@Override
    public void initialize(RenderManager rm, ViewPort vp) {
        renderManager = rm;
        viewPort = vp;

        reshape(vp, vp.getCamera().getWidth(), vp.getCamera().getHeight());
    }
Creates a BasicShadowRenderer
@param manager the asset manager
@param size the size of the shadow map (the map is square)
jme3-core/src/main/java/com/jme3/shadow/BasicShadowRenderer.java