Basic scene serialization crashing

[celest flare]

I have a system:

fn beep(world: &mut World) {
    let type_registry = world.resource::<AppTypeRegistry>();
    let scene = DynamicScene::from_world(world, type_registry);

    let serialized_scene = scene.serialize_ron(type_registry).unwrap();

    info!("{}", serialized_scene);
}

Which works fine. Then when i add this:

fn start_up(mut commands: Commands, mut clear_color: ResMut<ClearColor>) {
    commands.spawn(Camera2dBundle::default());
    clear_color.0 = Color::BLACK;
}

I get a crash: "no registration found for dynamic type with name bevy_math::rect::Rect". If i comment out the line where im spawning the camera, it works again.

Whats going on here? I'm feeling very dumb atm.

Also, if i dont want the whole world, do i just query for the entities and resources that i want, place them in an empty world, then serialize that instead?

And another thing...It appears the example in the git repo doesnt even serialize or save the resource? I would very much like to do that, please.

[red plume]

The scene example (https://github.com/bevyengine/bevy/blob/main/examples/scene/scene.rs) should save the file scene right next to the scene asset file if you run it

From the error, it seems a registration is missing. You can add it yourself by registering Rect, but realistically Bevy should be registering its own types for you, so please file an issue/PR

And if you don’t want the whole world, check out DynamicSceneBuilder which lets you query for specific entities

[celest flare]

Sorry, I dont think i was clear. In that example, they insert ResourceA { score: 1 } into the scene, but when i serialize that on my end, only the added entities show up in the file, theres no resource struct with a score value.

[celest flare]

Yeah i ran into this myself but it only seems to work with entities. If I have a resource for the user's settings, for example the graphical preferences or something, id want to be able to save that as a scene, right? Am i misinterpreting what these scenes are used for?

[red plume]

Did you register your resource type?

Also, did you add #[reflect(Resource)] on the resource type definition?

[red plume]

There’s an extract_resources method that you’ll need to call in order to extract them

Oh my apologies

Resource extraction is not released yet it seems. I guess it’s a 0.11 thing, which means it’ll be available on crates.io very soon

[celest flare]

I didnt do this, im testing it now. I did do #[reflect(Resource)] tho

[celest flare]

thanks for letting me know!

[red plume]

It still probably won’t work

Yeah sorry for the confusion haha

[celest flare]

mhm, yes can confirm doesnt work lol

[red plume]

It exists on main just not latest

[celest flare]

so like, up until this point, ppl haven't been able to save resources into scenes?

[red plume]

I guess not haha

[celest flare]

My goodness

[red plume]

You could hack it together by using a resource-like component

But for your case I’d just wait

It’s supposedly going to be released this weekend

[celest flare]

Yeah it just made sense to make a it a resource, since its a global setting thing. But if its that close then i can wait until 0.11 is out. Thanks for the help!

[red plume]

No problem!

If you want, you could also start targeting main

Then just switch to 0.11 on release

[celest flare]

Oh and regarding this. I find it so hard to believe that this hasnt been caught by someone else, i just felt it may have been specific to my situation somehow, or the fact that maybe serializing an entire world, including the camera, was not something i was supposed to do?

[celest flare]

Good idea 🙂

[red plume]

Yeah that is a bit weird. I wonder if it’s still an issue on main 🤔