Merge e464c49592 into d5f14bc037

crates/blenvy/src/components/fake_entity.rs

@@ -0,0 +1,272 @@
+use std::{alloc::Layout, cell::Cell, num::NonZeroU32};
+
+use bevy::{
+    core::Name,
+    ecs::system::SystemParam,
+    gltf::GltfExtras,
+    log::{info, warn},
+    prelude::{HierarchyQueryExt, Parent, Query, With},
+    reflect::ReflectDeserialize,
+    scene::{InstanceId, SceneInstance},
+};
+use serde::Deserialize;
+
+#[derive(SystemParam)]
+pub(crate) struct BadWorldAccess<'w, 's> {
+    pub(crate) names: Query<'w, 's, (bevy::ecs::entity::Entity, &'static Name), With<GltfExtras>>,
+    pub(crate) hierarchy: Query<'w, 's, &'static Parent, ()>,
+    pub(crate) scene_instances: Query<'w, 's, &'static SceneInstance, ()>,
+}
+
+thread_local! {
+    pub(crate) static BAD_WORLD_ACCESS: Cell<Option<BadWorldAccess<'static, 'static>>> = Cell::new(None);
+    pub(crate) static INSTANCE_ID: Cell<Option<InstanceId>> = Cell::new(None);
+}
+
+const _: () = {
+    let real = Layout::new::<bevy::ecs::entity::Entity>();
+    let fake = Layout::new::<Entity>();
+    assert!(real.size() == fake.size());
+    assert!(real.align() == fake.align());
+};
+
+#[derive(Clone)]
+#[repr(C, align(8))]
+pub(crate) struct Entity {
+    // Do not reorder the fields here. The ordering is equivalent to bevy's `Entity`
+    #[cfg(target_endian = "little")]
+    index: u32,
+    generation: NonZeroU32,
+    #[cfg(target_endian = "big")]
+    index: u32,
+}
+
+impl<'de> Deserialize<'de> for Entity {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        #[derive(Deserialize)]
+        #[serde(rename = "Entity")]
+        struct EntityData {
+            name: Option<String>,
+        }
+
+        let entity_data = EntityData::deserialize(deserializer)?;
+
+        let entity = if let Some(name) = entity_data.name {
+            info!("Found name {name}");
+            let BadWorldAccess {
+                names,
+                hierarchy,
+                scene_instances,
+            } = BAD_WORLD_ACCESS.take().expect("No bad world access :c");
+            let instance = INSTANCE_ID.get().expect("No instance id set :c");
+
+            let mut target = None;
+            'search: for (e, n) in names.iter() {
+                if !name.eq(n.as_str()) {
+                    continue;
+                }
+
+                for parent in hierarchy.iter_ancestors(e) {
+                    let Ok(id) = scene_instances.get(parent) else {
+                        continue;
+                    };
+                    if instance.eq(id) {
+                        target = Some(e);
+                        break 'search;
+                    }
+                }
+            }
+
+            BAD_WORLD_ACCESS.set(Some(BadWorldAccess {
+                names,
+                hierarchy,
+                scene_instances,
+            }));
+
+            target.unwrap_or_else(|| {
+                warn!("No entity found for '{name}' - perhaps it doesn't contain any components from blender?");
+                bevy::ecs::entity::Entity::PLACEHOLDER
+            })
+        } else {
+            warn!("No object was specified for Entity relation, using `Entity::PLACEHOLDER`.");
+            bevy::ecs::entity::Entity::PLACEHOLDER
+        };
+
+        Ok(unsafe {
+            // SAFETY: both have the same layout
+            core::mem::transmute(entity)
+        })
+    }
+}
+
+// This is expanded and modified from
+// ```
+// #[derive(Clone, Reflect)]
+// #[reflect_value(Deserialize)]
+// ```
+const _: () = {
+    use bevy::reflect as bevy_reflect;
+
+    #[allow(unused_mut)]
+    impl bevy_reflect::GetTypeRegistration for Entity
+    where
+        Self: ::core::any::Any + ::core::marker::Send + ::core::marker::Sync,
+    {
+        fn get_type_registration() -> bevy_reflect::TypeRegistration {
+            let mut registration = bevy_reflect::TypeRegistration::of::<Self>();
+            registration
+                .insert::<
+                    bevy_reflect::ReflectFromPtr,
+                >(bevy_reflect::FromType::<Self>::from_type());
+            registration.insert::<bevy_reflect::ReflectFromReflect>(
+                bevy_reflect::FromType::<Self>::from_type(),
+            );
+            registration.insert::<ReflectDeserialize>(bevy_reflect::FromType::<Self>::from_type());
+            registration
+        }
+    }
+    impl bevy_reflect::TypePath for Entity
+    where
+        Self: ::core::any::Any + ::core::marker::Send + ::core::marker::Sync,
+    {
+        fn type_path() -> &'static str {
+            "bevy_ecs::entity::Entity" // this is changed
+        }
+        fn short_type_path() -> &'static str {
+            "Entity"
+        }
+        fn type_ident() -> Option<&'static str> {
+            ::core::option::Option::Some("Entity")
+        }
+        fn crate_name() -> Option<&'static str> {
+            // this is changed
+            ::core::option::Option::Some("bevy_ecs::entity".split(':').next().unwrap())
