feat(examples): started examples reorg

* moved multiple blendfiles example to be the main "demo"

crates/blenvy/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "blenvy"
-version = "0.0.1"
+version = "0.1.0"
 authors = ["Mark 'kaosat-dev' Moissette"]
 description = "Allows you to define Bevy components direclty inside gltf files and instanciate the components on the Bevy side."
 homepage = "https://github.com/kaosat-dev/Blender_bevy_components_workflow"
@@ -17,6 +17,8 @@ workspace = true
 bevy = { version = "0.14.0-rc.3", default-features = false, features = ["bevy_asset", "bevy_scene", "bevy_gltf"] }
 serde = "1.0.188"
 ron = "0.8.1"
+serde_json = "1.0.108"
+
 
 [dev-dependencies]
 bevy = { version = "0.14.0-rc.3", default-features = false, features = ["dynamic_linking"] }

crates/blenvy/LICENSE.md

@@ -0,0 +1,4 @@
+This crate is available under either:
+
+* The [MIT License](./LICENSE_MIT)
+* The [Apache License, Version 2.0](./LICENSE_APACHE)

crates/blenvy/LICENSE_APACHE.md

@@ -0,0 +1,201 @@
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crates/blenvy/LICENSE_MIT.md

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 Mark "kaosat-dev" Moissette
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
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+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

crates/blenvy/README.md

@@ -0,0 +1,333 @@
+[![Crates.io](https://img.shields.io/crates/v/blenvy)](https://crates.io/crates/blenvy)
+[![Docs](https://img.shields.io/docsrs/blenvy)](https://docs.rs/blenvy/latest/blenvy/)
+[![License](https://img.shields.io/crates/l/blenvy)](https://github.com/kaosat-dev/Blender_bevy_components_workflow/blob/main/crates/blenvy/License.md)
+[![Bevy tracking](https://img.shields.io/badge/Bevy%20tracking-released%20version-lightblue)](https://github.com/bevyengine/bevy/blob/main/docs/plugins_guidelines.md#main-branch-tracking)
+
+# blenvy
+
+this crate adds the ability to define Blueprints/Prefabs for [Bevy](https://bevyengine.org/) inside gltf files and spawn them in Bevy.
+
+* Allows you to create lightweight levels, where all assets are different gltf files and loaded after the main level is loaded
+* Allows you to spawn different entities from gtlf files at runtime in a clean manner, including simplified animation support !
+
+A blueprint is a set of **overrideable** components + a hierarchy: ie 
+
+    * just a Gltf file with Gltf_extras specifying components 
+    * a component called BlueprintName
+
+Particularly useful when using [Blender](https://www.blender.org/) as an editor for the [Bevy](https://bevyengine.org/) game engine, combined with the Blender add-on that do a lot of the work for you 
+- [blenvy](https://github.com/kaosat-dev/Blender_bevy_components_workflow/tree/main/tools/blenvy)
+
+
+## Usage
+
+Here's a minimal usage example:
+
+```toml
+# Cargo.toml
+[dependencies]
+bevy="0.14"
+blenvy = { version = "0.1.0"} 
+
+```
+
+```rust no_run
+use bevy::prelude::*;
+use blenvy::*;
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .add_plugins(BlenvyPlugin)
+
+        .run();
+}
+
+// not shown here: any other setup that is not specific to blueprints
+
+fn spawn_blueprint(
+    mut commands: Commands,
+    keycode: Res<Input<KeyCode>>,
+){
+    if keycode.just_pressed(KeyCode::S) {
+        let new_entity = commands.spawn((
+            BlueprintName("Health_Pickup".to_string()), // mandatory !!
+            SpawnHere, // mandatory !!
+            TransformBundle::from_transform(Transform::from_xyz(x, 2.0, y)), // VERY important !!
+            // any other component you want to insert
+        ));
+    }
+}
+```
+
+##  Installation
+
+Add the following to your `[dependencies]` section in `Cargo.toml`:
+
+```toml
+blenvy = "0.1.0"
+```
+
+Or use `cargo add`:
+
+```toml
+cargo add blenvy
+```
+
+## Setup
+
+```rust no_run
+use bevy::prelude::*;
+use blenvy::*;
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .add_plugin(BlenvyPlugin)
+
+        .run();
+}
+
+```
+
+you may want to configure your "library"/"blueprints" settings:
+
+```rust no_run
+use bevy::prelude::*;
+use blenvy::*;
+
+fn main() {
+    App::new()
+        .add_plugins((
+             BlenvyPlugin{
+                aabbs: true, // defaults to false, enable this to automatically calculate aabb for the scene/blueprint
+                ..Default::default()
+            }
+        ))
+        .run();
+}
+
+```
+
+## Spawning entities from blueprints
+
+You can spawn entities from blueprints like this:
+```rust no_run
+commands.spawn((
+    BlueprintName("Health_Pickup".to_string()), // mandatory !!
+    SpawnHere, // mandatory !!
+    
+    TransformBundle::from_transform(Transform::from_xyz(x, 2.0, y)), // optional
+    // any other component you want to insert
+))
+
+``` 
+
+Once spawning of the actual entity is done, the spawned Blueprint will be *gone/merged* with the contents of Blueprint !
+
+> Important :
+you can **add** or **override** components present inside your Blueprint when spawning the BluePrint itself: ie
+
+### Adding components not specified inside the blueprint
+
+you can just add any additional components you need when spawning :
+
+```rust no_run
+commands.spawn((
+    BlueprintName("Health_Pickup".to_string()),
+    SpawnHere,
+    TransformBundle::from_transform(Transform::from_xyz(x, 2.0, y)),
+    // from Rapier/bevy_xpbd: this means the entity will also have a velocity component when inserted into the world
+    Velocity {
+        linvel: Vec3::new(vel_x, vel_y, vel_z),
+        angvel: Vec3::new(0.0, 0.0, 0.0),
+      },
+))
+
+``` 
+### Overriding components specified inside the blueprint
+
+any component you specify when spawning the Blueprint that is also specified **within** the Blueprint will **override** that component in the final spawned entity
+
+for example 
+```rust no_run
+commands.spawn((
+    BlueprintName("Health_Pickup".to_string()),
+    SpawnHere,
+    TransformBundle::from_transform(Transform::from_xyz(x, 2.0, y)),
+    HealthPowerUp(20)// if this is component is also present inside the "Health_Pickup" blueprint, that one will be replaced with this component during spawning
+))
+
+``` 
+
+### BluePrintBundle
+
+There is also a ```BluePrintBundle``` for convenience , which just has 
+ * a ```BlueprintName``` component
+ * a ```SpawnHere``` component
+
+## Additional information
+
+- When a blueprint is spawned, all its children entities (and nested children etc) also have an ```InBlueprint``` component that gets insert
+- In cases where that is undesirable, you can add a ```NoInBlueprint``` component on the entity you spawn the blueprint with, and the components above will not be add
+- if you want to overwrite the **path** where this crate looks for blueprints (gltf files) , you can add a ```Library``` component , and that will be used instead of the default path
+ie :
+
+```rust no_run
+commands
+    .spawn((
+        Name::from("test"),
+        BluePrintBundle {
+            blueprint: BlueprintName("TestBlueprint".to_string()),
+            ..Default::default()
+        },
+        Library("models".into()) // now the path to the blueprint above will be /assets/models/TestBlueprint.glb
+    ))
+```
+- this crate also provides a special optional ```GameWorldTag``` component: this is useful when you want to keep all your spawned entities inside a root entity
+
+You can use it in your queries to add your entities as children of this "world"
+This way all your levels, your dynamic entities etc, are kept seperated from UI nodes & other entities that are not relevant to the game world
+
+> Note: you should only have a SINGLE entity tagged with that component !
+
+```rust no_run
+    commands.spawn((
+        SceneBundle {
+            scene: models
+                .get(game_assets.world.id())
+                .expect("main level should have been loaded")
+                .scenes[0]
+                .clone(),
+            ..default()
+        },
+        bevy::prelude::Name::from("world"),
+        GameWorldTag, // here it is
+    ));
+```
+
+
+## SystemSet
+
+the ordering of systems is very important ! 
+
+For example to replace your proxy components (stand-in components when you cannot/ do not want to use real components in the gltf file) with actual ones, which should happen **AFTER** the Blueprint based spawning, 
+
+so ```blenvy``` provides a **SystemSet** for that purpose: ```GltfBlueprintsSet```
+
+Typically , the order of systems should be
+
+***bevy_gltf_components (GltfComponentsSet::Injection)*** => ***blenvy (GltfBlueprintsSet::Spawn, GltfBlueprintsSet::AfterSpawn)*** => ***replace_proxies***
+
+see https://github.com/kaosat-dev/Blender_bevy_components_workflow/tree/main/examples/blenvy/basic for how to set it up correctly
+
+
+
+## Animation
+
+```blenvy``` provides some lightweight helpers to deal with animations stored in gltf files
+
+ * an ```Animations``` component that gets inserted into spawned (root) entities that contains a hashmap of all animations contained inside that entity/gltf file .
+ (this is a copy of the ```named_animations``` inside Bevy's gltf structures )
+ * an ```AnimationPlayerLink``` component that gets inserted into spawned (root) entities, to make it easier to trigger/ control animations than it usually is inside Bevy + Gltf files
+
+The workflow for animations is as follows:
+* create a gltf file with animations (using Blender & co) as you would normally do
+* inside Bevy, use the ```blenvy``` boilerplate (see sections above), no specific setup beyond that is required
+* to control the animation of an entity, you need to query for entities that have both ```AnimationPlayerLink``` and ```Animations``` components (added by ```blenvy```) AND entities with the ```AnimationPlayer``` component
+ 
+For example:
+
+```rust no_run
+// example of changing animation of entities based on proximity to the player, for "fox" entities (Tag component)
+pub fn animation_change_on_proximity_foxes(
+    players: Query<&GlobalTransform, With<Player>>,
+    animated_foxes: Query<(&GlobalTransform, &AnimationPlayerLink, &Animations ), With<Fox>>,
+
+    mut animation_players: Query<&mut AnimationPlayer>,
+
+){
+    for player_transforms in players.iter() {
+        for (fox_tranforms, link, animations) in animated_foxes.iter() {
+            let distance = player_transforms
+                .translation()
+                .distance(fox_tranforms.translation());
+            let mut anim_name = "Walk"; 
+            if distance < 8.5 {
+                anim_name = "Run"; 
+            }
+            else if distance >= 8.5 && distance < 10.0{
+                anim_name = "Walk";
+            }
+            else if distance >= 10.0 && distance < 15.0{
+                anim_name = "Survey";
+            }
+            // now play the animation based on the chosen animation name
+            let mut animation_player = animation_players.get_mut(link.0).unwrap();
+            animation_player.play_with_transition(
+                animations.named_animations.get(anim_name).expect("animation name should be in the list").clone(), 
+                Duration::from_secs(3)
+            ).repeat();
+        }
+    }
+}
+```
+
+see https://github.com/kaosat-dev/Blender_bevy_components_workflow/tree/main/examples/blenvy/animation for how to set it up correctly
+
+particularly from https://github.com/kaosat-dev/Blender_bevy_components_workflow/tree/main/examples/blenvy/animation/game/in_game.rs
+
+
+## Materials
+
+You have the option of using "material libraries" to share common textures/materials between blueprints, in order to avoid asset & memory bloat:
+
+Ie for example without this option, 56 different blueprints using the same material with a large texture would lead to the material/texture being embeded
+56 times !!
+
+
+you can configure this with the settings:
+```rust
+material_library: true  // defaults to false, enable this to enable automatic injection of materials from material library files
+```
+
+> Important! you must take care of preloading your material librairy gltf files in advance, using for example ```bevy_asset_loader```since 
+```blenvy``` currently does NOT take care of loading those at runtime
+
+
+see https://github.com/kaosat-dev/Blender_bevy_components_workflow/tree/main/examples/blenvy/materials for how to set it up correctly
+
+Generating optimised blueprints and material libraries can be automated using the latests version of the [Blender plugin](https://github.com/kaosat-dev/Blender_bevy_components_workflow/tree/main/tools/gltf_auto_export)
+
+
+## Examples
+
+https://github.com/kaosat-dev/Blender_bevy_components_workflow/tree/main/examples/blenvy/basic
+
+https://github.com/kaosat-dev/Blender_bevy_components_workflow/tree/main/examples/blenvy/basic_xpbd_physics
+
+https://github.com/kaosat-dev/Blender_bevy_components_workflow/tree/main/examples/blenvy/animation
+
+https://github.com/kaosat-dev/Blender_bevy_components_workflow/tree/main/examples/blenvy/materials
+
+https://github.com/kaosat-dev/Blender_bevy_components_workflow/tree/main/examples/blenvy/multiple_levels_multiple_blendfiles
+
+
+## Compatible Bevy versions
+
+The main branch is compatible with the latest Bevy release, while the branch `bevy_main` tries to track the `main` branch of Bevy (PRs updating the tracked commit are welcome).
+
+Compatibility of `blenvy` versions:
+| `blenvy` | `bevy` |
+| :--                 | :--    |
+| `0.1 - 0.2`         | `0.14` |
+| branch `main`       | `0.14` |
+| branch `bevy_main`  | `main` |
+
+
+## License
+
+This crate, all its code, contents & assets is Dual-licensed under either of
+
+- Apache License, Version 2.0, ([LICENSE-APACHE](./LICENSE_APACHE.md) or https://www.apache.org/licenses/LICENSE-2.0)
+- MIT license ([LICENSE-MIT](./LICENSE_MIT.md) or https://opensource.org/licenses/MIT)

