Is there a more granular way to track changes?

[SarthakSingh31]

I have a struct:

pub enum GameScene {
    Menu,
    Build {
        loaded: bool,
        builds: Vec<unit::build::Build>,
        parts: Option<unit::build::AllParts>,
        textures: Vec<Handle<Texture>>,
    },
    Fight { level: level::Level, mode: FightMode },
    GameOver,
}

I can track changes on GameScene but can I track which one of the fields GameScene::Build::{loaded/builds/parts/textures} changed?

I don't want to manually track the change because then I will have to use ResMut<GameScene> everywhere to update the internal tracking. GameScene::is_changed will also become meaningless.

[mockersf]

Bevy change detection is on resource level, so no, no built in more granular way...

That said:

• you could split your resource into smaller ones, grouping them by things that make sense to be used together for change detection
• you would probably need a ResMut<GameScene> to update change tracking only when you update the resource, so you should already have a ResMut?
• you could look into rust patterns for interior mutability for your change detection if that's an issue

[SarthakSingh31]

Interior mutability looks promising. I will try it.