+        }
+        fn module_path() -> Option<&'static str> {
+            ::core::option::Option::Some("bevy_ecs::entity") // this is changed
+        }
+    }
+    impl bevy_reflect::Typed for Entity
+    where
+        Self: ::core::any::Any + ::core::marker::Send + ::core::marker::Sync,
+    {
+        fn type_info() -> &'static bevy_reflect::TypeInfo {
+            static CELL: bevy_reflect::utility::NonGenericTypeInfoCell =
+                bevy_reflect::utility::NonGenericTypeInfoCell::new();
+            CELL.get_or_set(|| {
+                let info = bevy_reflect::ValueInfo::new::<bevy::ecs::entity::Entity>(); // this is changed
+                bevy_reflect::TypeInfo::Value(info)
+            })
+        }
+    }
+    impl bevy_reflect::Reflect for Entity
+    where
+        Self: ::core::any::Any + ::core::marker::Send + ::core::marker::Sync,
+    {
+        #[inline]
+        fn get_represented_type_info(
+            &self,
+        ) -> ::core::option::Option<&'static bevy_reflect::TypeInfo> {
+            ::core::option::Option::Some(<Self as bevy_reflect::Typed>::type_info())
+        }
+        #[inline]
+        fn into_any(self: ::std::boxed::Box<Self>) -> ::std::boxed::Box<dyn ::core::any::Any> {
+            // this is changed
+            unsafe {
+                core::mem::transmute::<
+                    ::std::boxed::Box<Entity>,
+                    ::std::boxed::Box<bevy::ecs::entity::Entity>,
+                >(self)
+            }
+        }
+        #[inline]
+        fn as_any(&self) -> &dyn ::core::any::Any {
+            // this is changed
+            unsafe { core::mem::transmute::<&Entity, &bevy::ecs::entity::Entity>(self) }
+        }
+        #[inline]
+        fn as_any_mut(&mut self) -> &mut dyn ::core::any::Any {
+            // this is changed
+            unsafe { core::mem::transmute::<&mut Entity, &mut bevy::ecs::entity::Entity>(self) }
+        }
+        #[inline]
+        fn into_reflect(
+            self: ::std::boxed::Box<Self>,
+        ) -> ::std::boxed::Box<dyn bevy_reflect::Reflect> {
+            self
+        }
+        #[inline]
+        fn as_reflect(&self) -> &dyn bevy_reflect::Reflect {
+            self
+        }
+        #[inline]
+        fn as_reflect_mut(&mut self) -> &mut dyn bevy_reflect::Reflect {
+            self
+        }
+        #[inline]
+        fn clone_value(&self) -> ::std::boxed::Box<dyn bevy_reflect::Reflect> {
+            ::std::boxed::Box::new(::core::clone::Clone::clone(self))
+        }
+        #[inline]
+        fn try_apply(
+            &mut self,
+            value: &dyn bevy_reflect::Reflect,
+        ) -> ::core::result::Result<(), bevy_reflect::ApplyError> {
+            let any = bevy_reflect::Reflect::as_any(value);
+            if let ::core::option::Option::Some(value) =
+                <dyn ::core::any::Any>::downcast_ref::<Self>(any)
+            {
+                *self = ::core::clone::Clone::clone(value);
+            } else {
+                return ::core::result::Result::Err(bevy_reflect::ApplyError::MismatchedTypes {
+                    from_type: ::core::convert::Into::into(
+                        bevy_reflect::DynamicTypePath::reflect_type_path(value),
+                    ),
+                    to_type: ::core::convert::Into::into(
+                        <Self as bevy_reflect::TypePath>::type_path(),
+                    ),
+                });
+            }
+            ::core::result::Result::Ok(())
+        }
+        #[inline]
+        fn set(
+            &mut self,
+            value: ::std::boxed::Box<dyn bevy_reflect::Reflect>,
+        ) -> ::core::result::Result<(), ::std::boxed::Box<dyn bevy_reflect::Reflect>> {
+            *self = <dyn bevy_reflect::Reflect>::take(value)?;
+            ::core::result::Result::Ok(())
+        }
+        #[inline]
+        fn reflect_kind(&self) -> bevy_reflect::ReflectKind {
+            bevy_reflect::ReflectKind::Value
+        }
+        #[inline]
+        fn reflect_ref(&self) -> bevy_reflect::ReflectRef {
+            bevy_reflect::ReflectRef::Value(self)
+        }
+        #[inline]
+        fn reflect_mut(&mut self) -> bevy_reflect::ReflectMut {
+            bevy_reflect::ReflectMut::Value(self)
+        }
+        #[inline]
+        fn reflect_owned(self: ::std::boxed::Box<Self>) -> bevy_reflect::ReflectOwned {
+            bevy_reflect::ReflectOwned::Value(self)
+        }
+    }
+    impl bevy_reflect::FromReflect for Entity
+    where
+        Self: ::core::any::Any + ::core::marker::Send + ::core::marker::Sync,
+    {
+        fn from_reflect(reflect: &dyn bevy_reflect::Reflect) -> ::core::option::Option<Self> {
+            ::core::option::Option::Some(::core::clone::Clone::clone(
+                <dyn ::core::any::Any>::downcast_ref::<Entity>(
+                    <dyn bevy_reflect::Reflect>::as_any(reflect),
+                )?,
+            ))
+        }
+    }
+};

