@Override
    public void deleteObject(Object rendererObject) {
        ((Renderer)rendererObject).deleteImage(this);
    }
Determine if the image is NPOT.

@return if the image is a non-power-of-2 image, e.g. having dimensions
that are not powers of 2.
jme3-core/src/main/java/com/jme3/texture/Image.java