crates/blenvy/src/blueprints/aabb.rs

@@ -0,0 +1,61 @@
+use bevy::{math::Vec3A, prelude::*, render::primitives::Aabb};
+
+use crate::{BlenvyConfig, Spawned};
+
+/// 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>)>,
+    children: Query<&Children>,
+    existing_aabbs: Query<&Aabb>,
+
+    mut blenvy_config: ResMut<BlenvyConfig>,
+    mut commands: Commands,
+) {
+    // compute compound aabb
+    for (root_entity, name) in root_entities.iter() {
+        // info!("generating aabb for {:?}", name);
+
+        // only recompute aabb if it has not already been done before
+        if blenvy_config.aabb_cache.contains_key(&name.to_string()) {
+            let aabb = blenvy_config
+                .aabb_cache
+                .get(&name.to_string())
+                .expect("we should have the aabb available");
+            commands.entity(root_entity).insert(*aabb);
+        } else {
+            let aabb = compute_descendant_aabb(root_entity, &children, &existing_aabbs);
+            commands.entity(root_entity).insert(aabb);
+            blenvy_config.aabb_cache.insert(name.to_string(), aabb);
+        }
+    }
+}
+
+pub fn compute_descendant_aabb(
+    root_entity: Entity,
+    children: &Query<&Children>,
+    existing_aabbs: &Query<&Aabb>,
+) -> Aabb {
+    if let Ok(children_list) = children.get(root_entity) {
+        let mut chilren_aabbs: Vec<Aabb> = vec![];
+        for child in children_list.iter() {
+            if let Ok(aabb) = existing_aabbs.get(*child) {
+                chilren_aabbs.push(*aabb);
+            } else {
+                let aabb = compute_descendant_aabb(*child, children, existing_aabbs);
+                chilren_aabbs.push(aabb);
+            }
+        }
+
+        let mut min = Vec3A::splat(f32::MAX);
+        let mut max = Vec3A::splat(f32::MIN);
+        for aabb in chilren_aabbs.iter() {
+            min = min.min(aabb.min());
+            max = max.max(aabb.max());
+        }
+        let aabb = Aabb::from_min_max(Vec3::from(min), Vec3::from(max));
+
+        return aabb;
+    }
+
+    Aabb::default()
+}

crates/blenvy/src/blueprints/animation.rs

@@ -0,0 +1,221 @@
+use bevy::prelude::*;
+use bevy::utils::HashMap;
+
+#[derive(Component, Reflect, Default, Debug)]
+#[reflect(Component)]
+/// storage for animations for a given entity's BLUEPRINT (ie for example a characters animations), essentially a clone of gltf's `named_animations`
+pub struct BlueprintAnimations {
+    pub named_animations: HashMap<String, Handle<AnimationClip>>,
+}
+
+#[derive(Component, Debug)]
+/// Stop gap helper component : this is inserted into a "root" entity (an entity representing a whole gltf file)
+/// so that the root entity knows which of its children contains an actualy `AnimationPlayer` component
+/// this is for convenience, because currently , Bevy's gltf parsing inserts `AnimationPlayers` "one level down"
+/// ie armature/root for animated models, which means more complex queries to trigger animations that we want to avoid
+pub struct BlueprintAnimationPlayerLink(pub Entity);
+
+#[derive(Component, Reflect, Default, Debug)]
+#[reflect(Component)]
+/// storage for scene level animations for a given entity (hierarchy), essentially a clone of gltf's `named_animations`
+pub struct SceneAnimations {
+    pub named_animations: HashMap<String, Handle<AnimationClip>>,
+}
+
+#[derive(Component, Debug)]
+/// Stop gap helper component : this is inserted into a "root" entity (an entity representing a whole gltf file)
+/// so that the root entity knows which of its children contains an actualy `AnimationPlayer` component
+/// this is for convenience, because currently , Bevy's gltf parsing inserts `AnimationPlayers` "one level down"
+/// ie armature/root for animated models, which means more complex queries to trigger animations that we want to avoid
+pub struct SceneAnimationPlayerLink(pub Entity);
+
+/// Stores Animation information: name, frame informations etc
+#[derive(Reflect, Default, Debug)]
+pub struct AnimationInfo {
+    pub name: String,
+    pub frame_start: f32,
+    pub frame_end: f32,
+    pub frames_length: f32,
+    pub frame_start_override: f32,
+    pub frame_end_override: f32,
+}
+
+/// Stores information about animations, to make things a bit easier api wise:
+/// these components are automatically inserted by `gltf_auto_export` on entities that have animations
+#[derive(Component, Reflect, Default, Debug)]
+#[reflect(Component)]
+pub struct AnimationInfos {
+    pub animations: Vec<AnimationInfo>,
+}
+
+#[derive(Reflect, Default, Debug)]
+pub struct AnimationMarker {
+    // pub frame: u32,
+    pub name: String,
+    pub handled_for_cycle: bool,
+}
+
+/// Stores information about animation markers: practical for adding things like triggering events at specific keyframes etc
+/// it is essentiall a hashmap of `AnimationName` => `HashMap`<`FrameNumber`, Vec of marker names>
+#[derive(Component, Reflect, Default, Debug)]
+#[reflect(Component)]
+pub struct AnimationMarkers(pub HashMap<String, HashMap<u32, Vec<String>>>);
+
+/// Event that gets triggered once a specific marker inside an animation has been reached (frame based)
+/// Provides some usefull information about which entity , wich animation, wich frame & which marker got triggered
+#[derive(Event, Debug)]
+pub struct AnimationMarkerReached {
+    pub entity: Entity,
+    pub animation_name: String,
+    pub frame: u32,
+    pub marker_name: String,
+}
+
+/////////////////////
+
+/* 
+/// triggers events when a given animation marker is reached for INSTANCE animations
+pub fn trigger_instance_animation_markers_events(
+    animation_infos: Query<(
+        Entity,
+        &AnimationMarkers,
+        &SceneAnimationPlayerLink,
+        &SceneAnimations,
+        &AnimationInfos,
+    )>,
+    animation_players: Query<(&AnimationPlayer)>,
+    animation_clips: Res<Assets<AnimationClip>>,
+    animation_graphs: Res<Assets<AnimationGraph>>,
+    mut animation_marker_events: EventWriter<AnimationMarkerReached>,
+) {
+    for (entity, markers, link, animations, animation_infos) in animation_infos.iter() {
+        let animation_player = animation_players.get(link.0).unwrap();
+        let animation_clip = animation_clips.get(animation_player.animation_clip());
+        // animation_player.play(animation)
+
+        if animation_clip.is_some() {
+            // println!("Entity {:?} markers {:?}", entity, markers);
+            // println!("Player {:?} {}", animation_player.elapsed(), animation_player.completions());
+            // FIMXE: yikes ! very inneficient ! perhaps add boilerplate to the "start playing animation" code so we know what is playing
+            let animation_name = animations.named_animations.iter().find_map(|(key, value)| {
+                if value == animation_player.animation_clip() {
+                    Some(key)
+                } else {
+                    None
+                }
+            });
+            if animation_name.is_some() {
+                let animation_name = animation_name.unwrap();
+
+                let animation_length_seconds = animation_clip.unwrap().duration();
+                let animation_length_frames = animation_infos
+                    .animations
+                    .iter()
+                    .find(|anim| &anim.name == animation_name)
+                    .unwrap()
+                    .frames_length;
+                // TODO: we also need to take playback speed into account
+                let time_in_animation = animation_player.elapsed()
+                    - (animation_player.completions() as f32) * animation_length_seconds;
+                let frame_seconds =
+                    (animation_length_frames / animation_length_seconds) * time_in_animation;
+                let frame = frame_seconds as u32;
+
+                let matching_animation_marker = &markers.0[animation_name];
+                if matching_animation_marker.contains_key(&frame) {
+                    let matching_markers_per_frame = matching_animation_marker.get(&frame).unwrap();
+
+                    // let timediff = animation_length_seconds - time_in_animation;
+                    // println!("timediff {}", timediff);
+                    // println!("FOUND A MARKER {:?} at frame {}", matching_markers_per_frame, frame);
+                    // emit an event AnimationMarkerReached(entity, animation_name, frame, marker_name)
+                    // FIXME: problem, this can fire multiple times in a row, depending on animation length , speed , etc
+                    for marker in matching_markers_per_frame {
+                        animation_marker_events.send(AnimationMarkerReached {
+                            entity,
+                            animation_name: animation_name.clone(),
+                            frame,
+                            marker_name: marker.clone(),
+                        });
+                    }
+                }
+            }
+        }
+    }
+}
+
+/// triggers events when a given animation marker is reached for BLUEPRINT animations
+pub fn trigger_blueprint_animation_markers_events(
+    animation_infos: Query<(Entity, &BlueprintAnimationPlayerLink, &BlueprintAnimations)>,
+    // FIXME: annoying hiearchy issue yet again: the Markers & AnimationInfos are stored INSIDE the blueprint, so we need to access them differently
+    all_animation_infos: Query<(Entity, &AnimationMarkers, &AnimationInfos, &Parent)>,
+    animation_players: Query<&AnimationPlayer>,
+    animation_clips: Res<Assets<AnimationClip>>,
+    mut animation_marker_events: EventWriter<AnimationMarkerReached>,
+) {
+    for (entity, link, animations) in animation_infos.iter() {
+        let animation_player = animation_players.get(link.0).unwrap();
+        let animation_clip = animation_clips.get(animation_player.animation_clip());
+
+        // FIXME: horrible code
+        for (_, markers, animation_infos, parent) in all_animation_infos.iter() {
+            if parent.get() == entity {
+                if animation_clip.is_some() {
+                    // println!("Entity {:?} markers {:?}", entity, markers);
+                    // println!("Player {:?} {}", animation_player.elapsed(), animation_player.completions());
+                    // FIMXE: yikes ! very inneficient ! perhaps add boilerplate to the "start playing animation" code so we know what is playing
+                    let animation_name =
+                        animations.named_animations.iter().find_map(|(key, value)| {
+                            if value == animation_player.animation_clip() {
+                                Some(key)
+                            } else {
+                                None
+                            }
+                        });
+                    if animation_name.is_some() {
+                        let animation_name = animation_name.unwrap();
+                        let animation_length_seconds = animation_clip.unwrap().duration();
+                        let animation_length_frames = animation_infos
+                            .animations
+                            .iter()
+                            .find(|anim| &anim.name == animation_name)
+                            .unwrap()
+                            .frames_length;
+                        // TODO: we also need to take playback speed into account
+                        let time_in_animation = animation_player.elapsed()
+                            - (animation_player.completions() as f32) * animation_length_seconds;
+                        let frame_seconds = (animation_length_frames / animation_length_seconds)
+                            * time_in_animation;
+                        // println!("frame seconds {}", frame_seconds);
+                        let frame = frame_seconds.ceil() as u32; // FIXME , bad hack
+
+                        let matching_animation_marker = &markers.0[animation_name];
+
+                        if matching_animation_marker.contains_key(&frame) {
+                            let matching_markers_per_frame =
+                                matching_animation_marker.get(&frame).unwrap();
+                            // println!("FOUND A MARKER {:?} at frame {}", matching_markers_per_frame, frame);
+                            // emit an event AnimationMarkerReached(entity, animation_name, frame, marker_name)
+                            // FIXME: complete hack-ish solution , otherwise this can fire multiple times in a row, depending on animation length , speed , etc
+                            let diff = frame as f32 - frame_seconds;
+                            println!("diff {}", diff);
+                            if diff < 0.1 {
+                                for marker in matching_markers_per_frame {
+                                    animation_marker_events.send(AnimationMarkerReached {
+                                        entity,
+                                        animation_name: animation_name.clone(),
+                                        frame,
+                                        marker_name: marker.clone(),
+                                    });
+                                }
+                            }
+                        }
+                    }
+                }
+
+                break;
+            }
+        }
+    }
+}
+*/