crates/blenvy/src/components/mod.rs

@@ -7,6 +7,8 @@ pub use ronstring_to_reflect_component::*;
 pub mod process_gltfs;
 pub use process_gltfs::*;
 
+mod fake_entity;
+
 pub mod blender_settings;
 
 use bevy::{

crates/blenvy/src/components/process_gltfs.rs

@@ -1,20 +1,27 @@
+use std::ops::Deref;
+
 use bevy::{
     core::Name,
     ecs::{
         entity::Entity,
         query::{Added, Without},
         reflect::{AppTypeRegistry, ReflectComponent},
+        system::{SystemParam, SystemState},
         world::World,
     },
     gltf::{GltfExtras, GltfMaterialExtras, GltfMeshExtras, GltfSceneExtras},
     hierarchy::Parent,
     log::{debug, warn},
+    prelude::{HierarchyQueryExt, Local, Query, Res},
     reflect::{Reflect, TypeRegistration},
+    scene::SceneInstance,
     utils::HashMap,
 };
 
 use crate::{ronstring_to_reflect_component, GltfProcessed};
 
+use super::fake_entity::{self, BadWorldAccess};
+
 // , mut entity_components: HashMap<Entity, Vec<(Box<dyn Reflect>, TypeRegistration)>>
 fn find_entity_components(
     entity: Entity,
@@ -55,79 +62,172 @@ fn find_entity_components(
     (target_entity, reflect_components)
 }
 
+#[derive(SystemParam)]
+#[doc(hidden)]
+pub struct ExtrasComponentQueries<'w, 's> {
+    extras: Query<
+        'w,
+        's,
+        (Entity, Option<&'static Name>, &'static GltfExtras),
+        (Added<GltfExtras>, Without<GltfProcessed>),
+    >,
+    scene_extras: Query<
+        'w,
+        's,
+        (Entity, Option<&'static Name>, &'static GltfSceneExtras),
+        (Added<GltfSceneExtras>, Without<GltfProcessed>),
+    >,
+    mesh_extras: Query<
+        'w,
+        's,
+        (Entity, Option<&'static Name>, &'static GltfMeshExtras),
+        (Added<GltfMeshExtras>, Without<GltfProcessed>),
+    >,
+    material_extras: Query<
+        'w,
+        's,
+        (Entity, Option<&'static Name>, &'static GltfMaterialExtras),
+        (Added<GltfMaterialExtras>, Without<GltfProcessed>),
+    >,
+    // Hierarchy and Scene instances are both here and in BadWorldAccess, but they don't clash because read-only.
+    bad_world_access: BadWorldAccess<'w, 's>,
+    hierarchy: Query<'w, 's, &'static Parent>,
+    scene_instances: Query<'w, 's, &'static SceneInstance>,
+    type_registry: Res<'w, AppTypeRegistry>,
+}
+
 /// main function: injects components into each entity in gltf files that have `gltf_extras`, using reflection
-pub fn add_components_from_gltf_extras(world: &mut World) {
-    let mut extras = world.query_filtered::<(Entity, Option<&Name>, &GltfExtras, Option<&Parent>), (Added<GltfExtras>, Without<GltfProcessed>)>();
-    let mut scene_extras = world.query_filtered::<(Entity, Option<&Name>, &GltfSceneExtras, Option<&Parent>), (Added<GltfSceneExtras>, Without<GltfProcessed>)>();
-    let mut mesh_extras = world.query_filtered::<(Entity, Option<&Name>, &GltfMeshExtras, Option<&Parent>), (Added<GltfMeshExtras>, Without<GltfProcessed>)>();
-    let mut material_extras = world.query_filtered::<(Entity, Option<&Name>, &GltfMaterialExtras, Option<&Parent>), (Added<GltfMaterialExtras>, Without<GltfProcessed>)>();
+pub fn add_components_from_gltf_extras(
+    world: &mut World,
+    mut queries_state: Local<Option<SystemState<ExtrasComponentQueries<'_, '_>>>>,
+) {
+    let state = queries_state.get_or_insert_with(|| SystemState::new(world));
+    let ExtrasComponentQueries {
+        extras,
+        scene_extras,
+        mesh_extras,
+        material_extras,
+        bad_world_access,
+        hierarchy,
+        scene_instances,
+        type_registry,
+    } = state.get_mut(world);
 
