void render(Renderer& renderer, BasicCamera& camera, Scene& scene,
Light* light, Canvas& canvas,
std::default_random_engine& r, bool& showRender,
Filter& filter) {
renderer.render(camera, scene, light, canvas, r);
if (!showRender)
showRender = true;
if (filter.getWidth() > 0.85f)
filter.setWidth(filter.getWidth()*0.8f);
std::cout << "filter width: " << filter.getWidth() << std::endl;
}
