public void setScaleInterpolator(AnimInterpolator<Vector3f> scaleInterpolator) {
        this.scaleInterpolator = scaleInterpolator;
    }
Obtain the default interpolator for the current thread.

@return the pre-existing instance (not null)
jme3-core/src/main/java/com/jme3/anim/interpolator/FrameInterpolator.java