crates/blenvy/src/blueprints/assets.rs

@@ -0,0 +1,63 @@
+use std::path::{Path, PathBuf};
+
+use bevy::{asset::LoadedUntypedAsset, gltf::Gltf, prelude::*, utils::HashMap};
+
+use crate::{BlenvyConfig, BlueprintAnimations};
+
+/// helper component, is used to store the list of sub blueprints to enable automatic loading of dependend blueprints
+#[derive(Component, Reflect, Default, Debug)]
+#[reflect(Component)]
+pub struct MyAsset{
+    pub name: String,
+    pub path: String
+}
+
+/// helper component, is used to store the list of sub blueprints to enable automatic loading of dependend blueprints
+#[derive(Component, Reflect, Default, Debug)]
+#[reflect(Component)]
+pub struct LocalAssets(pub Vec<MyAsset>);
+
+/// helper component, is used to store the list of sub blueprints to enable automatic loading of dependend blueprints
+#[derive(Component, Reflect, Default, Debug)]
+#[reflect(Component)]
+pub struct AllAssets(pub Vec<MyAsset>);
+
+
+
+////////////////////////
+/// 
+/// flag component, usually added when a blueprint is loaded
+#[derive(Component)]
+pub(crate) struct BlueprintAssetsLoaded;
+/// flag component
+#[derive(Component)]
+pub(crate) struct BlueprintAssetsNotLoaded;
+
+/// helper component, for tracking loaded assets's loading state, id , handle etc
+#[derive(Debug)]
+pub(crate) struct AssetLoadTracker {
+    #[allow(dead_code)]
+    pub name: String,
+    pub id: AssetId<LoadedUntypedAsset>,
+    pub loaded: bool,
+    #[allow(dead_code)]
+    pub handle: Handle<LoadedUntypedAsset>,
+}
+
+
+/// helper component, for tracking loaded assets
+#[derive(Component, Debug)]
+pub(crate) struct AssetsToLoad {
+    pub all_loaded: bool,
+    pub asset_infos: Vec<AssetLoadTracker>,
+    pub progress: f32,
+}
+impl Default for AssetsToLoad {
+    fn default() -> Self {
+        Self {
+            all_loaded: Default::default(),
+            asset_infos: Default::default(),
+            progress: Default::default(),
+        }
+    }
+}

crates/blenvy/src/blueprints/copy_components.rs

@@ -0,0 +1,107 @@
+use bevy::ecs::world::Command;
+use bevy::prelude::*;
+use std::any::TypeId;
+
+// originally based  https://github.com/bevyengine/bevy/issues/1515,
+// more specifically https://gist.github.com/nwtnni/85d6b87ae75337a522166c500c9a8418
+// to work with Bevy 0.11
+// to copy components between entities but NOT overwriting any existing components
+// plus some bells & whistles
+pub struct CopyComponents {
+    pub source: Entity,
+    pub destination: Entity,
+    pub exclude: Vec<TypeId>,
+    pub stringent: bool,
+}
+
+impl CopyComponents {
+    // Copy all components from an entity to another.
+    // Using an entity with no components as the destination creates a copy of the source entity.
+    // Panics if:
+    // - the components are not registered in the type registry,
+    // - the world does not have a type registry
+    // - the source or destination entity do not exist
+    fn transfer_components(self, world: &mut World) {
+        let components = {
+            let registry = world
+                .get_resource::<AppTypeRegistry>()
+                .expect("the world should have a type registry")
+                .read();
+
+            world
+                .get_entity(self.source)
+                .expect("source entity should exist")
+                .archetype()
+                .components()
+                .filter_map(|component_id| {
+                    let component_info = world
+                        .components()
+                        .get_info(component_id)
+                        .expect("component info should be available");
+
+                    let type_id = component_info.type_id().unwrap();
+                    if self.exclude.contains(&type_id) {
+                        debug!("excluding component: {:?}", component_info.name());
+                        None
+                    } else {
+                        debug!(
+                            "cloning: component: {:?} {:?}",
+                            component_info.name(),
+                            type_id
+                        );
+
+                        if let Some(type_registration) = registry.get(type_id) {
+                            Some(type_registration)
+                        } else if self.stringent {
+                            return Some(registry.get(type_id).unwrap_or_else(|| {
+                                panic!(
+                                    "cannot clone entity: component: {:?} is not registered",
+                                    component_info.name()
+                                )
+                            }));
+                        } else {
+                            warn!(
+                                "cannot clone component: component: {:?} is not registered",
+                                component_info.name()
+                            );
+                            None
+                        }
+                    }
+                })
+                .map(|type_id| {
+                    return (
+                        type_id.data::<ReflectComponent>().unwrap().clone(),
+                        type_id.type_info().type_id(), // we need the original type_id down the line
+                    );
+                })
+                .collect::<Vec<_>>()
+        };
+
+        for (component, type_id) in components {
+            let type_registry: &AppTypeRegistry = world.resource();
+            let type_registry = type_registry.clone();
+            let type_registry = type_registry.read();
+            let source = component
+                .reflect(world.get_entity(self.source).unwrap())
+                .unwrap()
+                .clone_value();
+
+            let mut destination = world
+                .get_entity_mut(self.destination)
+                .expect("destination entity should exist");
+
+            // println!("contains typeid {:?} {}", type_id, destination.contains_type_id(type_id));
+            // we only want to copy components that are NOT already in the destination (ie no overwriting existing components)
+            if !destination.contains_type_id(type_id) {
+                component.insert(&mut destination, &*source, &type_registry);
+            }
+        }
+    }
+}
+
+// This allows the command to be used in systems
+impl Command for CopyComponents {
+    fn apply(self, world: &mut World) {
+        self.transfer_components(world);
+    }
+}

crates/blenvy/src/blueprints/materials.rs

@@ -0,0 +1,189 @@
+use std::path::Path;
+
+use bevy::{
+    asset::{AssetServer, Assets, Handle},
+    ecs::{
+        component::Component,
+        entity::Entity,
+        query::{Added, With},
+        reflect::ReflectComponent,
+        system::{Commands, Query, Res, ResMut},
+    },
+    gltf::Gltf,
+    hierarchy::{Children, Parent},
+    log::debug,
+    pbr::StandardMaterial,
+    reflect::Reflect,
+    render::mesh::Mesh,
+};
+
+use crate::{AssetLoadTracker, AssetsToLoad, BlenvyConfig, BlueprintInstanceReady};
+
+#[derive(Component, Reflect, Default, Debug)]
+#[reflect(Component)]
+/// struct containing the name & path of the material to apply
+pub struct MaterialInfo {
+    pub name: String,
+    pub path: String,
+}
+
+/// flag component
+#[derive(Component)]
+pub(crate) struct BlueprintMaterialAssetsLoaded;
+/// flag component
+#[derive(Component)]
+pub(crate) struct BlueprintMaterialAssetsNotLoaded;
+
+/// system that injects / replaces materials from material library
+pub(crate) fn materials_inject(
+    blenvy_config: ResMut<BlenvyConfig>,
+    material_infos: Query<(Entity, &MaterialInfo), Added<MaterialInfo>>,
+    asset_server: Res<AssetServer>,
+    mut commands: Commands,
+) {
+
+
+    for (entity, material_info) in material_infos.iter() {
+        println!("Entity with material info {:?} {:?}", entity, material_info);
+        let material_full_path = format!("{}#{}", material_info.path, material_info.name);
+        if blenvy_config
+            .materials_cache
+            .contains_key(&material_full_path)
+        {
+            debug!("material is cached, retrieving");
+            blenvy_config
+                .materials_cache
+                .get(&material_full_path)
+                .expect("we should have the material available");
+            commands
+                .entity(entity)
+                .insert(BlueprintMaterialAssetsLoaded);
+        } else {
+            let material_file_handle = asset_server.load_untyped(&material_info.path.clone()); // : Handle<Gltf> 
+            let material_file_id = material_file_handle.id();
+            
+            let asset_infos: Vec<AssetLoadTracker> = vec![AssetLoadTracker {
+                name: material_info.name.clone(),
+                id: material_file_id,
+                loaded: false,
+                handle: material_file_handle.clone(),
+            }];
+
+            commands
+                .entity(entity)
+                .insert(AssetsToLoad {
+                    all_loaded: false,
+                    asset_infos,
+                    ..Default::default()
+                })
+                .insert(BlueprintMaterialAssetsNotLoaded);
+           
+        }
+    }
+}
+
+// TODO, merge with blueprints_check_assets_loading, make generic ?
+pub(crate) fn check_for_material_loaded(
+    mut blueprint_assets_to_load: Query<
+        (Entity, &mut AssetsToLoad),
+        With<BlueprintMaterialAssetsNotLoaded>,
+    >,
+    asset_server: Res<AssetServer>,
+    mut commands: Commands,
+) {
+    for (entity, mut assets_to_load) in blueprint_assets_to_load.iter_mut() {
+        let mut all_loaded = true;
+        let mut loaded_amount = 0;
+        let total = assets_to_load.asset_infos.len();
+        for tracker in assets_to_load.asset_infos.iter_mut() {
+            let asset_id = tracker.id;
+            let loaded = asset_server.is_loaded_with_dependencies(asset_id);
+            tracker.loaded = loaded;
+            if loaded {
+                loaded_amount += 1;
+            } else {
+                all_loaded = false;
+            }
+        }
+        let progress: f32 = loaded_amount as f32 / total as f32;
+        assets_to_load.progress = progress;
+
+        if all_loaded {
+            assets_to_load.all_loaded = true;
+            commands
+                .entity(entity)
+                .insert(BlueprintMaterialAssetsLoaded)
+                .remove::<BlueprintMaterialAssetsNotLoaded>();
+        }
+    }
+}
+
+/// system that injects / replaces materials from material library
+pub(crate) fn materials_inject2(
+    mut blenvy_config: ResMut<BlenvyConfig>,
+    material_infos: Query<
+        (&MaterialInfo, &Children),
+        (
+            Added<BlueprintMaterialAssetsLoaded>,
+            With<BlueprintMaterialAssetsLoaded>,
+        ),
+    >,
+    with_materials_and_meshes: Query<
+        (),
+        (
+            With<Parent>,
+            With<Handle<StandardMaterial>>,
+            With<Handle<Mesh>>,
+        ),
+    >,
+    assets_gltf: Res<Assets<Gltf>>,
+    asset_server: Res<AssetServer>,
+
+    mut commands: Commands,
+) {
+    for (material_info, children) in material_infos.iter() {
+        let material_full_path = format!("{}#{}", material_info.path, material_info.name);
+        let mut material_found: Option<&Handle<StandardMaterial>> = None;
+
+        if blenvy_config
+            .materials_cache
+            .contains_key(&material_full_path)
+        {
+            debug!("material is cached, retrieving");
+            let material = blenvy_config
+                .materials_cache
+                .get(&material_full_path)
+                .expect("we should have the material available");
+            material_found = Some(material);
+        } else {
+            let model_handle: Handle<Gltf> = asset_server.load(material_info.path.clone()); // FIXME: kinda weird now
+            let mat_gltf = assets_gltf
+                .get(model_handle.id())
+                .expect("material should have been preloaded");
+            if mat_gltf.named_materials.contains_key(&material_info.name as &str) {
+                let material = mat_gltf
+                    .named_materials
+                    .get(&material_info.name as &str)
+                    .expect("this material should have been loaded");
+                blenvy_config
+                    .materials_cache
+                    .insert(material_full_path, material.clone());
+                material_found = Some(material);
+            }
+        }
+
+        if let Some(material) = material_found {
+            for child in children.iter() {
+                if with_materials_and_meshes.contains(*child) {
+                    debug!(
+                        "injecting material {}, path: {:?}",
+                        material_info.name,
+                        material_info.path.clone()
+                    );
+
+                    commands.entity(*child).insert(material.clone());
+                }
+            }
+        }
+    }
+}

