feat(Blenvy:Bevy): almost complete rework of blueprint spawning workflow (wip)

* added logic to track spawning of sub blueprints
 * added ability to determine when a blueprint instance is truly ready
  (aka all its assets have been loaded, blueprint scene & sub scenes spawned & processed etc)
 * reworked spawning steps for more determinism & reliability
 * no more "seperate" spawning post process
 * lots of related changes
 * still messy but functional

crates/blenvy/src/blueprints/aabb.rs

@@ -1,10 +1,10 @@
 use bevy::{math::Vec3A, prelude::*, render::primitives::Aabb};
 
-use crate::{BlenvyConfig, Spawned};
+use crate::{BlenvyConfig, BlueprintReadyForFinalizing, BlueprintReadyForPostProcess};
 
 /// helper system that computes the compound aabbs of the scenes/blueprints
 pub fn compute_scene_aabbs(
-    root_entities: Query<(Entity, &Name), (With<Spawned>, Without<Aabb>)>,
+    root_entities: Query<(Entity, &Name), (With<BlueprintReadyForPostProcess>, Without<Aabb>)>,
     children: Query<&Children>,
     existing_aabbs: Query<&Aabb>,
 
@@ -21,10 +21,10 @@ pub fn compute_scene_aabbs(
                 .aabb_cache
                 .get(&name.to_string())
                 .expect("we should have the aabb available");
-            commands.entity(root_entity).insert(*aabb);
+            commands.entity(root_entity).insert(*aabb).insert(BlueprintReadyForFinalizing);
         } else {
             let aabb = compute_descendant_aabb(root_entity, &children, &existing_aabbs);
-            commands.entity(root_entity).insert(aabb);
+            commands.entity(root_entity).insert(aabb).insert(BlueprintReadyForFinalizing);
             blenvy_config.aabb_cache.insert(name.to_string(), aabb);
         }
     }

crates/blenvy/src/blueprints/mod.rs

@@ -107,35 +107,36 @@ impl Plugin for BlueprintsPlugin {
                 (
                     blueprints_prepare_spawn,
                     blueprints_check_assets_loading,
-                    blueprints_spawn,
+                    blueprints_assets_ready,
+                    blueprints_scenes_spawned,
+                    blueprints_transfer_components,
+
+                   
+                    (compute_scene_aabbs, apply_deferred)
+                        .chain(),
+                        // .run_if(aabbs_enabled),
+                    apply_deferred,
+
+                    blueprints_finalize_instances,
+
                     
                     /*(
-                        prepare_blueprints,
-                        blueprints_check_assets_loading,
-                        blueprints_spawn,
-                        apply_deferred,
-                    )
-                        .chain(),*/
-                    (compute_scene_aabbs, apply_deferred)
-                        .chain()
-                        .run_if(aabbs_enabled),
-                    apply_deferred,
-                    (
                         materials_inject,
                         check_for_material_loaded,
                         materials_inject2,
                     )
-                        .chain()
+                        .chain()*/
                 )
                     .chain()
                     .in_set(GltfBlueprintsSet::Spawn),
             )
-            .add_systems(
+            /* .add_systems(
                 Update,
                 (spawned_blueprint_post_process, apply_deferred)
                     .chain()
                     .in_set(GltfBlueprintsSet::AfterSpawn),
-            )
+            )*/
+
             /* .add_systems(
                 Update,
                 (
@@ -145,6 +146,7 @@ impl Plugin for BlueprintsPlugin {
             )*/
 
             .add_systems(Update, react_to_asset_changes)
+            // .add_systems(Update, track_sub_blueprints)
             ;
     }
 }

crates/blenvy/src/blueprints/spawn_from_blueprints.rs

@@ -1,6 +1,6 @@
 use std::path::{Path, PathBuf};
 
-use bevy::{asset::LoadedUntypedAsset, gltf::Gltf, prelude::*, render::view::visibility, scene::SceneInstance, transform::commands, utils::hashbrown::HashMap};
+use bevy::{asset::LoadedUntypedAsset, ecs::entity, gltf::Gltf, prelude::*, render::view::visibility, scene::SceneInstance, transform::commands, utils::hashbrown::HashMap};
 use serde_json::Value;
 
 use crate::{BlueprintAssets, BlueprintAssetsLoadState, AssetLoadTracker, BlenvyConfig, BlueprintAnimations, BlueprintAssetsLoaded, BlueprintAssetsNotLoaded};
@@ -65,6 +65,7 @@ pub enum BlueprintEvent {
 
     /// event fired when a blueprint has finished loading its assets & before it attempts spawning
     AssetsLoaded {
+        entity: Entity,
         blueprint_name: String,
         blueprint_path: String,
         // TODO: add assets list ?
@@ -73,18 +74,40 @@ pub enum BlueprintEvent {
     /// - all its assets have been loaded
     /// - the spawning attempt has been sucessfull
     Spawned {
+        entity: Entity,
         blueprint_name: String,
         blueprint_path: String,
     },
 
     /// 
     Ready {
+        entity: Entity,
         blueprint_path: String,
     }
     
