@Override
    protected void clearMaterialParameters(Material material) {
        material.clearParam("LightPos");        
    }
Creates a PointLightShadowRenderer

@param assetManager the application asset manager
@param shadowMapSize the size of the rendered shadowmaps (512,1024,2048,
etc...)
jme3-core/src/main/java/com/jme3/shadow/PointLightShadowRenderer.java