@Override
    protected void addPhysics(PhysicsSpace space) {
        space.getGravity(localUp).normalizeLocal().negateLocal();
        updateLocalCoordinateSystem();

        space.addCollisionObject(rigidBody);
        space.addTickListener(this);
    }
Add all managed physics objects to the specified space.

@param space which physics space to add to (not null)
jme3-jbullet/src/main/java/com/jme3/bullet/control/BetterCharacterControl.java