 }
 
 
+// TODO: move this somewhere else ?
+#[derive(Component, Reflect, Debug, Default)]
+#[reflect(Component)]
+/// component used to mark any entity as Dynamic: aka add this to make sure your entity is going to be saved
+pub struct DynamicBlueprintInstance;
+
+
+// TODO: move these somewhere else ?
+#[derive(Component, Reflect, Debug, Default)]
+#[reflect(Component)]
+/// component gets added when a blueprint starts spawning, removed when spawning is done
+pub struct BlueprintSpawning;
+
+
+#[derive(Component, Reflect, Debug, Default)]
+#[reflect(Component)]
+/// component gets added when a blueprint spawning is done
+pub struct BlueprintSpawned;
+
+
 use gltf::Gltf as RawGltf;
 
 pub(crate) fn blueprints_prepare_spawn(
@@ -101,8 +124,8 @@ asset_server: Res<AssetServer>,
 ) {
    
     for (entity, blueprint_info, parent, all_assets) in blueprint_instances_to_spawn.iter() {
-        println!("Detected blueprint to spawn: {:?} path:{:?}", blueprint_info.name, blueprint_info.path);
-        println!("all assets {:?}", all_assets);
+        info!("BLUEPRINT: to spawn detected: {:?} path:{:?}", blueprint_info.name, blueprint_info.path);
+        //println!("all assets {:?}", all_assets);
         //////////////
 
         // we add the asset of the blueprint itself
@@ -124,7 +147,7 @@ asset_server: Res<AssetServer>,
 
         // and we also add all its assets
         /* prefetch attempt */
-        let gltf = RawGltf::open(format!("assets/{}", blueprint_info.path)).unwrap();// RawGltf::open("examples/Box.gltf")?;
+        let gltf = RawGltf::open(format!("assets/{}", blueprint_info.path)).unwrap();
         for scene in gltf.scenes() {
             let foo_extras = scene.extras().clone().unwrap();
 
@@ -137,7 +160,7 @@ asset_server: Res<AssetServer>,
                 let assets_raw = &lookup["BlueprintAssets"];
                 //println!("ASSETS RAW {}", assets_raw);
                 let all_assets: BlueprintAssets = ron::from_str(&assets_raw.as_str().unwrap()).unwrap();
-                println!("all_assets {:?}", all_assets);
+                // println!("all_assets {:?}", all_assets);
 
                 for asset in all_assets.assets.iter() {
                     let untyped_handle = asset_server.load_untyped(&asset.path);
@@ -174,6 +197,9 @@ asset_server: Res<AssetServer>,
         } else {
             commands.entity(entity).insert(BlueprintAssetsLoaded);
         }
+
+
+        commands.entity(entity).insert(BlueprintSpawning);
     }
 }
 
@@ -216,8 +242,8 @@ pub(crate) fn blueprints_check_assets_loading(
 
         if all_loaded {
             assets_to_load.all_loaded = true;
-            println!("LOADING: in progress for ALL assets of {:?} (instance of {}), preparing for spawn", entity_name, blueprint_info.path);
-            blueprint_events.send(BlueprintEvent::AssetsLoaded {blueprint_name:"".into(), blueprint_path: blueprint_info.path.clone() });
+            // println!("LOADING: DONE for ALL assets of {:?} (instance of {}), preparing for spawn", entity_name, blueprint_info.path);
+            // blueprint_events.send(BlueprintEvent::AssetsLoaded {blueprint_name:"".into(), blueprint_path: blueprint_info.path.clone() });
 
             commands
                 .entity(entity)
@@ -226,106 +252,35 @@ pub(crate) fn blueprints_check_assets_loading(
                 //.remove::<BlueprintAssetsLoadState>() //REMOVE it in release mode/ when hot reload is off, keep it for dev/hot reload
                 ;
         }else {
-            println!("LOADING: done for ALL assets of {:?} (instance of {}): {} ",entity_name, blueprint_info.path, progress * 100.0);
-        }
-    }
-}
-
-/* 
-pub(crate) fn hot_reload_asset_check(
-    mut blueprint_assets: Query<
-    (Entity, Option<&Name>, &BlueprintInfo, &mut BlueprintAssetsLoadState)>,
-    asset_server: Res<AssetServer>,
-    mut commands: Commands,
-){
-    for (entity, entity_name, blueprint_info, mut assets_to_load) in blueprint_assets.iter_mut() {
-        for tracker in assets_to_load.asset_infos.iter_mut() {
-            let asset_id = tracker.id;
-            asset_server.is_changed()
-            if asset_server.load_state(asset_id) == bevy::asset::LoadState::
-            match asset_server.load_state(asset_id) {
-                bevy::asset::LoadState::Failed(_) => {
-                    failed = true
-                },
-                _ => {}
-            }
-        }
-
-            //AssetEvent::Modified`
-    }
-    
-}*/
-
-use bevy::asset::AssetEvent;
-
-pub(crate) fn react_to_asset_changes(
-    mut gltf_events: EventReader<AssetEvent<Gltf>>,
-    mut untyped_events: EventReader<AssetEvent<LoadedUntypedAsset>>,
-    mut blueprint_assets: Query<(Entity, Option<&Name>, &BlueprintInfo, &mut BlueprintAssetsLoadState, Option<&Children>)>,
-    asset_server: Res<AssetServer>,
-    mut commands: Commands,
-
-) {
-
-    for event in gltf_events.read() {
-        // LoadedUntypedAsset
-        match event {
-            AssetEvent::Modified { id } => {
-                // React to the image being modified
-                // println!("Modified gltf {:?}", asset_server.get_path(*id));
-                for (entity, entity_name, blueprint_info, mut assets_to_load, children) in blueprint_assets.iter_mut() {
-                    for tracker in assets_to_load.asset_infos.iter_mut() {
-                        if asset_server.get_path(*id).is_some() {
-                            if tracker.path == asset_server.get_path(*id).unwrap().to_string() {
-                                println!("HOLY MOLY IT DETECTS !!, now respawn {:?}", entity_name);
-                                if children.is_some() {
-                                    for child in children.unwrap().iter(){
-                                        commands.entity(*child).despawn_recursive();
-                                    }
-                                }
-                                commands.entity(entity)
-                                    .remove::<BlueprintAssetsLoaded>()
-                                    .remove::<SceneInstance>()
-                                    .remove::<BlueprintAssetsLoadState>()
-                                    .insert(SpawnHere);
-
-                                break;
-                            }
-                        }
-                    }
-                }
-
-            }
-            _ => {}
+            // println!("LOADING: in progress for ALL assets of {:?} (instance of {}): {} ",entity_name, blueprint_info.path, progress * 100.0);
         }
     }
 }
 
