@Override
    public void read(JmeImporter im) throws IOException {
        super.read(im);
        InputCapsule ic = im.getCapsule(this);
        whitePoint = (Vector3f) ic.readSavable("whitePoint", DEFAULT_WHITEPOINT.clone());
    }
Get the scene white point.

@return The intensity of the brightest part of the scene.
jme3-effects/src/main/java/com/jme3/post/filters/ToneMapFilter.java