Change camera order ambiguity warning to warn_once!

crates/bevy_render/Cargo.toml

@@ -71,6 +71,7 @@ bevy_window = { path = "../bevy_window", version = "0.19.0-dev" }
 bevy_utils = { path = "../bevy_utils", version = "0.19.0-dev" }
 bevy_tasks = { path = "../bevy_tasks", version = "0.19.0-dev" }
 bevy_image = { path = "../bevy_image", version = "0.19.0-dev" }
+bevy_log = { path = "../bevy_log", version = "0.19.0-dev" }
 bevy_mesh = { path = "../bevy_mesh", version = "0.19.0-dev" }
 bevy_camera = { path = "../bevy_camera", version = "0.19.0-dev" }
 bevy_shader = { path = "../bevy_shader", version = "0.19.0-dev" }

crates/bevy_render/src/camera.rs

@@ -45,6 +45,7 @@ use bevy_platform::collections::{HashMap, HashSet};
 use bevy_reflect::prelude::*;
 use bevy_transform::components::GlobalTransform;
 use bevy_window::{PrimaryWindow, Window, WindowCreated, WindowResized, WindowScaleFactorChanged};
+use bevy_log::warn_once;
 use tracing::warn;
 use wgpu::TextureFormat;
 
@@ -652,7 +653,7 @@ pub fn sort_cameras(
     }
 
     if !ambiguities.is_empty() {
-        warn!(
+        warn_once!(
             "Camera order ambiguities detected for active cameras with the following priorities: {:?}. \
             To fix this, ensure there is exactly one Camera entity spawned with a given order for a given RenderTarget. \
             Ambiguities should be resolved because either (1) multiple active cameras were spawned accidentally, which will \

examples/ui/ui_target_camera.rs

@@ -4,17 +4,11 @@ use bevy::color::palettes::css::BLUE;
 use bevy::color::palettes::css::GREEN;
 use bevy::color::palettes::css::RED;
 use bevy::color::palettes::css::YELLOW;
-use bevy::log::LogPlugin;
-use bevy::log::DEFAULT_FILTER;
 use bevy::prelude::*;
 
 fn main() {
     App::new()
-        .add_plugins(DefaultPlugins.set(LogPlugin {
-            // Disable camera order ambiguity warnings
-            filter: format!("{DEFAULT_FILTER},bevy_render::camera=off"),
-            ..Default::default()
-        }))
+        .add_plugins(DefaultPlugins)
         .add_systems(Startup, setup)
         .run();
 }