@Override
    public void read(JmeImporter im) throws IOException {
        super.read(im);
        InputCapsule ic = im.getCapsule(this);
    }
Read the size of each shadow map rendered by this filter.

@return a map's height (which is also its width, in pixels)
jme3-core/src/main/java/com/jme3/shadow/AbstractShadowFilter.java