     let mut entity_components: HashMap<Entity, Vec<(Box<dyn Reflect>, TypeRegistration)>> =
         HashMap::new();
 
     // let gltf_components_config = world.resource::<GltfComponentsConfig>();
 
-    for (entity, name, extra, parent) in extras.iter(world) {
+    unsafe {
+        // SAFETY: we set this to `None` again before using world again and fake_entity just uses it in that time.
+        fake_entity::BAD_WORLD_ACCESS.set(Some(core::mem::transmute(bad_world_access)));
+    }
+
+    for (entity, name, extra) in extras.iter() {
+        let parent = hierarchy.get(entity).ok();
         debug!(
             "Gltf Extra: Name: {:?}, entity {:?}, parent: {:?}, 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);
+        if let Some(instance) = hierarchy
+            .iter_ancestors(entity)
+            .find_map(|p| scene_instances.get(p).ok())
+        {
+            fake_entity::INSTANCE_ID.set(Some(*instance.deref()));
+        } else {
+            warn!("Can't find higher-hierarchy `SceneInstance` for entity '{name:?}'");
+            fake_entity::INSTANCE_ID.set(None);
+        };
+
+        let mut type_registry = type_registry.write();
+        let reflect_components = ronstring_to_reflect_component(&extra.value, &mut type_registry);
         // let name = name.unwrap_or(&Name::new(""));
 
         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) {
+    for (entity, name, extra) in scene_extras.iter() {
+        let parent = hierarchy.get(entity).ok();
         debug!(
             "Gltf Scene Extra: 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);
+        if let Some(instance) = hierarchy
+            .iter_ancestors(entity)
+            .find_map(|p| scene_instances.get(p).ok())
+        {
+            fake_entity::INSTANCE_ID.set(Some(*instance.deref()));
+        } else {
+            warn!("Can't find higher-hierarchy `SceneInstance` for entity '{name:?}'");
+            fake_entity::INSTANCE_ID.set(None);
+        };
+
+        let mut type_registry = type_registry.write();
+        let reflect_components = ronstring_to_reflect_component(&extra.value, &mut 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) {
+    for (entity, name, extra) in mesh_extras.iter() {
+        let parent = hierarchy.get(entity).ok();
         debug!(
             "Gltf Mesh Extra: 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);
+        if let Some(instance) = hierarchy
+            .iter_ancestors(entity)
+            .find_map(|p| scene_instances.get(p).ok())
+        {
+            fake_entity::INSTANCE_ID.set(Some(*instance.deref()));
+        } else {
+            warn!("Can't find higher-hierarchy `SceneInstance` for entity '{name:?}'");
+            fake_entity::INSTANCE_ID.set(None);
+        };
+
+        let mut type_registry = type_registry.write();
+        let reflect_components = ronstring_to_reflect_component(&extra.value, &mut 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) {
+    for (entity, name, extra) in material_extras.iter() {
+        let parent = hierarchy.get(entity).ok();
         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);
+        if let Some(instance) = hierarchy
+            .iter_ancestors(entity)
+            .find_map(|p| scene_instances.get(p).ok())
+        {
+            fake_entity::INSTANCE_ID.set(Some(*instance.deref()));
+        } else {
+            warn!("Can't find higher-hierarchy `SceneInstance` for entity '{name:?}'");
+            fake_entity::INSTANCE_ID.set(None);
+        };
+
+        let mut type_registry = type_registry.write();
+        let reflect_components = ronstring_to_reflect_component(&extra.value, &mut type_registry);
 
         let (target_entity, updated_components) =
             find_entity_components(entity, name, parent, reflect_components, &entity_components);
         entity_components.insert(target_entity, updated_components);
     }
 