 
-pub(crate) fn blueprints_spawn(
-    spawn_placeholders: Query<
-        (
-            Entity,
-            &BlueprintInfo,
-            Option<&Transform>,
-            Option<&Parent>,
-            Option<&AddToGameWorld>,
-            Option<&Name>,
-        ),
-        (
-            With<BlueprintAssetsLoaded>,
-            Added<BlueprintAssetsLoaded>,
-            Without<BlueprintAssetsNotLoaded>,
-        ),
-    >,
+pub(crate) fn blueprints_assets_ready(spawn_placeholders: Query<
+    (
+        Entity,
+        &BlueprintInfo,
+        Option<&Transform>,
+        Option<&Parent>,
+        Option<&AddToGameWorld>,
+        Option<&Name>,
+    ),
+    (
+        With<BlueprintAssetsLoaded>,
+        Added<BlueprintAssetsLoaded>,
+        Without<BlueprintAssetsNotLoaded>,
+    ),
+>,
 
     mut commands: Commands,
     mut game_world: Query<Entity, With<GameWorldTag>>,
 
     assets_gltf: Res<Assets<Gltf>>,
     asset_server: Res<AssetServer>,
-    children: Query<&Children>,
-) {
+    children: Query<&Children>,)
+{
     for (
         entity,
         blueprint_info,
@@ -335,9 +290,14 @@ pub(crate) fn blueprints_spawn(
         name,
     ) in spawn_placeholders.iter()
     {
-        info!(
-            "all assets loaded, attempting to spawn blueprint {:?} for entity {:?}, id: {:?}, parent:{:?}",
+        /*info!(
+            "BLUEPRINT: all assets loaded, attempting to spawn blueprint SCENE {:?} for entity {:?}, id: {:}, parent:{:?}",
             blueprint_info.name, name, entity, original_parent
+        );*/
+
+        info!(
+            "BLUEPRINT: all assets loaded, attempting to spawn blueprint SCENE {:?} for entity {:?}, id: {}",
+            blueprint_info.name, name, entity
         );
 
         // info!("attempting to spawn {:?}", model_path);
@@ -385,25 +345,278 @@ pub(crate) fn blueprints_spawn(
 
                 ..Default::default()
             },
-            Spawned,
-            BlueprintInstanceReady, // FIXME: not sure if this is should be added here or in the post process
             OriginalChildren(original_children),
             BlueprintAnimations {
                 // these are animations specific to the inside of the blueprint
                 named_animations: named_animations//gltf.named_animations.clone(),
             },
+            
         ));
 
-        if add_to_world.is_some() {
+        /*        if add_to_world.is_some() {
             let world = game_world
                 .get_single_mut()
                 .expect("there should be a game world present");
             commands.entity(world).add_child(entity);
-        }
+        } */
+
     }
 }
 
 
+#[derive(Component, Reflect, Debug, Default)]
+#[reflect(Component)]
+pub struct SubBlueprintsSpawnTracker{
+    pub sub_blueprint_instances: HashMap<Entity, bool>
+}
+
+#[derive(Component, Reflect, Debug)]
+#[reflect(Component)]
+pub struct SpawnTrackRoot(pub Entity);
+
+#[derive(Component, Reflect, Debug)]
+#[reflect(Component)]
+pub struct BlueprintSceneSpawned;
+
+
+#[derive(Component, Reflect, Debug)]
+#[reflect(Component)]
+pub struct BlueprintChildrenReady;
+
+#[derive(Component, Reflect, Debug)]
+#[reflect(Component)]
+pub struct BlueprintReadyForPostProcess;
 
 
 
