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