crates/blenvy/src/blueprints/mod.rs

@@ -0,0 +1,172 @@
+pub mod spawn_from_blueprints;
+pub use spawn_from_blueprints::*;
+
+pub mod spawn_post_process;
+pub(crate) use spawn_post_process::*;
+
+pub mod animation;
+pub use animation::*;
+
+pub mod aabb;
+pub use aabb::*;
+
+pub mod assets;
+pub use assets::*;
+
+pub mod materials;
+pub use materials::*;
+
+pub mod copy_components;
+pub use copy_components::*;
+
+use core::fmt;
+use std::path::PathBuf;
+
+use bevy::{prelude::*, render::primitives::Aabb, utils::HashMap};
+
+use crate::{BlenvyConfig, GltfComponentsSet};
+
+#[derive(SystemSet, Debug, Hash, PartialEq, Eq, Clone)]
+/// set for the two stages of blueprint based spawning :
+pub enum GltfBlueprintsSet {
+    Spawn,
+    AfterSpawn,
+}
+
+#[derive(Bundle)]
+pub struct BluePrintBundle {
+    pub blueprint: BlueprintName,
+    pub blueprint_path: BlueprintPath,
+    pub spawn_here: SpawnHere,
+}
+impl Default for BluePrintBundle {
+    fn default() -> Self {
+        BluePrintBundle {
+            blueprint: BlueprintName("default".into()),
+            blueprint_path: BlueprintPath("".into()),
+            spawn_here: SpawnHere,
+        }
+    }
+}
+
+
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash, Default)]
+pub enum GltfFormat {
+    #[default]
+    GLB,
+    GLTF,
+}
+
+impl fmt::Display for GltfFormat {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            GltfFormat::GLB => {
+                write!(f, "glb",)
+            }
+            GltfFormat::GLTF => {
+                write!(f, "gltf")
+            }
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+/// Plugin for gltf blueprints
+pub struct BlueprintsPlugin {
+    /// Automatically generate aabbs for the blueprints root objects
+    pub aabbs: bool,
+    ///
+    pub material_library: bool,
+}
+
+impl Default for BlueprintsPlugin {
+    fn default() -> Self {
+        Self {
+            aabbs: false,
+            material_library: false
+        }
+    }
+}
+
+fn aabbs_enabled(blenvy_config: Res<BlenvyConfig>) -> bool {
+    blenvy_config.aabbs
+}
+
+
+impl Plugin for BlueprintsPlugin {
+    fn build(&self, app: &mut App) {
+        app
+            .register_type::<BlueprintName>()
+            .register_type::<BlueprintPath>()
+            .register_type::<MaterialInfo>()
+            .register_type::<SpawnHere>()
+            .register_type::<BlueprintAnimations>()
+            .register_type::<SceneAnimations>()
+            .register_type::<AnimationInfo>()
+            .register_type::<AnimationInfos>()
+            .register_type::<Vec<AnimationInfo>>()
+            .register_type::<AnimationMarkers>()
+            .register_type::<HashMap<u32, Vec<String>>>()
+            .register_type::<HashMap<String, HashMap<u32, Vec<String>>>>()
+            .add_event::<AnimationMarkerReached>()
+            .register_type::<MyAsset>()
+            .register_type::<Vec<MyAsset>>()
+            .register_type::<Vec<String>>()
+            .register_type::<LocalAssets>()
+            .register_type::<AllAssets>()
+
+            .add_event::<BlueprintEvent>()
+
+
+
+            .register_type::<HashMap<String, Vec<String>>>()
+            .configure_sets(
+                Update,
+                (GltfBlueprintsSet::Spawn, GltfBlueprintsSet::AfterSpawn)
+                    .chain()
+                    .after(GltfComponentsSet::Injection),
+            )
+            .add_systems(
+                Update,
+                (
+                    blueprints_prepare_spawn,
+                    blueprints_check_assets_loading,
+                    blueprints_spawn,
+
+                    /*(
+                        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()
+                    .in_set(GltfBlueprintsSet::Spawn),
+            )
+            .add_systems(
+                Update,
+                (spawned_blueprint_post_process, apply_deferred)
+                    .chain()
+                    .in_set(GltfBlueprintsSet::AfterSpawn),
+            )
+            /* .add_systems(
+                Update,
+                (
+                    trigger_instance_animation_markers_events,
+                    trigger_blueprint_animation_markers_events,
+                ),
+            )*/
+            ;
+    }
+}

crates/blenvy/src/blueprints/old.rs

@@ -0,0 +1,248 @@
+
+
+/// helper component, for tracking loaded assets's loading state, id , handle etc
+#[derive(Default, Debug)]
+pub(crate) struct AssetLoadTracker<T: bevy::prelude::Asset> {
+    #[allow(dead_code)]
+    pub name: String,
+    pub id: AssetId<T>,
+    pub loaded: bool,
+    #[allow(dead_code)]
+    pub handle: Handle<T>,
+}
+
+/// helper component, for tracking loaded assets
+#[derive(Component, Debug)]
+pub(crate) struct AssetsToLoad<T: bevy::prelude::Asset> {
+    pub all_loaded: bool,
+    pub asset_infos: Vec<AssetLoadTracker<T>>,
+    pub progress: f32,
+}
+impl<T: bevy::prelude::Asset> Default for AssetsToLoad<T> {
+    fn default() -> Self {
+        Self {
+            all_loaded: Default::default(),
+            asset_infos: Default::default(),
+            progress: Default::default(),
+        }
+    }
+}
+
+/// flag component, usually added when a blueprint is loaded
+#[derive(Component)]
+pub(crate) struct BlueprintAssetsLoaded;
+/// flag component
+#[derive(Component)]
+pub(crate) struct BlueprintAssetsNotLoaded;
+
+
+
+/// spawning prepare function,
+/// * also takes into account the already exisiting "override" components, ie "override components" > components from blueprint
+pub(crate) fn prepare_blueprints(
+    spawn_placeholders: Query<
+        (
+            Entity,
+            &BlueprintName,
+            Option<&Parent>,
+            Option<&Library>,
+            Option<&Name>,
+            Option<&BlueprintsList>,
+        ),
+        (Added<BlueprintName>, Added<SpawnHere>, Without<Spawned>),
+    >,
+
+    mut commands: Commands,
+    asset_server: Res<AssetServer>,
+    blenvy_config: Res<BluePrintsConfig>,
+) {
+    for (entity, blupeprint_name, original_parent, library_override, name, blueprints_list) in
+        spawn_placeholders.iter()
+    {
+        debug!(
+            "requesting to spawn {:?} for entity {:?}, id: {:?}, parent:{:?}",
+            blupeprint_name.0, name, entity, original_parent
+        );
+
+        // println!("main model path {:?}", model_path);
+        if blueprints_list.is_some() {
+            let blueprints_list = blueprints_list.unwrap();
+            // println!("blueprints list {:?}", blueprints_list.0.keys());
+            let mut asset_infos: Vec<AssetLoadTracker<Gltf>> = vec![];
+            let library_path =
+                library_override.map_or_else(|| &blenvy_config.library_folder, |l| &l.0);
+            for (blueprint_name, _) in blueprints_list.0.iter() {
+                let model_file_name = format!("{}.{}", &blueprint_name, &blenvy_config.format);
+                let model_path = Path::new(&library_path).join(Path::new(model_file_name.as_str()));
+
+                let model_handle: Handle<Gltf> = asset_server.load(model_path.clone());
+                let model_id = model_handle.id();
+                let loaded = asset_server.is_loaded_with_dependencies(model_id);
+                if !loaded {
+                    asset_infos.push(AssetLoadTracker {
+                        name: model_path.to_string_lossy().into(),
+                        id: model_id,
+                        loaded: false,
+                        handle: model_handle.clone(),
+                    });
+                }
+            }
+            // if not all assets are already loaded, inject a component to signal that we need them to be loaded
+            if !asset_infos.is_empty() {
+                commands
+                    .entity(entity)
+                    .insert(AssetsToLoad {
+                        all_loaded: false,
+                        asset_infos,
+                        ..Default::default()
+                    })
+                    .insert(BlueprintAssetsNotLoaded);
+            } else {
+                commands.entity(entity).insert(BlueprintAssetsLoaded);
+            }
+        } else {
+            // in case there are no blueprintsList, we revert back to the old behaviour
+            commands.entity(entity).insert(BlueprintAssetsLoaded);
+        }
+    }
+}
+
+pub(crate) fn blueprints_check_assets_loading(
+    mut blueprint_assets_to_load: Query<
+        (Entity, &mut AssetsToLoad<Gltf>),
+        With<BlueprintAssetsNotLoaded>,
+    >,
+    asset_server: Res<AssetServer>,
+    mut commands: Commands,
+) {
+    for (entity, mut assets_to_load) in blueprint_assets_to_load.iter_mut() {
+        let mut all_loaded = true;
+        let mut loaded_amount = 0;
+        let total = assets_to_load.asset_infos.len();
+        for tracker in assets_to_load.asset_infos.iter_mut() {
+            let asset_id = tracker.id;
+            let loaded = asset_server.is_loaded_with_dependencies(asset_id);
+            tracker.loaded = loaded;
+            if loaded {
+                loaded_amount += 1;
+            } else {
+                all_loaded = false;
+            }
+        }
+        let progress: f32 = loaded_amount as f32 / total as f32;
+        // println!("progress: {}",progress);
+        assets_to_load.progress = progress;
+
+        if all_loaded {
+            assets_to_load.all_loaded = true;
+            commands
+                .entity(entity)
+                .insert(BlueprintAssetsLoaded)
+                .remove::<BlueprintAssetsNotLoaded>();
+        }
+    }
+}
+
+pub(crate) fn blueprints_spawn(
+    spawn_placeholders: Query<
+        (
+            Entity,
+            &BlueprintName,
+            Option<&Transform>,
+            Option<&Parent>,
+            Option<&Library>,
+            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>,
+    blenvy_config: Res<BluePrintsConfig>,
+
+    children: Query<&Children>,
+) {
+    for (
+        entity,
+        blupeprint_name,
+        transform,
+        original_parent,
+        library_override,
+        add_to_world,
+        name,
+    ) in spawn_placeholders.iter()
+    {
+        debug!(
+            "attempting to spawn {:?} for entity {:?}, id: {:?}, parent:{:?}",
+            blupeprint_name.0, name, entity, original_parent
+        );
+
+        let what = &blupeprint_name.0;
+        let model_file_name = format!("{}.{}", &what, &blenvy_config.format);
+
+        // library path is either defined at the plugin level or overriden by optional Library components
+        let library_path =
+            library_override.map_or_else(|| &blenvy_config.library_folder, |l| &l.0);
+        let model_path = Path::new(&library_path).join(Path::new(model_file_name.as_str()));
+
+        // info!("attempting to spawn {:?}", model_path);
+        let model_handle: Handle<Gltf> = asset_server.load(model_path.clone()); // FIXME: kinda weird now
+
+        let gltf = assets_gltf.get(&model_handle).unwrap_or_else(|| {
+            panic!(
+                "gltf file {:?} should have been loaded",
+                model_path.to_str()
+            )
+        });
+
+        // WARNING we work under the assumtion that there is ONLY ONE named scene, and that the first one is the right one
+        let main_scene_name = gltf
+            .named_scenes
+            .keys()
+            .next()
+            .expect("there should be at least one named scene in the gltf file to spawn");
+
+        let scene = &gltf.named_scenes[main_scene_name];
+
+        // transforms are optional, but still deal with them correctly
+        let mut transforms: Transform = Transform::default();
+        if transform.is_some() {
+            transforms = *transform.unwrap();
+        }
+
+        let mut original_children: Vec<Entity> = vec![];
+        if let Ok(c) = children.get(entity) {
+            for child in c.iter() {
+                original_children.push(*child);
+            }
+        }
+        commands.entity(entity).insert((
+            SceneBundle {
+                scene: scene.clone(),
+                transform: transforms,
+                ..Default::default()
+            },
+            Spawned,
+            OriginalChildren(original_children),
+            BlueprintAnimations {
+                // these are animations specific to the inside of the blueprint
+                named_animations: gltf.named_animations.clone(),
+            },
+        ));
+
+        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);
+        }
+    }
+}