+pub(crate) fn blueprints_scenes_spawned(
+    spawned_blueprint_scene_instances: Query<(Entity, Option<&Name>, Option<&Children>, Option<&SpawnTrackRoot>), (With<BlueprintSpawning>, Added<SceneInstance>)>,
+    with_blueprint_infos : Query<(Entity, Option<&Name>), With<BlueprintInfo>>,
+    all_children: Query<&Children>,
+
+    mut sub_blueprint_trackers: Query<(Entity, &mut SubBlueprintsSpawnTracker, &BlueprintInfo)>,
+
+    mut commands: Commands,
+) {
+    for (entity, name, children, track_root) in spawned_blueprint_scene_instances.iter(){
+        info!("Done spawning blueprint scene for entity named {:?} (track root: {:?})", name, track_root);
+        let mut sub_blueprint_instances: Vec<Entity> = vec![];
+        let mut tracker_data: HashMap<Entity, bool> = HashMap::new();
+
+
+        if children.is_some() {
+            for child in all_children.iter_descendants(entity) {
+                if with_blueprint_infos.get(child).is_ok() {
+                    sub_blueprint_instances.push(child);
+                    tracker_data.insert(child, false);
+
+                    if track_root.is_some() {
+                        let prev_root = track_root.unwrap().0;
+                        // if we already had a track root, and it is different from the current entity , change the previous track root's list of children
+                        if prev_root != entity {
+                            let mut tracker = sub_blueprint_trackers.get_mut(prev_root).expect("should have a tracker");
+                            tracker.1.sub_blueprint_instances.remove(&child);
+                        }
+                    }
+                 
+                    commands.entity(child).insert(SpawnTrackRoot(entity));// Injecting to know which entity is the root
+                }
+            }
+        }
+       
+        println!("sub blueprint instances {:?}", sub_blueprint_instances);
+        
+        // TODO: how about when no sub blueprints are present
+        if tracker_data.keys().len() > 0 {
+            commands.entity(entity)
+                .insert(SubBlueprintsSpawnTracker{sub_blueprint_instances: tracker_data.clone()});
+        }else {
+            commands.entity(entity).insert(BlueprintChildrenReady);    
+        }
+    }
+}
+
+// could be done differently, by notifying each parent of a spawning blueprint that this child is done spawning ?
+// perhaps using component hooks or observers (ie , if a ComponentSpawning + Parent)
+
+use crate::{
+    CopyComponents,
+};
+use std::any::TypeId;
+
+
+/// this system is in charge of doing component transfers & co
+/// - it removes one level of useless nesting
+/// - it copies the blueprint's root components to the entity it was spawned on (original entity)
+/// - it copies the children of the blueprint scene into the original entity
+/// - it add `AnimationLink` components so that animations can be controlled from the original entity
+pub(crate) fn blueprints_transfer_components(
+    foo: Query<(
+        Entity, 
+        &Children,
+        &OriginalChildren,
+        Option<&Name>, 
+        Option<&SpawnTrackRoot>), 
+        Added<BlueprintChildrenReady>
+    >,
+    mut sub_blueprint_trackers: Query<(Entity, &mut SubBlueprintsSpawnTracker, &BlueprintInfo)>,
+    all_children: Query<&Children>,
+
+    mut commands: Commands,
+
+    all_names: Query<&Name>
+) {
+
+    for (original, children, original_children, name, track_root) in foo.iter() {
+        println!("YOOO ready !! {:?}", name);
+
+        if children.len() == 0 {
+            warn!("timing issue ! no children found, please restart your bevy app (bug being investigated)");
+            continue;
+        }
+        // the root node is the first & normally only child inside a scene, it is the one that has all relevant components
+        let mut blueprint_root_entity = Entity::PLACEHOLDER; //FIXME: and what about childless ones ?? => should not be possible normally
+                                                   // let diff = HashSet::from_iter(original_children.0).difference(HashSet::from_iter(children));
+                                                   // we find the first child that was not in the entity before (aka added during the scene spawning)
+        for child in children.iter() {
+            if !original_children.0.contains(child) {
+                blueprint_root_entity = *child;
+                break;
+            }
+        }
+
+        // copy components into from blueprint instance's blueprint_root_entity to original entity
+        commands.add(CopyComponents {
+            source: blueprint_root_entity,
+            destination: original,
+            exclude: vec![TypeId::of::<Parent>(), TypeId::of::<Children>()],
+            stringent: false,
+        });
+
+        // we move all of children of the blueprint instance one level to the original entity to avoid having an additional, useless nesting level
+        if let Ok(root_entity_children) = all_children.get(blueprint_root_entity) {
+            for child in root_entity_children.iter() {
+                // info!("copying child {:?} upward from {:?} to {:?}", names.get(*child), blueprint_root_entity, original);
+                commands.entity(original).add_child(*child);
+            }
+        }
+
+
+        commands.entity(original)
+            .insert(BlueprintReadyForPostProcess); // Tag the entity so any systems dealing with post processing can now it is now their "turn" 
+        // commands.entity(original).remove::<Handle<Scene>>(); // FIXME: if we delete the handle to the scene, things get despawned ! not what we want
+        //commands.entity(original).remove::<BlueprintAssetsLoadState>(); // also clear the sub assets tracker to free up handles, perhaps just freeing up the handles and leave the rest would be better ?
+        //commands.entity(original).remove::<BlueprintAssetsLoaded>();
+        commands.entity(blueprint_root_entity).despawn_recursive(); // Remove the root entity that comes from the spawned-in scene
+
+
+        // now check if the current entity is a child blueprint instance of another entity
+        // this should always be done last, as children should be finished before the parent can be processed correctly
+        if let Some(track_root) = track_root {
+            // println!("got some root {:?}", root_name);
+            if let Ok((s_entity, mut tracker, bp_info)) = sub_blueprint_trackers.get_mut(track_root.0) {
+                tracker.sub_blueprint_instances.entry(original).or_insert(true);
+                tracker.sub_blueprint_instances.insert(original, true);
+
+                // TODO: ugh, my limited rust knowledge, this is bad code
+                let mut all_spawned = true;
+                for val in tracker.sub_blueprint_instances.values() {
+                    if !val {
+                        all_spawned = false;
+                        break;
+                    }
+                }
+                if all_spawned {
+                    // println!("ALLLLL SPAAAAWNED for {} named {:?}", track_root.0, root_name);
+                    commands.entity(track_root.0).insert(BlueprintChildrenReady);
+                } 
+            }
+        } 
+    }
+}
+
+#[derive(Component, Reflect, Debug)]
+#[reflect(Component)]
+pub struct BlueprintReadyForFinalizing;
+
+pub(crate) fn blueprints_finalize_instances(
+    blueprint_instances: Query<(Entity, Option<&Name>), (With<BlueprintSpawning>, With<BlueprintReadyForFinalizing>)>,
+    mut commands: Commands,
+) {
+    for (entity, name) in blueprint_instances.iter() {
+        info!("Finalizing blueprint instance {:?}", name);
+        commands.entity(entity)
+            .remove::<SpawnHere>()
+            .remove::<BlueprintSpawning>()
+            .insert(BlueprintSpawned)
+            .insert(Visibility::Visible)
+            ;
+    }
+}
+/*
+BlueprintSpawning
+    - Blueprint Load Assets
+    - Blueprint Assets Ready: spawn Blueprint's scene
+    - Blueprint Scene Ready:
+        - get list of sub Blueprints if any, inject blueprints spawn tracker
+            => annoying issue with the "nested" useless root node created by blender
+            => distinguish between blueprint instances inside blueprint instances vs blueprint instances inside blueprints ??
+    - Blueprint sub_blueprints Ready 
+        if all children are ready
+
+    - Blueprints post process
+        - generate aabb (need full hierarchy in its final form)
+        - materials ?
+*/
+
+
+
+
+
+// HOT RELOAD
+
+
+use bevy::asset::AssetEvent;
+
+pub(crate) fn react_to_asset_changes(
+    mut gltf_events: EventReader<AssetEvent<Gltf>>,
+    mut untyped_events: EventReader<AssetEvent<LoadedUntypedAsset>>,
+    mut blueprint_assets: Query<(Entity, Option<&Name>, &BlueprintInfo, &mut BlueprintAssetsLoadState, Option<&Children>)>,
+    asset_server: Res<AssetServer>,
+    mut commands: Commands,
+
+) {
+
+    for event in gltf_events.read() {
+        // LoadedUntypedAsset
+        match event {
+            AssetEvent::Modified { id } => {
+                // React to the image being modified
+                // println!("Modified gltf {:?}", asset_server.get_path(*id));
+                for (entity, entity_name, blueprint_info, mut assets_to_load, children) in blueprint_assets.iter_mut() {
+                    for tracker in assets_to_load.asset_infos.iter_mut() {
+                        if asset_server.get_path(*id).is_some() {
+                            if tracker.path == asset_server.get_path(*id).unwrap().to_string() {
+                                println!("HOLY MOLY IT DETECTS !!, now respawn {:?}", entity_name);
+                                if children.is_some() {
+                                    for child in children.unwrap().iter(){
+                                        commands.entity(*child).despawn_recursive();
+                                    }
+                                }
+                                commands.entity(entity)
+                                    .remove::<BlueprintAssetsLoaded>()
+                                    .remove::<SceneInstance>()
+                                    .remove::<BlueprintAssetsLoadState>()
+                                    .insert(SpawnHere);
+
+                                break;
+                            }
+                        }
+                    }
+                }
+
+            }
+            _ => {}
+        }
+    }
+}

