mirror of
https://github.com/bevyengine/bevy
synced 2024-12-30 06:53:13 +00:00
25bfa80e60
# Objective Yet another PR for migrating stuff to required components. This time, cameras! ## Solution As per the [selected proposal](https://hackmd.io/tsYID4CGRiWxzsgawzxG_g#Combined-Proposal-1-Selected), deprecate `Camera2dBundle` and `Camera3dBundle` in favor of `Camera2d` and `Camera3d`. Adding a `Camera` without `Camera2d` or `Camera3d` now logs a warning, as suggested by Cart [on Discord](https://discord.com/channels/691052431525675048/1264881140007702558/1291506402832945273). I would personally like cameras to work a bit differently and be split into a few more components, to avoid some footguns and confusing semantics, but that is more controversial, and shouldn't block this core migration. ## Testing I ran a few 2D and 3D examples, and tried cameras with and without render graphs. --- ## Migration Guide `Camera2dBundle` and `Camera3dBundle` have been deprecated in favor of `Camera2d` and `Camera3d`. Inserting them will now also insert the other components required by them automatically.
112 lines
3.5 KiB
Markdown
112 lines
3.5 KiB
Markdown
# B0004
|
|
|
|
A runtime warning.
|
|
|
|
An [`Entity`] with a hierarchy-inherited component has a [`Parent`]
|
|
without the hierarchy-inherited component in question.
|
|
|
|
The hierarchy-inherited components defined in bevy include:
|
|
|
|
- [`InheritedVisibility`]
|
|
- [`GlobalTransform`]
|
|
|
|
Third party plugins may also define their own hierarchy components, so
|
|
read the warning message carefully and pay attention to the exact type
|
|
of the missing component.
|
|
|
|
To fix this warning, add the missing hierarchy component to all ancestors
|
|
of entities with the hierarchy component you wish to use.
|
|
|
|
The following code will cause a warning to be emitted:
|
|
|
|
```rust,no_run
|
|
use bevy::prelude::*;
|
|
|
|
// WARNING: this code is buggy
|
|
fn setup_cube(
|
|
mut commands: Commands,
|
|
mut meshes: ResMut<Assets<Mesh>>,
|
|
mut materials: ResMut<Assets<StandardMaterial>>,
|
|
) {
|
|
commands
|
|
.spawn(Transform::default())
|
|
.with_children(|parent| {
|
|
// cube
|
|
parent.spawn((
|
|
Mesh3d(meshes.add(Cuboid::default())),
|
|
MeshMaterial3d(materials.add(Color::rgb(0.8, 0.7, 0.6))),
|
|
Transform::from_xyz(0.0, 0.5, 0.0),
|
|
));
|
|
});
|
|
|
|
// camera
|
|
commands.spawn((
|
|
Camera3d::default(),
|
|
Transform::from_xyz(-2.0, 2.5, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
|
|
));
|
|
}
|
|
|
|
fn main() {
|
|
App::new()
|
|
.add_plugins(DefaultPlugins)
|
|
.add_systems(Startup, setup_cube)
|
|
.run();
|
|
}
|
|
```
|
|
|
|
This code **will not** show a cube on screen.
|
|
This is because the entity spawned with `commands.spawn(…)`
|
|
doesn't have a [`ViewVisibility`] or [`InheritedVisibility`] component.
|
|
Since the cube is spawned as a child of an entity without the
|
|
visibility components, it will not be visible at all.
|
|
|
|
To fix this, you must also add a [`Visibility`] component.
|
|
It automatically adds the other relevant visibility components for you:
|
|
|
|
```rust,no_run
|
|
use bevy::prelude::*;
|
|
|
|
fn setup_cube(
|
|
mut commands: Commands,
|
|
mut meshes: ResMut<Assets<Mesh>>,
|
|
mut materials: ResMut<Assets<StandardMaterial>>,
|
|
) {
|
|
commands
|
|
.spawn((Transform::default(), Visibility::default()))
|
|
.with_children(|parent| {
|
|
// cube
|
|
parent.spawn((
|
|
Mesh3d(meshes.add(Cuboid::default())),
|
|
MeshMaterial3d(materials.add(Color::rgb(0.8, 0.7, 0.6))),
|
|
Transform::from_xyz(0.0, 0.5, 0.0),
|
|
));
|
|
});
|
|
|
|
// camera
|
|
commands.spawn((
|
|
Camera3d::default(),
|
|
Transform::from_xyz(-2.0, 2.5, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
|
|
));
|
|
}
|
|
|
|
fn main() {
|
|
App::new()
|
|
.add_plugins(DefaultPlugins)
|
|
.add_systems(Startup, setup_cube)
|
|
.run();
|
|
}
|
|
```
|
|
|
|
A similar problem occurs when the [`GlobalTransform`] component is missing.
|
|
However, it will be automatically inserted whenever `Transform` is
|
|
inserted, as it is a required component.
|
|
|
|
You will most likely encounter this warning when loading a scene
|
|
as a child of a pre-existing [`Entity`] that does not have the proper components.
|
|
|
|
[`InheritedVisibility`]: https://docs.rs/bevy/*/bevy/render/view/struct.InheritedVisibility.html
|
|
[`ViewVisibility`]: https://docs.rs/bevy/*/bevy/render/view/struct.ViewVisibility.html
|
|
[`Visibility`]: https://docs.rs/bevy/*/bevy/render/view/struct.Visibility.html
|
|
[`GlobalTransform`]: https://docs.rs/bevy/*/bevy/transform/components/struct.GlobalTransform.html
|
|
[`Parent`]: https://docs.rs/bevy/*/bevy/hierarchy/struct.Parent.html
|
|
[`Entity`]: https://docs.rs/bevy/*/bevy/ecs/entity/struct.Entity.html
|