+    fake_entity::BAD_WORLD_ACCESS.set(None);
+    fake_entity::INSTANCE_ID.set(None);
+
     for (entity, components) in entity_components {
         let type_registry: &AppTypeRegistry = world.resource();
         let type_registry = type_registry.clone();

crates/blenvy/src/components/ronstring_to_reflect_component.rs

@@ -1,15 +1,17 @@
+use std::any::TypeId;
+
 use bevy::log::{debug, warn};
 use bevy::reflect::serde::ReflectDeserializer;
-use bevy::reflect::{Reflect, TypeRegistration, TypeRegistry};
+use bevy::reflect::{GetTypeRegistration, Reflect, TypeRegistration, TypeRegistry};
 use bevy::utils::HashMap;
 use ron::Value;
 use serde::de::DeserializeSeed;
 
-use super::capitalize_first_letter;
+use super::{capitalize_first_letter, fake_entity};
 
 pub fn ronstring_to_reflect_component(
     ron_string: &str,
-    type_registry: &TypeRegistry,
+    type_registry: &mut TypeRegistry,
 ) -> Vec<(Box<dyn Reflect>, TypeRegistration)> {
     let lookup: HashMap<String, Value> = ron::from_str(ron_string).unwrap();
     let mut components: Vec<(Box<dyn Reflect>, TypeRegistration)> = Vec::new();
@@ -96,10 +98,16 @@ fn components_string_to_components(
 
 fn bevy_components_string_to_components(
     parsed_value: String,
-    type_registry: &TypeRegistry,
+    type_registry: &mut TypeRegistry,
     components: &mut Vec<(Box<dyn Reflect>, TypeRegistration)>,
 ) {
     let lookup: HashMap<String, Value> = ron::from_str(&parsed_value).unwrap();
+
+    let recovery_entity_type = type_registry
+        .get(TypeId::of::<bevy::ecs::entity::Entity>())
+        .cloned();
+    type_registry.overwrite_registration(fake_entity::Entity::get_type_registration());
+
     for (key, value) in lookup.into_iter() {
         let parsed_value: String = match value.clone() {
             Value::String(str) => str,
@@ -121,10 +129,10 @@ fn bevy_components_string_to_components(
             let reflect_deserializer = ReflectDeserializer::new(type_registry);
             let component = reflect_deserializer
                 .deserialize(&mut deserializer)
-                .unwrap_or_else(|_| {
+                .unwrap_or_else(|e| {
                     panic!(
-                        "failed to deserialize component {} with value: {:?}",
-                        key, value
+                        "failed to deserialize component '{}' with value '{:?}': {:?}",
+                        key, value, e
                     )
                 });
 
@@ -136,4 +144,10 @@ fn bevy_components_string_to_components(
             warn!("no type registration for {}", key);
         }
     }
+
+    if let Some(original_entity) = recovery_entity_type {
+        type_registry.overwrite_registration(original_entity);
+    } else {
+        warn!("There isn't an original type registration for `bevy_ecs::entity::Entity` but it was overwriten. Stuff may break and/or panic. Make sure that you register it!");
+    }
 }

examples/relations/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "blenvy_relations_example"
+version = "0.0.1"
+edition = "2021"
+license = "MIT OR Apache-2.0"
+
+[dependencies]
+bevy = { version = "0.14", features = ["dynamic_linking"] }
+bevy-inspector-egui = "0.25.2"
+blenvy = { path = "../../crates/blenvy" }

examples/relations/README.md

@@ -0,0 +1,41 @@
+# Basic relations example/demo
+
+This example showcases how to refer to another `Entity` inside Bevy components added to objects/ blueprints/ meshes and materials extracted from the gltf files
+
+## Running this example
+
+```
+cargo run --features bevy/dynamic_linking
+
+```
+
+## Wasm instructions
+
+### Setup
+
+as per the bevy documentation:
+
+```shell
+rustup target add wasm32-unknown-unknown
+cargo install wasm-bindgen-cli
+```
+
+### Building this example
+
+navigate to the current folder , and then
+
+```shell
+cargo build --release --target wasm32-unknown-unknown --target-dir ./target
+wasm-bindgen --out-name wasm_example \
+  --out-dir ./target/wasm \
+  --target web target/wasm32-unknown-unknown/release/bevy_gltf_blueprints_basic_wasm_example.wasm
+
+```
+
+### Running this example
+
+run a web server in the current folder, and navigate to the page, you should see the example in your browser
+
+## Additional notes
+
+- You usually define either the Components directly or use `Proxy components` that get replaced in Bevy systems with the actual Components that you want (usually when for some reason, ie external crates with unregistered components etc) you cannot use the components directly.

