protected final void init(AssetManager manager, RenderManager renderManager, ViewPort vp, int w, int h) {
        //  cleanup(renderManager.getRenderer());
        defaultPass = new Pass();
        defaultPass.init(renderManager.getRenderer(), w, h, getDefaultPassTextureFormat(), getDefaultPassDepthFormat());
        initFilter(manager, renderManager, vp, w, h);
    }
initialize this filter
use InitFilter for overriding filter initialization
@param manager the assetManager
@param renderManager the renderManager
@param vp the viewport
@param w the width
@param h the height
jme3-core/src/main/java/com/jme3/post/Filter.java