protected void prepareTerrain() {
        TerrainQuad terrain = (TerrainQuad) getSpatial();
        // cache the terrain's world transforms so they can be accessed on the separate thread safely
        terrain.cacheTerrainTransforms();
    }
Force the LOD to update instantly, does not wait for the camera to move.
It will reset once it has updated.
jme3-terrain/src/main/java/com/jme3/terrain/geomipmap/TerrainLodControl.java