protected void cacheTerrainTransforms() {
        this.worldScaleCached = getWorldScale().clone();
        this.worldTranslationCached = getWorldTranslation().clone();
    }
Caches the transforms (except rotation) so the LOD calculator,
which runs on a separate thread, can access them safely.
jme3-terrain/src/main/java/com/jme3/terrain/geomipmap/TerrainPatch.java