crates/blenvy/src/blueprints/spawn_post_process.rs

@@ -5,7 +5,7 @@ use bevy::prelude::*;
 use bevy::scene::SceneInstance;
 // use bevy::utils::hashbrown::HashSet;
 
-use crate::{BlueprintAnimationPlayerLink, BlueprintAnimations, BlueprintInfo};
+use crate::{BlueprintAnimationPlayerLink, BlueprintAnimations, BlueprintInfo, BlueprintReadyForPostProcess, BlueprintSpawned, BlueprintSpawning, SpawnTrackRoot, SubBlueprintsSpawnTracker};
 use crate::{SpawnHere, Spawned};
 use crate::{
     BlueprintEvent, CopyComponents, InBlueprint, NoInBlueprint, OriginalChildren
@@ -13,13 +13,14 @@ use crate::{
 
 
 
+
 /// this system is in charge of doing any necessary post processing after a blueprint scene has been spawned
 /// - it removes one level of useless nesting
 /// - it copies the blueprint's root components to the entity it was spawned on (original entity)
 /// - it copies the children of the blueprint scene into the original entity
 /// - it add `AnimationLink` components so that animations can be controlled from the original entity
 /// - it cleans up/ removes a few , by then uneeded components
-pub(crate) fn spawned_blueprint_post_process(
+pub(crate) fn spawned_blueprint_post_process( // rename to '
     unprocessed_entities: Query<
         (
             Entity,
@@ -28,18 +29,24 @@ pub(crate) fn spawned_blueprint_post_process(
             &BlueprintAnimations,
             Option<&NoInBlueprint>,
             Option<&Name>,
-            &BlueprintInfo
+            &BlueprintInfo,
+
+            // sub blueprint instances tracker
+            Option<&SpawnTrackRoot>
         ),
-        (With<SpawnHere>, With<SceneInstance>, With<Spawned>),
+        (With<SpawnHere>, With<SceneInstance>, Added<BlueprintReadyForPostProcess>),
     >,
     added_animation_players: Query<(Entity, &Parent), Added<AnimationPlayer>>,
     all_children: Query<&Children>,
 
+    mut trackers: Query<(Entity, &mut SubBlueprintsSpawnTracker, &BlueprintInfo)>,
+
+
     mut commands: Commands,
     mut blueprint_events: EventWriter<BlueprintEvent>,
 