crates/blenvy/src/blueprints/spawn_from_blueprints.rs

@@ -0,0 +1,365 @@
+use std::path::{Path, PathBuf};
+
+use bevy::{gltf::Gltf, prelude::*, utils::hashbrown::HashMap};
+
+use crate::{AllAssets, AssetsToLoad, AssetLoadTracker, BlenvyConfig, BlueprintAnimations, BlueprintAssetsLoaded, BlueprintAssetsNotLoaded};
+
+/// this is a flag component for our levels/game world
+#[derive(Component)]
+pub struct GameWorldTag;
+
+/// Main component for the blueprints
+#[derive(Component, Reflect, Default, Debug)]
+#[reflect(Component)]
+pub struct BlueprintName(pub String);
+
+/// path component for the blueprints
+#[derive(Component, Reflect, Default, Debug)]
+#[reflect(Component)]
+pub struct BlueprintPath(pub String);
+
+/// flag component needed to signify the intent to spawn a Blueprint
+#[derive(Component, Reflect, Default, Debug)]
+#[reflect(Component)]
+pub struct SpawnHere;
+
+#[derive(Component)]
+/// flag component for dynamically spawned scenes
+pub struct Spawned;
+
+
+#[derive(Component, Debug)]
+/// flag component added when a Blueprint instance ist Ready : ie : 
+/// - its assets have loaded
+/// - it has finished spawning
+pub struct BlueprintInstanceReady;
+
+#[derive(Component, Reflect, Default, Debug)]
+#[reflect(Component)]
+/// flag component marking any spwaned child of blueprints ..unless the original entity was marked with the `NoInBlueprint` marker component
+pub struct InBlueprint;
+
+#[derive(Component, Reflect, Default, Debug)]
+#[reflect(Component)]
+/// flag component preventing any spawned child of blueprints to be marked with the `InBlueprint` component
+pub struct NoInBlueprint;
+
+#[derive(Component, Reflect, Default, Debug)]
+#[reflect(Component)]
+// this allows overriding the default library path for a given entity/blueprint
+pub struct Library(pub PathBuf);
+
+#[derive(Component, Reflect, Default, Debug)]
+#[reflect(Component)]
+/// flag component to force adding newly spawned entity as child of game world
+pub struct AddToGameWorld;
+
+#[derive(Component)]
+/// helper component, just to transfer child data
+pub(crate) struct OriginalChildren(pub Vec<Entity>);
+
+
+#[derive(Event, Debug)]
+pub enum BlueprintEvent {
+
+    /// event fired when a blueprint has finished loading its assets & before it attempts spawning
+    AssetsLoaded {
+        blueprint_name: String,
+        blueprint_path: String,
+        // TODO: add assets list ?
+    },
+    /// event fired when a blueprint is COMPLETELY done spawning ie
+    /// - all its assets have been loaded
+    /// - the spawning attempt has been sucessfull
+    Spawned {
+        blueprint_name: String,
+        blueprint_path: String,
+    },
+
+    /// 
+    Ready {
+        blueprint_path: String,
+    }
+    
+}
+
+pub(crate) fn blueprints_prepare_spawn(
+    spawn_placeholders: Query<
+    (
+        Entity,
+        &BlueprintPath,
+    ),
+    (Added<BlueprintPath>, Without<Spawned>, Without<SpawnHere>)>,
+
+    // before 0.14 we have to use a seperate query, after migrating we can query at the root level
+    entities_with_assets: Query<
+        (
+            Entity,
+            /*&BlueprintName,
+            &BlueprintPath,
+            Option<&Parent>,*/
+            Option<&Name>,
+            Option<&AllAssets>,
+        ),
+        (Added<AllAssets>), //  Added<AllAssets>
+    >,
+
+
+    bla_bla : Query<
+    (
+        Entity,
+        &BlueprintName,
+        &BlueprintPath,
+        Option<&Parent>,
+        Option<&AllAssets>,
+    ),(Added<BlueprintPath>)
+    >,
+mut commands: Commands,
+asset_server: Res<AssetServer>,
+
+
+) {
+    for (entity, blueprint_path) in spawn_placeholders.iter() {
+        //println!("added blueprint_path {:?}", blueprint_path);
+        /*commands.entity(entity).insert(
+            SceneBundle {
+                scene: asset_server.load(format!("{}#Scene0", &blueprint_path.0)), // "levels/World.glb#Scene0"),
+                ..default()
+            },
+        );*/
+        // let model_handle: Handle<Gltf> = asset_server.load(model_path.clone());
+    }
+
+    for (entity, blueprint_name, blueprint_path, parent, all_assets) in bla_bla.iter() {
+        println!("added blueprint to spawn {:?} {:?}", blueprint_name, blueprint_path);
+        // println!("all assets {:?}", all_assets);
+        let untyped_handle = asset_server.load_untyped(&blueprint_path.0);
+        let asset_id = untyped_handle.id();
+        let loaded = asset_server.is_loaded_with_dependencies(asset_id);
+
+        let mut asset_infos: Vec<AssetLoadTracker> = vec![];
+        if !loaded {
+            asset_infos.push(AssetLoadTracker {
+                name: blueprint_name.0.clone(),
+                id: asset_id,
+                loaded: false,
+                handle: untyped_handle.clone(),
+            });
+        }
+
+        // now insert load tracker
+        if !asset_infos.is_empty() {
+            commands
+                .entity(entity)
+                .insert(AssetsToLoad {
+                    all_loaded: false,
+                    asset_infos,
+                    ..Default::default()
+                })
+                .insert(BlueprintAssetsNotLoaded);
+        } else {
+            commands.entity(entity).insert(BlueprintAssetsLoaded);
+        }
+    }
+
+    for (child_entity, child_entity_name, all_assets) in entities_with_assets.iter(){
+        println!("added assets {:?} to {:?}", all_assets, child_entity_name);
+        if all_assets.is_some() {
+            let mut asset_infos: Vec<AssetLoadTracker> = vec![];
+
+            for asset in all_assets.unwrap().0.iter() {
+                let untyped_handle = asset_server.load_untyped(&asset.path);
+                //println!("untyped handle {:?}", untyped_handle);
+                //asset_server.load(asset.path);
+
+                let asset_id = untyped_handle.id();
+                //println!("ID {:?}", asset_id);
+                let loaded = asset_server.is_loaded_with_dependencies(asset_id);
+                //println!("Loaded ? {:?}", loaded);
+                if !loaded {
+                    asset_infos.push(AssetLoadTracker {
+                        name: asset.name.clone(),
+                        id: asset_id,
+                        loaded: false,
+                        handle: untyped_handle.clone(),
+                    });
+                }
+            }
+
+            // now insert load tracker
+            if !asset_infos.is_empty() {
+                commands
+                    .entity(child_entity)
+                    .insert(AssetsToLoad {
+                        all_loaded: false,
+                        asset_infos,
+                        ..Default::default()
+                    })
+                    .insert(BlueprintAssetsNotLoaded);
+            } else {
+                commands.entity(child_entity).insert(BlueprintAssetsLoaded);
+            }
+        }
+    }
+}
+
+pub(crate) fn blueprints_check_assets_loading(
+    mut blueprint_assets_to_load: Query<
+        (Entity, Option<&Name>, &BlueprintPath, &mut AssetsToLoad),
+        With<BlueprintAssetsNotLoaded>,
+    >,
+    asset_server: Res<AssetServer>,
+    mut commands: Commands,
+    mut blueprint_events: EventWriter<BlueprintEvent>,
+
+) {
+    for (entity, entity_name, blueprint_path, mut assets_to_load) in blueprint_assets_to_load.iter_mut() {
+        let mut all_loaded = true;
+        let mut loaded_amount = 0;
+        let total = assets_to_load.asset_infos.len();
+        for tracker in assets_to_load.asset_infos.iter_mut() {
+            let asset_id = tracker.id;
+            let loaded = asset_server.is_loaded_with_dependencies(asset_id);
+            println!("loading {}: // load state: {:?}", tracker.name, asset_server.load_state(asset_id));
+
+            // FIXME: hack for now
+            let mut failed = false;// asset_server.load_state(asset_id) == bevy::asset::LoadState::Failed(_error);
+            match asset_server.load_state(asset_id) {
+                bevy::asset::LoadState::Failed(_) => {
+                    failed = true
+                },
+                _ => {}
+            }
+            tracker.loaded = loaded || failed;
+            if loaded || failed {
+                loaded_amount += 1;
+            } else {
+                all_loaded = false;
+            }
+        }
+        let progress: f32 = loaded_amount as f32 / total as f32;
+        println!("progress: {}",progress);
+        assets_to_load.progress = progress;
+
+        if all_loaded {
+            assets_to_load.all_loaded = true;
+            println!("done with loading {:?}, inserting components", entity_name);
+            blueprint_events.send(BlueprintEvent::AssetsLoaded {blueprint_name:"".into(), blueprint_path: blueprint_path.0.clone() });
+
+            commands
+                .entity(entity)
+                .insert(BlueprintAssetsLoaded)
+                .remove::<BlueprintAssetsNotLoaded>()
+                .remove::<AssetsToLoad>()
+                ;
+        }
+    }
+}
+
+
+
+pub(crate) fn blueprints_spawn(
+    spawn_placeholders: Query<
+        (
+            Entity,
+            &BlueprintName,
+            &BlueprintPath,
+            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>,
+) {
+    for (
+        entity,
+        blupeprint_name,
+        blueprint_path,
+        transform,
+        original_parent,
+        add_to_world,
+        name,
+    ) in spawn_placeholders.iter()
+    {
+        info!(
+            "attempting to spawn blueprint {:?} for entity {:?}, id: {:?}, parent:{:?}",
+            blupeprint_name.0, name, entity, original_parent
+        );
+
+        // info!("attempting to spawn {:?}", model_path);
+        let model_handle: Handle<Gltf> = asset_server.load(blueprint_path.0.clone()); // FIXME: kinda weird now
+
+        let gltf = assets_gltf.get(&model_handle).unwrap_or_else(|| {
+            panic!(
+                "gltf file {:?} should have been loaded",
+                &blueprint_path.0
+            )
+        });
+
+        // WARNING we work under the assumtion that there is ONLY ONE named scene, and that the first one is the right one
+        let main_scene_name = gltf
+            .named_scenes
+            .keys()
+            .next()
+            .expect("there should be at least one named scene in the gltf file to spawn");
+
+        let scene = &gltf.named_scenes[main_scene_name];
+
+        // transforms are optional, but still deal with them correctly
+        let mut transforms: Transform = Transform::default();
+        if transform.is_some() {
+            transforms = *transform.unwrap();
+        }
+
+        let mut original_children: Vec<Entity> = vec![];
+        if let Ok(c) = children.get(entity) {
+            for child in c.iter() {
+                original_children.push(*child);
+            }
+        }
+
+        let mut named_animations:HashMap<String, Handle<AnimationClip>> = HashMap::new() ;
+        for (key, value) in gltf.named_animations.iter() {
+            named_animations.insert(key.to_string(), value.clone());
+        }
+
+        commands.entity(entity).insert((
+            SceneBundle {
+                scene: scene.clone(),
+                transform: transforms,
+                ..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() {
+            let world = game_world
+                .get_single_mut()
+                .expect("there should be a game world present");
+            commands.entity(world).add_child(entity);
+        }
+    }
+}
+
+
+
+
+

