optimize light selection

src/main.rs

@@ -192,6 +192,7 @@ impl App {
         let mut data = app_data::AppData::default();
         data.use_geometry_shader = false;
         data.num_lights_per_volume = 5;
+        data.min_light_weight = 0.0001;
         data.max_iterations_per_light = 20;
         data.diffuse_raster_steps = 0;
         data.diffuse_raster_size = 0.01;