examples/relations/assets/levels/World.meta.ron

@@ -0,0 +1,5 @@
+(
+  assets:
+   [ 
+   ]
+)

examples/relations/src/main.rs

@@ -0,0 +1,50 @@
+use bevy::prelude::*;
+use bevy_inspector_egui::quick::WorldInspectorPlugin;
+use blenvy::{BlenvyPlugin, BlueprintInfo, GameWorldTag, HideUntilReady, SpawnBlueprint};
+
+#[derive(Component, Reflect, Debug)]
+#[reflect(Component)]
+pub struct TupleRelations(Entity);
+
+#[derive(Component, Reflect)]
+#[reflect(Component)]
+pub struct BigRelations {
+    main: Entity,
+    other: Vec<Entity>,
+}
+
+fn main() {
+    App::new()
+        .add_plugins((
+            DefaultPlugins.set(AssetPlugin::default()),
+            BlenvyPlugin::default(),
+            WorldInspectorPlugin::new(),
+        ))
+        .register_type::<TupleRelations>()
+        .register_type::<BigRelations>()
+        .add_systems(Startup, setup_game)
+        .add_systems(Update, (print_names, print_tuple_relations))
+        .run();
+}
+
+fn setup_game(mut commands: Commands) {
+    // here we actually spawn our game world/level
+    commands.spawn((
+        BlueprintInfo::from_path("levels/World.glb"), // all we need is a Blueprint info...
+        SpawnBlueprint, // and spawnblueprint to tell blenvy to spawn the blueprint now
+        HideUntilReady, // only reveal the level once it is ready
+        GameWorldTag,
+    ));
+}
+
+fn print_names(query: Query<(Entity, &Name), Added<Name>>) {
+    for (entity, name) in &query {
+        info!("[EXAMPLE] {name} is {entity}");
+    }
+}
+
+fn print_tuple_relations(query: Query<(&Name, &TupleRelations), Added<TupleRelations>>) {
+    for (name, r) in &query {
+        info!("[EXAMPLE] {name} has the relation {r:?}")
+    }
+}

tools/blenvy/add_ons/bevy_components/propGroups/conversions_from_prop_group.py

@@ -25,6 +25,8 @@ conversion_tables = {
     "bevy_color::srgba::Srgba":  lambda value: "Srgba(red:"+str(value[0])+ ", green:"+str(value[1])+ ", blue:"+str(value[2])+ ", alpha:"+str(value[3])+   ")",
     "bevy_color::linear_rgba::LinearRgba":  lambda value: "LinearRgba(red:"+str(value[0])+ ", green:"+str(value[1])+ ", blue:"+str(value[2])+ ", alpha:"+str(value[3])+   ")",
     "bevy_color::hsva::Hsva":  lambda value: "Hsva(hue:"+str(value[0])+ ", saturation:"+str(value[1])+ ", value:"+str(value[2])+ ", alpha:"+str(value[3])+   ")",
+
+    "bevy_ecs::entity::Entity": lambda value: 'Entity(name: ' + (('Some("' + str(value.name) + '")') if value is not None else "None") + ')',
 }
 
 #converts the value of a property group(no matter its complexity) into a single custom property value

tools/blenvy/add_ons/bevy_components/propGroups/conversions_to_prop_group.py

@@ -1,3 +1,4 @@
+import bpy
 from bpy_types import PropertyGroup
 import re
 
@@ -126,6 +127,16 @@ def parse_color_hsva(value, caster, typeName):
     parsed = parse_struct_string(value.replace(typeName,"").replace("(", "").replace(")","") )
     return [caster(parsed['hue']), caster(parsed['saturation']), caster(parsed['value']), caster(parsed['alpha'])]
 
+def parse_entity(value):
+    # strip 'Entity(name: <VAL>)' to just '<VAL>'
+    value = value[13:-1]
+    if value.startswith("Some"):
+        # strip 'Some("<VAL>")' to just '<VAL>'
+        value = value[6:-2]
+        return bpy.context.scene.objects[value]
+    else:
+        return None
+
 def to_int(input):
     return int(float(input))
 
@@ -171,7 +182,7 @@ type_mappings = {
     "bevy_color::linear_rgba::LinearRgba":  lambda value: parse_color_rgba(value, float, "LinearRgba"),
     "bevy_color::hsva::Hsva":  lambda value: parse_color_hsva(value, float, "Hsva"),
 
-    'bevy_ecs::entity::Entity': lambda value: int(value),
+    "bevy_ecs::entity::Entity": parse_entity,
 }
 
 def is_def_value_type(definition, registry):

tools/blenvy/add_ons/bevy_components/propGroups/process_list.py

@@ -3,6 +3,7 @@ from .utils import generate_wrapper_propertyGroup
 from . import process_component
 
 def process_list(registry, definition, update, nesting_long_names=[]):
+    blender_property_mapping = registry.blender_property_mapping
     value_types_defaults = registry.value_types_defaults 
     type_infos = registry.type_infos
 