 ) {
-    for (original, children, original_children, animations, no_inblueprint, name, blueprint_info) in
+    for (original, children, original_children, animations, no_inblueprint, name, blueprint_info, track_root) in
         unprocessed_entities.iter()
     {
         info!("post processing blueprint for entity {:?}", name);
@@ -63,7 +70,7 @@ pub(crate) fn spawned_blueprint_post_process(
         // can be usefull to filter out anything that came from blueprints vs normal children
         if no_inblueprint.is_none() {
             for child in all_children.iter_descendants(root_entity) {
-                commands.entity(child).insert(InBlueprint);
+                commands.entity(child).insert(InBlueprint); // we do this here in order to avoid doing it to normal children
             }
         }
 
@@ -101,11 +108,58 @@ pub(crate) fn spawned_blueprint_post_process(
         // commands.entity(original).remove::<Handle<Scene>>(); // FIXME: if we delete the handle to the scene, things get despawned ! not what we want
         //commands.entity(original).remove::<BlueprintAssetsLoadState>(); // also clear the sub assets tracker to free up handles, perhaps just freeing up the handles and leave the rest would be better ?
         //commands.entity(original).remove::<BlueprintAssetsLoaded>();
-        commands.entity(root_entity).despawn_recursive();
+        commands.entity(root_entity).despawn_recursive(); // Remove the root entity that comes from the spawned-in scene
         commands.entity(original).insert(            Visibility::Visible
         );
-        blueprint_events.send(BlueprintEvent::Spawned {blueprint_name: blueprint_info.name.clone(), blueprint_path: blueprint_info.path.clone() });
+
+        commands.entity(original)
+        .insert(BlueprintSpawned)
+        .remove::<BlueprintSpawning>()
+        
+
+        //
+        .remove::<BlueprintReadyForPostProcess>()
+        ;
+
+
+        if let Some(track_root) = track_root {
+            //println!("got some root");
+            if let Ok((s_entity, mut tracker, bp_info)) = trackers.get_mut(track_root.0) {
+                // println!("found the tracker, setting loaded for {}", entity);
+                tracker.sub_blueprint_instances.entry(original).or_insert(true);
+                tracker.sub_blueprint_instances.insert(original, true);
+
+                // TODO: ugh, my limited rust knowledge, this is bad code
+                let mut all_spawned = true;
+
+                for key in tracker.sub_blueprint_instances.keys() {
+                    let val = tracker.sub_blueprint_instances[key];
+                    println!("Key: {key}, Spawned {}", val);
+                }
+
+                for val in tracker.sub_blueprint_instances.values() {
+                    println!("spawned {}", val);
+                    if !val {
+                        all_spawned = false;
+                        break;
+                    }
+                }
+                if all_spawned { // TODO: move this to an other system, or "notify" the tracked root entity of the fact that all its sub blueprints have been loaded
+                    println!("ALLLLL SPAAAAWNED for {}", track_root.0);
+                    // commands.entity(track_root.0).insert(bundle)
+                    blueprint_events.send(BlueprintEvent::Spawned {entity: track_root.0, blueprint_name: bp_info.name.clone(), blueprint_path: bp_info.path.clone()});
+
+                } 
+            }
+            
+        } 
+        if trackers.get(original).is_err() {
+            // if it has no sub blueprint instances
+            blueprint_events.send(BlueprintEvent::Spawned {entity: original, blueprint_name: blueprint_info.name.clone(), blueprint_path: blueprint_info.path.clone()});
+        }
         
         debug!("DONE WITH POST PROCESS");
+        info!("done instanciating blueprint for entity {:?}", name);
+
     }
 }

crates/blenvy/src/components/blender_settings/lighting.rs

@@ -128,15 +128,15 @@ fn process_tonemapping(
         for (scene_id, tone_mapping) in tonemappings.iter(){
             match tone_mapping {
                 BlenderToneMapping::None => {
-                    println!("TONEMAPPING NONE");
+                    //println!("TONEMAPPING NONE");
                     commands.entity(entity).remove::<Tonemapping>();
                 }
                 BlenderToneMapping::AgX => {
-                    println!("TONEMAPPING Agx");
+                    //println!("TONEMAPPING Agx");
                     commands.entity(entity).insert(Tonemapping::AgX);
                 }
                 BlenderToneMapping::Filmic => {
-                    println!("TONEMAPPING Filmic");
+                    //println!("TONEMAPPING Filmic");
                     commands.entity(entity).insert(Tonemapping::BlenderFilmic);
                 }
             }

testing/bevy_example/src/game/in_game.rs

@@ -1,5 +1,5 @@
 use bevy::prelude::*;
-use blenvy::{BluePrintBundle, BlueprintInfo, GameWorldTag, SpawnHere};
+use blenvy::{BluePrintBundle, BlueprintInfo, DynamicBlueprintInstance, GameWorldTag, SpawnHere};
 use crate::{GameState, InAppRunning};
 
