public void recalculateAllNormals() {
        affectedAreaBBox = new BoundingBox(new Vector3f(0,0,0), totalSize*2, Float.MAX_VALUE, totalSize*2);
    }
Forces the recalculation of all normals on the terrain.
jme3-terrain/src/main/java/com/jme3/terrain/geomipmap/TerrainQuad.java