a00c71ee5b
# Objective - Example `deterministic` crashes on CI on Windows because it uses too much memory ## Solution - Reduce the number of planes displayed while still having the issue - While there, add a small margin to the text so that it's prettier
94 lines
3.0 KiB
Rust
94 lines
3.0 KiB
Rust
//! Shows how to enable deterministic rendering which helps with flickering due to z-fighting.
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//! Rendering is not deterministic by default.
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//! Note most users don't need rendering to be deterministic, and should rely on depth bias instead.
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use bevy::app::App;
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use bevy::app::Startup;
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use bevy::prelude::shape::Plane;
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use bevy::prelude::*;
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use bevy::render::deterministic::DeterministicRenderingConfig;
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.add_systems(Startup, setup)
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.add_systems(Update, (keys, update_help).chain())
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.run();
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}
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fn setup(
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mut commands: Commands,
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mut materials: ResMut<Assets<StandardMaterial>>,
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mut meshes: ResMut<Assets<Mesh>>,
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mut deterministic_rendering_config: ResMut<DeterministicRenderingConfig>,
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) {
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// Safe default.
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deterministic_rendering_config.stable_sort_z_fighting = true;
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// Help message will be rendered there.
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commands.spawn(TextBundle::default().with_style(Style {
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position_type: PositionType::Absolute,
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top: Val::Px(12.0),
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left: Val::Px(12.0),
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..default()
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}));
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commands.spawn(Camera3dBundle {
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transform: Transform::from_xyz(3.0, 3.0, 3.0).looking_at(Vec3::new(0., 0., 0.), Vec3::Y),
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..default()
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});
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let mesh = meshes.add(Plane::from_size(2.0));
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let nb_plane = 10;
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for i in 0..nb_plane {
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let color = Color::hsl(i as f32 * 360.0 / nb_plane as f32, 1.0, 0.5);
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commands.spawn(PbrBundle {
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mesh: mesh.clone(),
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material: materials.add(StandardMaterial {
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base_color: color,
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// Setting depth bias would be a default choice to fix z-fighting.
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// When it is not possible, deterministic rendering can be used.
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// Here we intentionally don't use depth bias to demonstrate the issue.
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depth_bias: 0.0,
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unlit: true,
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..Default::default()
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}),
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..default()
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});
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}
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}
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fn keys(
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mut deterministic_rendering_config: ResMut<DeterministicRenderingConfig>,
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keyboard_input: Res<ButtonInput<KeyCode>>,
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) {
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if keyboard_input.just_pressed(KeyCode::KeyD) {
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deterministic_rendering_config.stable_sort_z_fighting ^= true;
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}
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}
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fn update_help(
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mut text: Query<&mut Text>,
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deterministic_rendering_config: Res<DeterministicRenderingConfig>,
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) {
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if deterministic_rendering_config.is_changed() {
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*text.single_mut() = Text::from_section(
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format!(
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"\
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Press D to enable/disable deterministic rendering\n\
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\n\
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Deterministic rendering: {}\n\
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\n\
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When rendering is not deterministic, you may notice flickering due to z-fighting\n\
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\n\
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Warning: may cause seizures for people with photosensitive epilepsy",
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deterministic_rendering_config.stable_sort_z_fighting
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),
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TextStyle {
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font_size: 20.,
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..default()
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},
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);
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}
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}
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