crates/blenvy/src/blueprints/spawn_post_process.rs

@@ -0,0 +1,110 @@
+use std::any::TypeId;
+
+use bevy::gltf::Gltf;
+use bevy::prelude::*;
+use bevy::scene::SceneInstance;
+// use bevy::utils::hashbrown::HashSet;
+
+use crate::{BlueprintAnimationPlayerLink, BlueprintAnimations, BlueprintPath};
+use crate::{SpawnHere, Spawned};
+use crate::{
+    AssetsToLoad, BlueprintAssetsLoaded, BlueprintEvent, CopyComponents, InBlueprint, NoInBlueprint, OriginalChildren
+};
+
+
+
+/// 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(
+    unprocessed_entities: Query<
+        (
+            Entity,
+            &Children,
+            &OriginalChildren,
+            &BlueprintAnimations,
+            Option<&NoInBlueprint>,
+            Option<&Name>,
+            &BlueprintPath
+        ),
+        (With<SpawnHere>, With<SceneInstance>, With<Spawned>),
+    >,
+    added_animation_players: Query<(Entity, &Parent), Added<AnimationPlayer>>,
+    all_children: Query<&Children>,
+
+    mut commands: Commands,
+    mut blueprint_events: EventWriter<BlueprintEvent>,
+
+) {
+    for (original, children, original_children, animations, no_inblueprint, name, blueprint_path) in
+        unprocessed_entities.iter()
+    {
+        info!("post processing blueprint for entity {:?}", 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 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 c in children.iter() {
+            if !original_children.0.contains(c) {
+                root_entity = *c;
+                break;
+            }
+        }
+
+        // we flag all children of the blueprint instance with 'InBlueprint'
+        // 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);
+            }
+        }
+
+        // copy components into from blueprint instance's root_entity to original entity
+        commands.add(CopyComponents {
+            source: 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
+        if let Ok(root_entity_children) = all_children.get(root_entity) {
+            for child in root_entity_children.iter() {
+                // info!("copying child {:?} upward from {:?} to {:?}", names.get(*child), root_entity, original);
+                commands.entity(original).add_child(*child);
+            }
+        }
+
+        if animations.named_animations.keys().len() > 0 {
+            for (added, parent) in added_animation_players.iter() {
+                if parent.get() == root_entity {
+                    // FIXME: stopgap solution: since we cannot use an AnimationPlayer at the root entity level
+                    // and we cannot update animation clips so that the EntityPaths point to one level deeper,
+                    // BUT we still want to have some marker/control at the root entity level, we add this
+                    commands
+                        .entity(original)
+                        .insert(BlueprintAnimationPlayerLink(added));
+                }
+            }
+        }
+
+        commands.entity(original).remove::<SpawnHere>();
+        commands.entity(original).remove::<Spawned>();
+        // 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::<AssetsToLoad>(); // 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();
+
+        blueprint_events.send(BlueprintEvent::Spawned {blueprint_name:"".into(), blueprint_path: blueprint_path.0.clone() });
+        
+        debug!("DONE WITH POST PROCESS");
+    }
+}

crates/blenvy/src/components/mod.rs

@@ -0,0 +1,74 @@
+pub mod utils;
+pub use utils::*;
+
+pub mod ronstring_to_reflect_component;
+pub use ronstring_to_reflect_component::*;
+
+pub mod process_gltfs;
+pub use process_gltfs::*;
+
+pub mod blender_settings;
+
+use bevy::{
+    ecs::{component::Component, reflect::ReflectComponent, system::Resource},
+    prelude::{App, IntoSystemConfigs, Plugin, SystemSet, Update},
+    reflect::Reflect,
+};
+
+/// A Bevy plugin for extracting components from gltf files and automatically adding them to the relevant entities
+/// It will automatically run every time you load a gltf file
+/// Add this plugin to your Bevy app to get access to this feature
+/// ```
+/// # use bevy::prelude::*;
+/// # use bevy::gltf::*;
+/// # use bevy_gltf_components::ComponentsFromGltfPlugin;
+///
+/// //too barebones of an example to be meaningfull, please see https://github.com/kaosat-dev/Blender_bevy_components_workflow/examples/basic for a real example
+/// fn main() {
+///    App::new()
+///         .add_plugins(DefaultPlugins)
+///         .add_plugin(ComponentsFromGltfPlugin)
+///         .add_system(spawn_level)
+///         .run();
+/// }
+///
+/// fn spawn_level(
+///   asset_server: Res<AssetServer>,
+///   mut commands: bevy::prelude::Commands,
+///   keycode: Res<Input<KeyCode>>,
+
+/// ){
+/// if keycode.just_pressed(KeyCode::Return) {
+///  commands.spawn(SceneBundle {
+///   scene: asset_server.load("basic/models/level1.glb"),
+///   transform: Transform::from_xyz(2.0, 0.0, -5.0),
+/// ..Default::default()
+/// });
+/// }
+///}
+/// ```
+
+/// this is a flag component to tag a processed gltf, to avoid processing things multiple times
+#[derive(Component, Reflect, Default, Debug)]
+#[reflect(Component)]
+pub struct GltfProcessed;
+
+#[derive(SystemSet, Debug, Hash, PartialEq, Eq, Clone)]
+/// systemset to order your systems after the component injection when needed
+pub enum GltfComponentsSet {
+    Injection,
+}
+
+#[derive(Default)]
+pub struct ComponentsFromGltfPlugin {}
+
+impl Plugin for ComponentsFromGltfPlugin {
+    fn build(&self, app: &mut App) {
+        app.add_plugins(blender_settings::plugin)
+            .register_type::<GltfProcessed>()
+            .add_systems(
+                Update,
+                (add_components_from_gltf_extras).in_set(GltfComponentsSet::Injection),
+            );
+    }
+}

crates/blenvy/src/components/process_gltfs.rs

@@ -15,7 +15,8 @@ use bevy::{
 
 use crate::{ronstring_to_reflect_component, GltfProcessed};
 
-fn bla_balb(entity: Entity, name: &Name, parent: &Parent, reflect_components: Vec<(Box<dyn Reflect>, TypeRegistration)>, mut entity_components: HashMap<Entity, Vec<(Box<dyn Reflect>, TypeRegistration)>>){
+// , mut entity_components: HashMap<Entity, Vec<(Box<dyn Reflect>, TypeRegistration)>>
+fn find_entity_components(entity: Entity, name: &Name, parent: &Parent, reflect_components: Vec<(Box<dyn Reflect>, TypeRegistration)>, entity_components: &HashMap<Entity, Vec<(Box<dyn Reflect>, TypeRegistration)>>) -> (Entity, Vec<(Box<dyn Reflect>, TypeRegistration)>){
      // we assign the components specified /xxx_components objects to their parent node
      let mut target_entity = entity;
      // if the node contains "components" or ends with "_pa" (ie add to parent), the components will not be added to the entity itself but to its parent
@@ -39,9 +40,11 @@ fn bla_balb(entity: Entity, name: &Name, parent: &Parent, reflect_components: Ve
          for (component, type_registration) in reflect_components {
              updated_components.push((component.clone_value(), type_registration));
          }
-         entity_components.insert(target_entity, updated_components);
+         return (target_entity, updated_components)
+         //entity_components.insert(target_entity, updated_components);
      } else {
-         entity_components.insert(target_entity, reflect_components);
+        return  (target_entity, reflect_components);
+         // entity_components.insert(target_entity, reflect_components);
      }
 }
 
@@ -69,38 +72,54 @@ pub fn add_components_from_gltf_extras(world: &mut World) {
         let type_registry = type_registry.read();
         let reflect_components = ronstring_to_reflect_component(&extra.value, &type_registry);
 
-        bla_balb(entity, name, parent, reflect_components, entity_components);
-
-        /*
-        // we assign the components specified /xxx_components objects to their parent node
-        let mut target_entity = entity;
-        // if the node contains "components" or ends with "_pa" (ie add to parent), the components will not be added to the entity itself but to its parent
-        // this is mostly used for Blender collections
-        if name.as_str().contains("components") || name.as_str().ends_with("_pa") {
-            debug!("adding components to parent");
-            target_entity = parent.get();
-        }
-        debug!("adding to {:?}", target_entity);
-
-        // if there where already components set to be added to this entity (for example when entity_data was refering to a parent), update the vec of entity_components accordingly
-        // this allows for example blender collection to provide basic ecs data & the instances to override/ define their own values
-        if entity_components.contains_key(&target_entity) {
-            let mut updated_components: Vec<(Box<dyn Reflect>, TypeRegistration)> = Vec::new();
-            let current_components = &entity_components[&target_entity];
-            // first inject the current components
-            for (component, type_registration) in current_components {
-                updated_components.push((component.clone_value(), type_registration.clone()));
-            }
-            // then inject the new components: this also enables overwrite components set in the collection
-            for (component, type_registration) in reflect_components {
-                updated_components.push((component.clone_value(), type_registration));
-            }
-            entity_components.insert(target_entity, updated_components);
-        } else {
-            entity_components.insert(target_entity, reflect_components);
-        } */
+        let (target_entity, updated_components) = find_entity_components(entity, name, parent, reflect_components, &entity_components);
+        entity_components.insert(target_entity, updated_components);
     }
 
+
+    for (entity, name, extra, parent) in scene_extras.iter(world) {
+        debug!(
+            "Name: {}, entity {:?}, parent: {:?}, scene_extras {:?}",
+            name, entity, parent, extra
+        );
+
+        let type_registry: &AppTypeRegistry = world.resource();
+        let type_registry = type_registry.read();
+        let reflect_components = ronstring_to_reflect_component(&extra.value, &type_registry);
+
+        let (target_entity, updated_components) = find_entity_components(entity, name, parent, reflect_components, &entity_components);
+        entity_components.insert(target_entity, updated_components);
+    }
+
+    for (entity, name, extra, parent) in mesh_extras.iter(world) {
+        debug!(
+            "Name: {}, entity {:?}, parent: {:?}, mesh_extras {:?}",
+            name, entity, parent, extra
+        );
+
+        let type_registry: &AppTypeRegistry = world.resource();
+        let type_registry = type_registry.read();
+        let reflect_components = ronstring_to_reflect_component(&extra.value, &type_registry);
+
+        let (target_entity, updated_components) = find_entity_components(entity, name, parent, reflect_components, &entity_components);
+        entity_components.insert(target_entity, updated_components);
+    }
+
+    for (entity, name, extra, parent) in material_extras.iter(world) {
+        debug!(
+            "Name: {}, entity {:?}, parent: {:?}, material_extras {:?}",
+            name, entity, parent, extra
+        );
+
+        let type_registry: &AppTypeRegistry = world.resource();
+        let type_registry = type_registry.read();
+        let reflect_components = ronstring_to_reflect_component(&extra.value, &type_registry);
+
+        let (target_entity, updated_components) = find_entity_components(entity, name, parent, reflect_components, &entity_components);
+        entity_components.insert(target_entity, updated_components);
+    }
+
+
     for (entity, components) in entity_components {
         let type_registry: &AppTypeRegistry = world.resource();
         let type_registry = type_registry.clone();

crates/blenvy/src/lib.rs

@@ -1,78 +1,71 @@
-pub mod utils;
-pub use utils::*;
+use std::path::PathBuf;
+use bevy::{prelude::*, render::primitives::Aabb, utils::HashMap};
 
