setValue( changed );
}