@@ -13,7 +14,7 @@ def process_list(registry, definition, update, nesting_long_names=[]):
     
     item_definition = type_infos[ref_name]
     item_long_name = item_definition["long_name"]
-    is_item_value_type = item_long_name in value_types_defaults
+    is_item_value_type = item_long_name in blender_property_mapping
 
     property_group_class = None
     #if the content of the list is a unit type, we need to generate a fake wrapper, otherwise we cannot use layout.prop(group, "propertyName") as there is no propertyName !

tools/blenvy/add_ons/bevy_components/propGroups/process_map.py

@@ -3,6 +3,7 @@ from .utils import generate_wrapper_propertyGroup
 from . import process_component
 
 def process_map(registry, definition, update, nesting_long_names=[]):
+    blender_property_mapping = registry.blender_property_mapping
     value_types_defaults = registry.value_types_defaults 
     type_infos = registry.type_infos
 
@@ -19,7 +20,7 @@ def process_map(registry, definition, update, nesting_long_names=[]):
     if key_ref_name in type_infos:
         key_definition = type_infos[key_ref_name]
         original_long_name = key_definition["long_name"]
-        is_key_value_type = original_long_name in value_types_defaults
+        is_key_value_type = original_long_name in blender_property_mapping
         definition_link = definition["keyType"]["type"]["$ref"]
 
         #if the content of the list is a unit type, we need to generate a fake wrapper, otherwise we cannot use layout.prop(group, "propertyName") as there is no propertyName !
@@ -38,7 +39,7 @@ def process_map(registry, definition, update, nesting_long_names=[]):
     if value_ref_name in type_infos:
         value_definition = type_infos[value_ref_name]
         original_long_name = value_definition["long_name"]
-        is_value_value_type = original_long_name in value_types_defaults
+        is_value_value_type = original_long_name in blender_property_mapping
         definition_link = definition["valueType"]["type"]["$ref"]
 
         #if the content of the list is a unit type, we need to generate a fake wrapper, otherwise we cannot use layout.prop(group, "propertyName") as there is no propertyName !

tools/blenvy/add_ons/bevy_components/propGroups/process_structs.py

@@ -17,12 +17,15 @@ def process_structs(registry, definition, properties, update, nesting_long_names
         if ref_name in type_infos:
             original = type_infos[ref_name]
             original_long_name = original["long_name"]
-            is_value_type = original_long_name in value_types_defaults
-            value = value_types_defaults[original_long_name] if is_value_type else None
+
+            is_value_type = original_long_name in blender_property_mapping
+            has_default_value = original_long_name in value_types_defaults
+            
+            value = value_types_defaults[original_long_name] if has_default_value else None
             default_values[property_name] = value
 
             if is_value_type:
-                if original_long_name in blender_property_mapping:
+                if has_default_value:
                     blender_property_def = blender_property_mapping[original_long_name]
                     blender_property = blender_property_def["type"](
                         **blender_property_def["presets"],# we inject presets first
@@ -31,6 +34,14 @@ def process_structs(registry, definition, properties, update, nesting_long_names
                         update = update
                     )
                     __annotations__[property_name] = blender_property
+                else:
+                    blender_property_def = blender_property_mapping[original_long_name]
+                    blender_property = blender_property_def["type"](
+                        **blender_property_def["presets"],# we inject presets first
+                        name = property_name,
+                        update = update
+                    )
+                    __annotations__[property_name] = blender_property
             else:
                 original_long_name = original["long_name"]
                 (sub_component_group, _) = process_component.process_component(registry, original, update, {"nested": True, "long_name": original_long_name}, nesting_long_names+[property_name])

tools/blenvy/add_ons/bevy_components/propGroups/process_tupples.py

@@ -20,14 +20,16 @@ def process_tupples(registry, definition, prefixItems, update, nesting_long_name
         if ref_name in type_infos:
             original = type_infos[ref_name]
             original_long_name = original["long_name"]
-            is_value_type = original_long_name in value_types_defaults
 
-            value = value_types_defaults[original_long_name] if is_value_type else None
+            is_value_type = original_long_name in blender_property_mapping
+            has_default_value = original_long_name in value_types_defaults
+
+            value = value_types_defaults[original_long_name] if has_default_value else None
             default_values.append(value)
             prefix_infos.append(original)
 
             if is_value_type:
-                if original_long_name in blender_property_mapping:
+                if has_default_value:
                     blender_property_def = blender_property_mapping[original_long_name]
                     blender_property = blender_property_def["type"](
                         **blender_property_def["presets"],# we inject presets first
@@ -36,6 +38,15 @@ def process_tupples(registry, definition, prefixItems, update, nesting_long_name
                         update= update
                     )
                   
