@Override
    public void setSpeed(float speed) {
        this.speed = speed;
    }
Sets the speed of the animation.
At speed = 1, the animation will last initialDuration seconds,
At speed = 2, the animation will last initialDuration/2...
@param speed the desired speedup factor (default=1)
jme3-core/src/main/java/com/jme3/cinematic/events/AbstractCinematicEvent.java