Closed
Description
Bevy version
0.5
Operating system & version
Windows 10
What you did
pub use bevy::prelude::*;
pub struct Tooltips;
pub fn test_square(mut commands: Commands, mut materials: ResMut<Assets<ColorMaterial>>) {
commands
.spawn_bundle(NodeBundle { // blue square
style: Style {
size: Size::new(Val::Px(200.0), Val::Px(200.0)),
position_type: PositionType::Absolute,
..Default::default()
},
material: materials.add(Color::rgb(0.4, 0.4, 1.0).into()),
..Default::default()
})
//.insert(Tooltips) // WHEN THIS LINE IS ON, THE TEST SQUARE DOES NOT SHOW UP
;
}
pub fn spawn_hud(mut commands: Commands, mut materials: ResMut<Assets<ColorMaterial>>) {
commands.spawn_bundle(UiCameraBundle::default());
commands
/* ui root node */
.spawn_bundle(NodeBundle {
style: Style {
size: Size::new(Val::Percent(100.0), Val::Percent(100.0)),
..Default::default()
},
material: materials.add(Color::rgba_u8(0, 0, 0, 0).into()),
..Default::default()
})
.with_children(|parent| {
parent.spawn_bundle(NodeBundle {
material: materials.add(Color::BLACK.into()),
..Default::default()
});
});
}
pub fn main() {
App::build()
.insert_resource(ClearColor(Color::rgb_u8(10, 10, 10)))
.insert_resource(WindowDescriptor {
width: (32. * 20.),
height: (32. * 15.),
..Default::default()
})
.add_plugins(DefaultPlugins)
.add_startup_system(spawn_hud.system())
.add_startup_system(test_square.system())
.run();
}What you expected to happen
The square appears, or doesn't.
What actually happened
Adding the marker component to the entity changes the relative order of the square and the HUD, causing the square to disappear.
Removing or tweaking most of the other values (window size, clear_color, presence of the child on the HUD) also tends to change the behavior. Altering colors or changing the square's size seems to preserve the surprising behavior.
Additional information
Using multiple root UI nodes is currently (silently) unsupported; this . I think this is z-fighting in very unstable and surprising ways. #1211 attempts to allow for multiple UI root nodes.
@automeowtion on Discord reported this bug and gave the reproduction shown above here.