+                    __annotations__[property_name] = blender_property
+                else:
+                    blender_property_def = blender_property_mapping[original_long_name]
+                    blender_property = blender_property_def["type"](
+                        **blender_property_def["presets"],# we inject presets first
+                        name = property_name,
+                        update= update
+                    )
+                  
                     __annotations__[property_name] = blender_property
             else:
                 original_long_name = original["long_name"]

tools/blenvy/add_ons/bevy_components/propGroups/utils.py

@@ -11,7 +11,9 @@ from bpy_types import PropertyGroup
 def generate_wrapper_propertyGroup(wrapped_type_long_name, item_long_name, definition_link, registry, update, nesting_long_names=[]):
     value_types_defaults = registry.value_types_defaults 
     blender_property_mapping = registry.blender_property_mapping
-    is_item_value_type = item_long_name in value_types_defaults
+
+    is_item_value_type = item_long_name in blender_property_mapping
+    has_item_default_value = item_long_name in value_types_defaults
 
 
     wrapper_name = "wrapper_" + wrapped_type_long_name
@@ -42,15 +44,23 @@ def generate_wrapper_propertyGroup(wrapped_type_long_name, item_long_name, defin
 
 
     blender_property = StringProperty(default="", update=update)
-    if item_long_name in blender_property_mapping:
-        value = value_types_defaults[item_long_name] if is_item_value_type else None
-        blender_property_def = blender_property_mapping[item_long_name]
-        blender_property = blender_property_def["type"](
-            **blender_property_def["presets"],# we inject presets first
-            name = "property_name",
-            default = value,
-            update = update
-        )
+    if is_item_value_type:
+        value = value_types_defaults[item_long_name] if has_item_default_value else None
+        if has_item_default_value:
+            blender_property_def = blender_property_mapping[item_long_name]
+            blender_property = blender_property_def["type"](
+                **blender_property_def["presets"],# we inject presets first
+                name = "property_name",
+                default = value,
+                update = update
+            )
+        else:
+            blender_property_def = blender_property_mapping[item_long_name]
+            blender_property = blender_property_def["type"](
+                **blender_property_def["presets"],# we inject presets first
+                name = "property_name",
+                update = update
+            )
         
     wrapper_annotations = {
         '0' : blender_property

tools/blenvy/add_ons/bevy_components/registry/registry.py

@@ -25,6 +25,9 @@ def property_group_from_infos(property_group_name, property_group_parameters):
     
     return (property_group_pointer, property_group_class)
 
+def is_entity_poll(self, object):
+    return bpy.context.scene in object.users_scene # TODO: only select `object.type`s that get converted to entities and maybe something against other collection(instances)?
+
 # this is where we store the information for all available components
 class ComponentsRegistry(PropertyGroup):
     registry: bpy.props. StringProperty(
@@ -50,7 +53,6 @@ class ComponentsRegistry(PropertyGroup):
         "u32": dict(type=IntProperty, presets=dict(min=0)),
         "u64": dict(type=IntProperty, presets=dict(min=0)),
         "u128": dict(type=IntProperty, presets=dict(min=0)),
-        "u64": dict(type=IntProperty, presets=dict(min=0)),
         "usize": dict(type=IntProperty, presets=dict(min=0)),
 
         "i8": dict(type=IntProperty, presets=dict()),
@@ -90,19 +92,19 @@ class ComponentsRegistry(PropertyGroup):
 
         "enum":  dict(type=EnumProperty, presets=dict()), 
 
-        'bevy_ecs::entity::Entity': {"type": IntProperty, "presets": {"min":0} },
-        'bevy_utils::Uuid':  dict(type=StringProperty, presets=dict()),
+        "bevy_ecs::entity::Entity": dict(type = PointerProperty, presets=dict(type = bpy.types.Object, poll = is_entity_poll)),
+        "bevy_utils::Uuid": dict(type = StringProperty, presets=dict()),
     }
 
     value_types_defaults = {
         "string":" ",
-        "boolean": True,
+        "boolean": False,
         "float": 0.0,
         "uint": 0,
         "int":0,
 
         # todo : we are re-doing the work of the bevy /rust side here, but it seems more pratical to alway look for the same field name on the blender side for matches
-        "bool": True,
+        "bool": False,
 
         "u8": 0,
         "u16":0,
@@ -144,8 +146,7 @@ class ComponentsRegistry(PropertyGroup):
         "bevy_color::linear_rgba::LinearRgba": [1.0, 1.0, 0.0, 1.0],
         "bevy_color::hsva::Hsva": [1.0, 1.0, 0.0, 1.0],
 
-        'bevy_ecs::entity::Entity': 0,#4294967295, # this is the same as Bevy's Entity::Placeholder, too big for Blender..sigh
-        'bevy_utils::Uuid': '"'+str(uuid.uuid4())+'"'
+        "bevy_utils::Uuid": '"'+str(uuid.uuid4())+'"'
 
     }