@Override
    public void write(JmeExporter ex) throws IOException {
        super.write(ex);
        OutputCapsule cap = ex.getCapsule(this);
        cap.write(getDamping(), "damping", 1.0f);
        cap.write(getTau(), "tau", 0.3f);
        cap.write(getImpulseClamp(), "impulseClamp", 0f);
    }
@param nodeA the body for the A end (not null, alias created)
@param nodeB the body for the B end (not null, alias created)
@param pivotA local translation of the joint connection point in node A
@param pivotB local translation of the joint connection point in node B
jme3-jbullet/src/main/java/com/jme3/bullet/joints/Point2PointJoint.java