public void animateSubtree(PhysicsLink rootLink, float blendInterval) {
        verifyAddedToSpatial("change modes");
        blendSubtree(rootLink, KinematicSubmode.Animated, blendInterval);
    }
Begin blending the specified link and all its descendants to kinematic
animation.

@param rootLink the root of the subtree to bind (not null)
@param blendInterval the duration of the blend interval (in seconds,
&ge;0)
jme3-jbullet/src/main/java/com/jme3/bullet/animation/DynamicAnimControl.java