public void setSpeed(float speed) {
        this.speed = speed;
        if (blendTime > 0) {
            this.speedBlendFrom = speed;
            blendTime = Math.min(blendTime, animation.getLength() / speed);
            blendRate = 1 / blendTime;
        }
    }
@param speed Set the speed of the animation channel. The speed
is a scale value starting from 0.0, at 1.0 the animation will play
at its default speed.
jme3-core/src/main/java/com/jme3/animation/AnimChannel.java