UI camera flexibility regression

[nicopap]

Bevy version

bf1ca81

What you did

In bevy 0.7, it was possible to manipulate individually ui cameras such as in this example.

What went wrong

With changes made to the way ui is handled in #4745, such design is impossible to execute. Manipulating UI cameras can be useful for fancy game effects, and it would be a shame to lose this flexibility.

[ThierryBerger]

What exactly is impossible ?

I'll suppose you're referring to:

fn cam_system(
    mut cam: Query<(&mut Transform, &mut OrthographicProjection), With<CameraUi>>,
    input: Res<Input<KeyCode>>,
) {

By "manipulating camera", you mean changing the OrthographicProjection ? Would Projection be helpful ?

[nicopap]

Would Projection be helpful ?

Since #4745 "CameraUi" is not a thing independent from other cameras, it's just a component to toggle ui visibility on a specific camera.

You can see in extract_default_ui_camera_view that now, the UI camera perspective is a set value, and it's not accessible from the main app world. This PR adds a way to manipulate that camera perspective, through CameraUiConfig