 //use bevy_rapier3d::prelude::Velocity;
@@ -65,6 +65,7 @@ pub fn spawn_test(
                     blueprint: BlueprintInfo{name: "Blueprint1".into() , path:"blueprints/Blueprint1.glb".into()}, // FIXME
                     ..Default::default()
                 },
+                DynamicBlueprintInstance,
                 bevy::prelude::Name::from(format!("test{}", name_index)),
                 // SpawnHere,
                 TransformBundle::from_transform(Transform::from_xyz(x, 2.0, y)),

testing/bevy_example/src/hierarchy_debug.rs

@@ -13,7 +13,7 @@ pub fn setup_hierarchy_debug(mut commands: Commands, asset_server: Res<AssetServ
             "",
             TextStyle {
                 color: LinearRgba { red: 1.0, green:0.0, blue: 0.0, alpha: 1.0}.into(),
-                font_size: 20.,
+                font_size: 15.,
                 ..default()
             },
         )
@@ -156,8 +156,8 @@ impl Plugin for HiearchyDebugPlugin {
     fn build(&self, app: &mut App) {
         app
             .add_systems(Startup, setup_hierarchy_debug)
-            .add_systems(Update, check_for_component)
-            //.add_systems(Update, draw_hierarchy_debug)
+            // .add_systems(Update, check_for_component)
+            .add_systems(Update, draw_hierarchy_debug)
             //.add_systems(Update, check_for_gltf_extras)
             
            ;

tools/blenvy/TODO.md

@@ -216,6 +216,12 @@ Bevy Side:
 - [x] deprecate BlueprintName & BlueprintPath & use BlueprintInfo instead
 - [ ] make blueprint instances invisible until spawning is done to avoid "spawn flash"?
 - [ ] should "blueprint spawned" only be triggered after all its sub blueprints have spawned ? 
+    - [ ] "blueprintInstance ready"/finished
+    BlueprintAssetsLoaded
+    BlueprintSceneSpawned
+    BlueprintChildrenReady
+    BlueprintReadyForPostProcess
+
 - [ ] simplify testing example:
     - [x] remove use of rapier physics (or even the whole common boilerplate ?)
     - [ ] remove/replace bevy editor pls with some native ui to display hierarchies

tools/blenvy/add_ons/bevy_components/components/ui.py

@@ -386,7 +386,7 @@ class BLENVY_PT_component_tools_panel(bpy.types.Panel):
             self.draw_invalid_or_unregistered(layout, status, custom_property, item, item_type)
 
     def gather_invalid_item_data(self, item, invalid_component_names, items_with_invalid_components, items_with_original_components, original_name, item_type):
-        blenvy_custom_properties = ['components_meta', 'bevy_components', 'user_assets', 'generated_assets' ] # some of our own hard coded custom properties that should be ignored
+        blenvy_custom_properties = ['components_meta', 'bevy_components', 'user_assets', 'generated_assets', 'BlueprintAssets', 'export_path' ] # some of our own hard coded custom properties that should be ignored
         upgreadable_entries = []
 
         if "components_meta" in item or hasattr(item, "components_meta"): # FIXME; wrong way of determining