-pub mod ronstring_to_reflect_component;
-pub use ronstring_to_reflect_component::*;
+pub mod components;
+pub use components::*;
 
-pub mod process_gltfs;
-pub use process_gltfs::*;
+pub mod registry;
+pub use registry::*;
 
-pub mod blender_settings;
-
-use bevy::{
-    ecs::{component::Component, reflect::ReflectComponent, system::Resource},
-    prelude::{App, IntoSystemConfigs, Plugin, SystemSet, Update},
-    reflect::Reflect,
-};
-
-/// A Bevy plugin for extracting components from gltf files and automatically adding them to the relevant entities
-/// It will automatically run every time you load a gltf file
-/// Add this plugin to your Bevy app to get access to this feature
-/// ```
-/// # use bevy::prelude::*;
-/// # use bevy::gltf::*;
-/// # use bevy_gltf_components::ComponentsFromGltfPlugin;
-///
-/// //too barebones of an example to be meaningfull, please see https://github.com/kaosat-dev/Blender_bevy_components_workflow/examples/basic for a real example
-/// fn main() {
-///    App::new()
-///         .add_plugins(DefaultPlugins)
-///         .add_plugin(ComponentsFromGltfPlugin)
-///         .add_system(spawn_level)
-///         .run();
-/// }
-///
-/// fn spawn_level(
-///   asset_server: Res<AssetServer>,
-///   mut commands: bevy::prelude::Commands,
-///   keycode: Res<Input<KeyCode>>,
-
-/// ){
-/// if keycode.just_pressed(KeyCode::Return) {
-///  commands.spawn(SceneBundle {
-///   scene: asset_server.load("basic/models/level1.glb"),
-///   transform: Transform::from_xyz(2.0, 0.0, -5.0),
-/// ..Default::default()
-/// });
-/// }
-///}
-/// ```
-
-/// this is a flag component to tag a processed gltf, to avoid processing things multiple times
-#[derive(Component, Reflect, Default, Debug)]
-#[reflect(Component)]
-pub struct GltfProcessed;
-
-#[derive(SystemSet, Debug, Hash, PartialEq, Eq, Clone)]
-/// systemset to order your systems after the component injection when needed
-pub enum GltfComponentsSet {
-    Injection,
-}
+pub mod blueprints;
+pub use blueprints::*;
 
 #[derive(Clone, Resource)]
-pub struct GltfComponentsConfig {}
+pub struct BlenvyConfig {
+    // registry
+    pub(crate) registry_save_path: PathBuf,
+    pub(crate) registry_component_filter: SceneFilter,
+    #[allow(dead_code)]
+    pub(crate) registry_resource_filter: SceneFilter,
 
-#[derive(Default)]
-pub struct ComponentsFromGltfPlugin {}
+    // blueprints
+    pub(crate) aabbs: bool,
+    pub(crate) aabb_cache: HashMap<String, Aabb>, // cache for aabbs
+    pub(crate) materials_cache: HashMap<String, Handle<StandardMaterial>>, // cache for materials
+}
 
-impl Plugin for ComponentsFromGltfPlugin {
-    fn build(&self, app: &mut App) {
-        app.add_plugins(blender_settings::plugin)
-            .register_type::<GltfProcessed>()
-            .insert_resource(GltfComponentsConfig {})
-            .add_systems(
-                Update,
-                (add_components_from_gltf_extras).in_set(GltfComponentsSet::Injection),
-            );
+
+#[derive(Debug, Clone)]
+/// Plugin for gltf blueprints
+pub struct BlenvyPlugin {
+    pub registry_save_path: PathBuf,
+
+    pub registry_component_filter: SceneFilter,
+    pub registry_resource_filter: SceneFilter,
+
+    /// Automatically generate aabbs for the blueprints root objects
+    pub aabbs: bool,
+}
+
+impl Default for BlenvyPlugin {
+    fn default() -> Self {
+        Self {
+            registry_save_path: PathBuf::from("registry.json"), // relative to assets folder
+            registry_component_filter: SceneFilter::default(),
+            registry_resource_filter: SceneFilter::default(),
+            aabbs: false,
+        }
     }
 }
+
+impl Plugin for BlenvyPlugin {
+    fn build(&self, app: &mut App) {
+        app.add_plugins((
+            ComponentsFromGltfPlugin::default(), 
+            ExportRegistryPlugin::default(),
+            BlueprintsPlugin::default()
+        ))
+        .insert_resource(BlenvyConfig {
+            registry_save_path: self.registry_save_path.clone(),
+            registry_component_filter: self.registry_component_filter.clone(),
+            registry_resource_filter: self.registry_resource_filter.clone(),
+
+            aabbs: self.aabbs,
+            aabb_cache: HashMap::new(),
+
+            materials_cache: HashMap::new(),
+        })
+        ;
+
+    }
+}

crates/blenvy/src/registry/export_types.rs

@@ -0,0 +1,273 @@
+use std::{fs::File, path::Path};
+use bevy::{log::info, prelude::{AppTypeRegistry, ReflectComponent, ReflectResource, World}, reflect::{TypeInfo, TypeRegistration, VariantInfo}};
+use serde_json::{json, Map, Value};
+use crate::{AssetRoot, BlenvyConfig};
+
+pub fn export_types(world: &mut World) {
+    let config = world
+        .get_resource::<BlenvyConfig>()
+        .expect("ExportComponentsConfig should exist at this stage");
+
+    let asset_root = world.resource::<AssetRoot>();
+    let registry_save_path = Path::join(&asset_root.0, &config.registry_save_path);
+    let writer = File::create(registry_save_path).expect("should have created schema file");
+
+    let components_to_filter_out = &config.registry_component_filter.clone();
+    let resources_to_filter_out = &config.registry_resource_filter.clone();
+
+    let types = world.resource_mut::<AppTypeRegistry>();
+    let types = types.read();
+    let schemas = types
+        .iter()
+        .filter(|type_info| {
+            let type_id = type_info.type_id();
+            components_to_filter_out.is_allowed_by_id(type_id)
+                && resources_to_filter_out.is_allowed_by_id(type_id)
+        })
+        .map(export_type)
+        .collect::<Map<_, _>>();
+
+    serde_json::to_writer_pretty(
+        writer,
+        &json!({
+            "$schema": "https://json-schema.org/draft/2020-12/schema",
+            "long_name": "bevy component registry schema",
+            "$defs": schemas,
+        }),
+    )
+    .expect("valid json");
+
+    info!("Done exporting registry schema")
+}
+
+pub fn export_type(reg: &TypeRegistration) -> (String, Value) {
+    let t = reg.type_info();
+    let binding = t.type_path_table();
+    let short_name = binding.short_path();
+    let mut schema = match t {
+        TypeInfo::Struct(info) => {
+            let properties = info
+                .iter()
+                .enumerate()
+                .map(|(idx, field)| {
+                    (
+                        field.name().to_owned(),
+                        add_min_max(json!({ "type": typ(field.type_path()) }), reg, idx, None),
+                    )
+                })
+                .collect::<Map<_, _>>();
+
+            json!({
+                "type": "object",
+                "typeInfo": "Struct",
+                "long_name": t.type_path(),
+                "properties": properties,
+                "additionalProperties": false,
+                "required": info
+                    .iter()
+                    .filter(|field| !field.type_path().starts_with("core::option::Option"))
+                    .map(|field| field.name())
+                    .collect::<Vec<_>>(),
+            })
+        }
+        TypeInfo::Enum(info) => {
+            let simple = info
+                .iter()
+                .all(|variant| matches!(variant, VariantInfo::Unit(_)));
+            if simple {
+                json!({
+                    "type": "string",
+                    "typeInfo": "Enum",
+                    "long_name": t.type_path(),
+                    "oneOf": info
+                        .iter()
+                        .map(|variant| match variant {
+                            VariantInfo::Unit(v) => v.name(),
+                            _ => unreachable!(),
+                        })
+                        .collect::<Vec<_>>(),
+                })
+            } else {
+                let variants = info
+                .iter()
+                .enumerate()
+                .map(|(field_idx, variant)| match variant {
+                    //let binding = t.type_path_table();
+                    //let short_name = binding.short_path();
+                    VariantInfo::Struct(v) => json!({
+                        "type": "object",
+                        "typeInfo": "Struct",
+                        "long_name": v.name(),
+                        "short_name": v.name().split("::").last().unwrap_or(v.name()),
+                        "properties": v
+                            .iter()
+                            .enumerate()
+                            .map(|(variant_idx, field)| (field.name().to_owned(), add_min_max(json!({"type": typ(field.type_path()), "long_name": field.name()}), reg, field_idx, Some(variant_idx))))
+                            .collect::<Map<_, _>>(),
+                        "additionalProperties": false,
+                        "required": v
+                            .iter()
+                            .filter(|field| !field.type_path().starts_with("core::option::Option"))
+                            .map(|field| field.name())
+                            .collect::<Vec<_>>(),
+                    }),
+                    VariantInfo::Tuple(v) => json!({
+                        "type": "array",
+                        "typeInfo": "Tuple",
+                        "long_name": v.name(),
+                        "short_name":v.name(),
+                        "prefixItems": v
+                            .iter()
+                            .enumerate()
+                            .map(|(variant_idx, field)| add_min_max(json!({"type": typ(field.type_path())}), reg, field_idx, Some(variant_idx)))
+                            .collect::<Vec<_>>(),
+                        "items": false,
+                    }),
+                    VariantInfo::Unit(v) => json!({
+                        "long_name": v.name(),
+                    }),
+                })
+                .collect::<Vec<_>>();
+
+                json!({
+                    "type": "object",
+                    "typeInfo": "Enum",
+                    "long_name": t.type_path(),
+                    "oneOf": variants,
+                })
+            }
+        }
+        TypeInfo::TupleStruct(info) => json!({
+            "long_name": t.type_path(),
+            "type": "array",
+            "typeInfo": "TupleStruct",
+            "prefixItems": info
+                .iter()
+                .enumerate()
+                .map(|(idx, field)| add_min_max(json!({"type": typ(field.type_path())}), reg, idx, None))
+                .collect::<Vec<_>>(),
+            "items": false,
+        }),
+        TypeInfo::List(info) => {
+            json!({
+                "long_name": t.type_path(),
+                "type": "array",
+                "typeInfo": "List",
+                "items": json!({"type": typ(info.item_type_path_table().path())}),
+            })
+        }
+        TypeInfo::Array(info) => json!({
+            "long_name": t.type_path(),
+            "type": "array",
+            "typeInfo": "Array",
+            "items": json!({"type": typ(info.item_type_path_table().path())}),
+        }),
+        TypeInfo::Map(info) => json!({
+            "long_name": t.type_path(),
+            "type": "object",
+            "typeInfo": "Map",
+            "valueType": json!({"type": typ(info.value_type_path_table().path())}),
+            "keyType": json!({"type": typ(info.key_type_path_table().path())}),
+        }),
+        TypeInfo::Tuple(info) => json!({
+            "long_name": t.type_path(),
+            "type": "array",
+            "typeInfo": "Tuple",
+            "prefixItems": info
+                .iter()
+                .enumerate()
+                .map(|(idx, field)| add_min_max(json!({"type": typ(field.type_path())}), reg, idx, None))
+                .collect::<Vec<_>>(),
+            "items": false,
+        }),
+        TypeInfo::Value(info) => json!({
+            "long_name": t.type_path(),
+            "type": map_json_type(info.type_path()),
+            "typeInfo": "Value",
+        }),
+    };
+    schema.as_object_mut().unwrap().insert(
+        "isComponent".to_owned(),
+        reg.data::<ReflectComponent>().is_some().into(),
+    );
+    schema.as_object_mut().unwrap().insert(
+        "isResource".to_owned(),
+        reg.data::<ReflectResource>().is_some().into(),
+    );
+
+    schema
+        .as_object_mut()
+        .unwrap()
+        .insert("short_name".to_owned(), short_name.into());
+
+    (t.type_path().to_owned(), schema)
+}
+
+fn typ(t: &str) -> Value {
+    json!({ "$ref": format!("#/$defs/{t}") })
+}
+
+fn map_json_type(t: &str) -> Value {
+    match t {
+        "bool" => "boolean",
+        "u8" | "u16" | "u32" | "u64" | "u128" | "usize" => "uint",
+        "i8" | "i16" | "i32" | "i64" | "i128" | "isize" => "int",
+        "f32" | "f64" => "float",
+        "char" | "str" | "alloc::string::String" => "string",
+        _ => "object",
+    }
+    .into()
+}
+
+fn add_min_max(
+    mut val: Value,
+    reg: &TypeRegistration,
+    field_index: usize,
+    variant_index: Option<usize>,
+) -> Value {
+    #[cfg(feature = "support-inspector")]
+    fn get_min_max(
+        reg: &TypeRegistration,
+        field_index: usize,
+        variant_index: Option<usize>,
+    ) -> Option<(Option<f32>, Option<f32>)> {
+        use bevy_inspector_egui::inspector_options::{
+            std_options::NumberOptions, ReflectInspectorOptions, Target,
+        };
+
+        reg.data::<ReflectInspectorOptions>()
+            .and_then(|ReflectInspectorOptions(o)| {
+                o.get(if let Some(variant_index) = variant_index {
+                    Target::VariantField {
+                        variant_index,
+                        field_index,
+                    }
+                } else {
+                    Target::Field(field_index)
+                })
+            })
+            .and_then(|o| o.downcast_ref::<NumberOptions<f32>>())
+            .map(|num| (num.min, num.max))
+    }
+
+    #[cfg(not(feature = "support-inspector"))]
+    fn get_min_max(
+        _reg: &TypeRegistration,
+        _field_index: usize,
+        _variant_index: Option<usize>,
+    ) -> Option<(Option<f32>, Option<f32>)> {
+        None
+    }
+
+    let Some((min, max)) = get_min_max(reg, field_index, variant_index) else {
+        return val;
+    };
+    let obj = val.as_object_mut().unwrap();
+    if let Some(min) = min {
+        obj.insert("minimum".to_owned(), min.into());
+    }
+    if let Some(max) = max {
+        obj.insert("maximum".to_owned(), max.into());
+    }
+    val
+}

