public void addKeyFrameScale(int keyFrameIndex, Vector3f scale) {
        Vector3f s = getScaleForFrame(keyFrameIndex);
        s.set(scale);
    }
Adds a key frame for the given scale at the given keyFrame index
@param keyFrameIndex the index at which the keyFrame must be inserted
@param scale the scale to use for this keyFrame
jme3-core/src/main/java/com/jme3/animation/AnimationFactory.java