tools/blenvy/tests/test_bevy_integration_simple.py

@@ -0,0 +1,184 @@
+import bpy
+import os 
+import subprocess
+import json
+import pytest
+import shutil
+
+import filecmp
+from PIL import Image
+from pixelmatch.contrib.PIL import pixelmatch
+
+from blenvy.add_ons.auto_export.common.prepare_and_export import prepare_and_export
+
+@pytest.fixture
+def setup_data(request):
+    print("\nSetting up resources...")
+
+    root_path =  "../../testing/bevy_example"
+    assets_root_path = os.path.join(root_path, "assets")
+    blueprints_path =  os.path.join(assets_root_path, "blueprints")
+    levels_path =  os.path.join(assets_root_path, "levels")
+
+    models_path =  os.path.join(assets_root_path, "models")
+    materials_path = os.path.join(assets_root_path, "materials")
+    yield {
+        "root_path": root_path, 
+        "models_path": models_path,
+        "blueprints_path": blueprints_path, 
+        "levels_path": levels_path, 
+        "materials_path":materials_path 
+        }
+
+    def finalizer():
+       
+        #other_materials_path = os.path.join("../../testing", "other_materials")
+
+        print("\nPerforming teardown...")
+        if os.path.exists(blueprints_path):
+            shutil.rmtree(blueprints_path)
+
+        if os.path.exists(levels_path):
+            shutil.rmtree(levels_path)
+
+        if os.path.exists(models_path):
+            shutil.rmtree(models_path)
+
+        if os.path.exists(materials_path):
+            shutil.rmtree(materials_path)
+
+        diagnostics_file_path = os.path.join(root_path, "bevy_diagnostics.json")
+        if os.path.exists(diagnostics_file_path):
+            os.remove(diagnostics_file_path)
+        
+        hierarchy_file_path = os.path.join(root_path, "bevy_hierarchy.json")
+        if os.path.exists(hierarchy_file_path):
+            os.remove(hierarchy_file_path)
+
+        screenshot_observed_path = os.path.join(root_path, "screenshot.png")
+        if os.path.exists(screenshot_observed_path):
+            os.remove(screenshot_observed_path)
+
+    #request.addfinalizer(finalizer)
+
+    return None
+
+
+"""
+- calls exporter on the testing scene
+- launches bevy app & checks for output
+- checks screenshot, hierarchy & diagnostics files generated on the bevy side against reference files
+- if all worked => test is a-ok
+- removes generated files
+"""
+def test_export_complex(setup_data):
+    root_path = setup_data["root_path"]
+
+    # with change detection
+    # first, configure things
+    # we use the global settings for that
+    export_props = {
+    }
+    gltf_settings = {
+        "export_animations": True,
+        "export_optimize_animation_size": False,
+        "export_apply":True
+    }
+
+    # store settings for the auto_export part
+    stored_auto_settings = bpy.data.texts[".gltf_auto_export_settings"] if ".gltf_auto_export_settings" in bpy.data.texts else bpy.data.texts.new(".gltf_auto_export_settings")
+    stored_auto_settings.clear()
+    stored_auto_settings.write(json.dumps(export_props))
+
+    # and store settings for the gltf part
+    stored_gltf_settings = bpy.data.texts[".blenvy_gltf_settings"] if ".blenvy_gltf_settings" in bpy.data.texts else bpy.data.texts.new(".blenvy_gltf_settings")
+    stored_gltf_settings.clear()
+    stored_gltf_settings.write(json.dumps(gltf_settings))
+
+    # move the main cube
+    # bpy.data.objects["Cube"].location = [1, 0, 0]
+    # move the cube in the library
+    # TODO: add back bpy.data.objects["Blueprint1_mesh"].location = [1, 2, 1]
+
+    blenvy = bpy.context.window_manager.blenvy
+    #blenvy.project_root_path = 
+    #blenvy.blueprints_path
+    blenvy.auto_export.auto_export = True
+    blenvy.auto_export.export_scene_settings = True
+    blenvy.auto_export.export_blueprints = True
+    #blenvy.auto_export.export_materials_library = True
+
+    bpy.data.scenes['World'].blenvy_scene_type = 'Level' # set scene as main/level scene
+    bpy.data.scenes['Library'].blenvy_scene_type = 'Library' # set scene as Library scene
+
+    # scene asset
+    user_asset = bpy.data.scenes['World'].user_assets.add()
+    '''user_asset.name = "test_asset"
+    user_asset.path = "audio/fake.mp3"'''
+
+    # blueprint asset
+    #user_asset = bpy.data.collections['Blueprint4_nested'].user_assets.add()
+    '''user_asset.name = "yoho_audio"
+    user_asset.path = "audio/fake.mp3"'''
+
+    # we have to cheat, since we cannot rely on the data injected when saving the library file (since we are not saving it as part of the tests)
+    '''bpy.data.collections["External_blueprint"]["export_path"] = "blueprints/External_blueprint.glb"
+    bpy.data.collections["External_blueprint2"]["export_path"] = "blueprints/External_blueprint2.glb"
+    bpy.data.collections["External_blueprint3"]["export_path"] = "blueprints/External_blueprint3.glb"'''
+
+    # do the actual exporting
+    prepare_and_export()
+
+    # blueprint1 => has an instance, got changed, should export
+    # blueprint2 => has NO instance, but marked as asset, should export
+    # blueprint3 => has NO instance, not marked as asset, used inside blueprint 4: should export
+    # blueprint4 => has an instance, with nested blueprint3, should export
+    # blueprint5 => has NO instance, not marked as asset, should NOT export
+
+    '''assert os.path.exists(os.path.join(setup_data["levels_path"], "World.glb")) == True
+    assert os.path.exists(os.path.join(setup_data["blueprints_path"], "Blueprint1.glb")) == True
+    assert os.path.exists(os.path.join(setup_data["blueprints_path"], "Blueprint2.glb")) == True
+    assert os.path.exists(os.path.join(setup_data["blueprints_path"], "Blueprint3.glb")) == True
+    assert os.path.exists(os.path.join(setup_data["blueprints_path"], "Blueprint4_nested.glb")) == True
+    assert os.path.exists(os.path.join(setup_data["blueprints_path"], "Blueprint5.glb")) == False
+    assert os.path.exists(os.path.join(setup_data["blueprints_path"], "Blueprint6_animated.glb")) == True
+    assert os.path.exists(os.path.join(setup_data["blueprints_path"], "Blueprint7_hierarchy.glb")) == True'''
+
+    # 'assets_list_'+scene.name+"_components" should have been removed after the export
+    assets_list_object_name = "assets_list_"+"World"+"_components"
+    assets_list_object_present = assets_list_object_name in bpy.data.objects
+    assert assets_list_object_present == False
+
+    # now run bevy
+    command = "cargo run --features bevy/dynamic_linking"
+    FNULL = open(os.devnull, 'w')    #use this if you want to suppress output to stdout from the subprocess
+    return_code = subprocess.call(["cargo", "run", "--features", "bevy/dynamic_linking"], cwd=root_path)
+    print("RETURN CODE OF BEVY APP", return_code)
+    assert return_code == 0
+
+    with open(os.path.join(root_path, "bevy_diagnostics.json")) as diagnostics_file:
+        diagnostics = json.load(diagnostics_file)
+        print("diagnostics", diagnostics)
+        assert diagnostics["animations"] == True
+        assert diagnostics["empty_found"] == True
+        assert diagnostics["blueprints_list_found"] == True
+        assert diagnostics["exported_names_correct"] == True
+
+    with open(os.path.join(root_path, "bevy_hierarchy.json")) as hierarchy_file:
+        with open(os.path.join(os.path.dirname(__file__), "expected_bevy_hierarchy.json")) as expexted_hierarchy_file:
+            hierarchy = json.load(hierarchy_file)
+            expected = json.load(expexted_hierarchy_file)
+            assert sorted(hierarchy.items()) == sorted(expected.items())
+
+    # last but not least, do a visual compare
+    screenshot_expected_path = os.path.join(os.path.dirname(__file__), "expected_screenshot.png")
+    screenshot_observed_path = os.path.join(root_path, "screenshot.png")
+    img_a = Image.open(screenshot_expected_path)
+    img_b = Image.open(screenshot_observed_path)
+    img_diff = Image.new("RGBA", img_a.size)
+    mismatch = pixelmatch(img_a, img_b, img_diff, includeAA=True)
+    print("image mismatch", mismatch)
+    assert mismatch < 50
+
+
+