crates/blenvy/src/registry/mod.rs

@@ -0,0 +1,54 @@
+use std::path::PathBuf;
+
+pub mod export_types;
+pub use export_types::*;
+
+use bevy::{
+    app::Startup, asset::AssetPlugin, prelude::{App, Plugin, Resource}, scene::SceneFilter
+};
+
+pub struct ExportRegistryPlugin {
+    pub component_filter: SceneFilter,
+    pub resource_filter: SceneFilter,
+    pub save_path: PathBuf,
+}
+
+impl Default for ExportRegistryPlugin {
+    fn default() -> Self {
+        Self {
+            component_filter: SceneFilter::default(),
+            resource_filter: SceneFilter::default(),
+            save_path: PathBuf::from("registry.json"), // relative to assets folder
+        }
+    }
+}
+
+impl Plugin for ExportRegistryPlugin {
+    fn build(&self, app: &mut App) {
+        app.register_asset_root()
+            .add_systems(Startup, export_types);
+    }
+}
+
+trait RegistryExportApp {
+    fn register_asset_root(&mut self) -> &mut Self;
+}
+impl RegistryExportApp for App {
+    fn register_asset_root(&mut self) -> &mut Self {
+        let asset_plugin = get_asset_plugin(self);
+        let path_str = asset_plugin.file_path.clone();
+        let path = PathBuf::from(path_str);
+        self.insert_resource(AssetRoot(path))
+    }
+}
+
+fn get_asset_plugin(app: &App) -> &AssetPlugin {
+    let asset_plugins: Vec<&AssetPlugin> = app.get_added_plugins();
+    asset_plugins.into_iter().next().expect(ASSET_ERROR)
+}
+
+const ASSET_ERROR: &str = "Bevy_registry_export requires access to the Bevy asset plugin. \
+    Please add `ExportRegistryPlugin` after `AssetPlugin`, which is commonly added as part of the `DefaultPlugins`";
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash, Resource)]
+pub(crate) struct AssetRoot(pub(crate) PathBuf);

testing/bevy_example/Cargo.toml

@@ -6,8 +6,9 @@ license = "MIT OR Apache-2.0"
 
 [dependencies]
 bevy = { version = "0.14.0-rc.3", features = ["dynamic_linking"] }
-bevy_gltf_blueprints = { path = "../../crates/bevy_gltf_blueprints" }
-bevy_registry_export = { path = "../../crates/bevy_registry_export" }
+blenvy = { path = "../../crates/blenvy" }
+# bevy_gltf_blueprints = { path = "../../crates/bevy_gltf_blueprints" }
+# bevy_registry_export = { path = "../../crates/bevy_registry_export" }
 # bevy_gltf_worlflow_examples_common_rapier = { path = "../../examples/common_rapier" }
 #bevy_gltf_worlflow_examples_common = { path = "../../examples/common" }
 

testing/bevy_example/src/core/mod.rs

@@ -1,16 +1,29 @@
 use std::any::TypeId;
 
 use bevy::{prelude::*, utils::HashSet};
-use bevy_gltf_blueprints::*;
-use bevy_registry_export::*;
+use blenvy::*;
+
+/*use bevy_gltf_blueprints::*;
+use bevy_registry_export::*; */
 
 use crate::{ComponentAToFilterOut, ComponentBToFilterOut};
 
 pub struct CorePlugin;
 impl Plugin for CorePlugin {
     fn build(&self, app: &mut App) {
-        app.add_plugins((
-            ExportRegistryPlugin {
+        app.add_plugins(
+            BlenvyPlugin {
+                aabbs: true,
+                registry_component_filter: SceneFilter::Denylist(HashSet::from([
+                    // this is using Bevy's build in SceneFilter, you can compose what components you want to allow/deny
+                    TypeId::of::<ComponentAToFilterOut>(),
+                    TypeId::of::<ComponentBToFilterOut>(),
+                    // and any other commponent you want to include/exclude
+                ])),
+                ..Default::default()
+            }
+            
+            /* ExportRegistryPlugin {
                 component_filter: SceneFilter::Denylist(HashSet::from([
                     // this is using Bevy's build in SceneFilter, you can compose what components you want to allow/deny
                     TypeId::of::<ComponentAToFilterOut>(),
@@ -23,7 +36,7 @@ impl Plugin for CorePlugin {
                 material_library: true,
                 aabbs: true,
                 ..Default::default()
-            },
-        ));
+            }, */
+        );
     }
 }

testing/bevy_example/src/game/animation.rs

@@ -1,12 +1,17 @@
 use std::time::Duration;
 
-use bevy_gltf_blueprints::{
+/*use bevy_gltf_blueprints::{
+    AnimationInfos, AnimationMarkerReached, BlueprintAnimationPlayerLink, BlueprintAnimations,
+    SceneAnimationPlayerLink, SceneAnimations,
+};*/
+
+use bevy::{gltf::Gltf, prelude::*};
+
+use blenvy::{
     AnimationInfos, AnimationMarkerReached, BlueprintAnimationPlayerLink, BlueprintAnimations,
     SceneAnimationPlayerLink, SceneAnimations,
 };
 
-use bevy::{gltf::Gltf, prelude::*};
-
 #[derive(Component, Reflect, Default, Debug)]
 #[reflect(Component)]
 /// flag component for testing

testing/bevy_example/src/game/in_game.rs

@@ -1,5 +1,6 @@
 use bevy::prelude::*;
-use bevy_gltf_blueprints::{BluePrintBundle, BlueprintName, BlueprintPath, GameWorldTag};
+// use bevy_gltf_blueprints::{BluePrintBundle, BlueprintName, BlueprintPath, GameWorldTag};
+use blenvy::{BluePrintBundle, BlueprintName, BlueprintPath, GameWorldTag, SpawnHere};
 use crate::{GameState, InAppRunning};
 
 //use bevy_rapier3d::prelude::Velocity;
@@ -25,6 +26,7 @@ pub fn setup_game(
         BlueprintName("World".into()),
         BlueprintPath("levels/World.glb".into()),
         bevy::prelude::Name::from("world"),
+        SpawnHere,
         GameWorldTag,
         InAppRunning,
     ));

testing/bevy_example/src/game/mod.rs

@@ -6,8 +6,8 @@ pub use animation::*;
 
 use std::{collections::HashMap, fs, time::Duration};
 
-use bevy_gltf_blueprints::{
-    AllAssets, BlueprintAnimationPlayerLink, BlueprintName, GltfBlueprintsSet, SceneAnimations
+use blenvy::{
+    AllAssets, BlueprintAnimationPlayerLink, BlueprintEvent, BlueprintName, GltfBlueprintsSet, SceneAnimations
 };
 
 use bevy::{
@@ -127,6 +127,15 @@ fn exit_game(mut app_exit_events: ResMut<Events<bevy::app::AppExit>>) {
     app_exit_events.send(bevy::app::AppExit::Success);
 }
 
+fn check_for_gltf_events(
+    mut blueprint_events: EventReader<BlueprintEvent>,
+)
+{
+    for event in blueprint_events.read() {
+        info!("BLUEPRINT EVENT: {:?}", event);
+    }
+}
+
 pub struct GamePlugin;
 impl Plugin for GamePlugin {
     fn build(&self, app: &mut App) {
@@ -136,7 +145,7 @@ impl Plugin for GamePlugin {
             .register_type::<MarkerFox>()
 
             .add_systems(Update, (spawn_test).run_if(in_state(GameState::InGame)))
-            .add_systems(Update, validate_export)
+            .add_systems(Update, (validate_export, check_for_gltf_events))
             //.add_systems(OnEnter(AppState::CoreLoading), start_game)
 
             .add_systems(OnEnter(AppState::MenuRunning), start_game)

testing/bevy_example/src/hierarchy_debug.rs

@@ -1,5 +1,5 @@
 use bevy::{gltf::{GltfMaterialExtras, GltfMeshExtras, GltfSceneExtras}, prelude::*};
-use bevy_gltf_blueprints::{AllAssets, BlueprintInstanceReady};
+use blenvy::{AllAssets, BlueprintInstanceReady};
 
 use crate::BasicTest;
 
@@ -140,7 +140,7 @@ impl Plugin for HiearchyDebugPlugin {
             .add_systems(Startup, setup_hierarchy_debug)
             .add_systems(Update, draw_hierarchy_debug)
             //.add_systems(Update, check_for_gltf_extras)
-
+            
            ;
     }
 }

tools/blenvy/TODO.md

@@ -160,12 +160,13 @@ General issues:
 - [ ] find a solution for the new color handling 
 - [ ] add back lighting_components
 - [ ] check if scene components are being deleted through our scene re-orgs in the spawn post process
-
+- [x] trigger events when assets are loaded, blueprints are spawned & co
+- [ ] should "blueprint spawned" only be triggered after all its sub blueprints have spawned ? 
 
 - [ ] 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
-
+- [ ] do a deprecation release of all bevy_gltf_xxx crates to point at the new Blenvy crate
 
 - [ ] simplify examples:
     - [ ] a full fledged demo (including physics & co)