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pbr.rs
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pbr.rs
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//! This example shows how to configure Physically Based Rendering (PBR) parameters.
use bevy::{asset::LoadState, prelude::*};
fn main() {
App::new()
.add_plugins(DefaultPlugins)
.add_systems(Startup, setup)
.add_systems(Update, environment_map_load_finish)
.run();
}
/// set up a simple 3D scene
fn setup(
mut commands: Commands,
mut meshes: ResMut<Assets<Mesh>>,
mut materials: ResMut<Assets<StandardMaterial>>,
asset_server: Res<AssetServer>,
) {
let sphere_mesh = meshes.add(Sphere::new(0.45));
// add entities to the world
for y in -2..=2 {
for x in -5..=5 {
let x01 = (x + 5) as f32 / 10.0;
let y01 = (y + 2) as f32 / 4.0;
// sphere
commands.spawn(PbrBundle {
mesh: sphere_mesh.clone(),
material: materials.add(StandardMaterial {
base_color: Color::hex("#ffd891").unwrap(),
// vary key PBR parameters on a grid of spheres to show the effect
metallic: y01,
perceptual_roughness: x01,
..default()
}),
transform: Transform::from_xyz(x as f32, y as f32 + 0.5, 0.0),
..default()
});
}
}
// unlit sphere
commands.spawn(PbrBundle {
mesh: sphere_mesh,
material: materials.add(StandardMaterial {
base_color: Color::hex("#ffd891").unwrap(),
// vary key PBR parameters on a grid of spheres to show the effect
unlit: true,
..default()
}),
transform: Transform::from_xyz(-5.0, -2.5, 0.0),
..default()
});
commands.spawn(DirectionalLightBundle {
transform: Transform::from_xyz(50.0, 50.0, 50.0).looking_at(Vec3::ZERO, Vec3::Y),
directional_light: DirectionalLight {
illuminance: 1_500.,
..default()
},
..default()
});
// labels
commands.spawn(
TextBundle::from_section(
"Perceptual Roughness",
TextStyle {
font_size: 36.0,
..default()
},
)
.with_style(Style {
position_type: PositionType::Absolute,
top: Val::Px(20.0),
left: Val::Px(100.0),
..default()
}),
);
commands.spawn(TextBundle {
text: Text::from_section(
"Metallic",
TextStyle {
font_size: 36.0,
..default()
},
),
style: Style {
position_type: PositionType::Absolute,
top: Val::Px(130.0),
right: Val::ZERO,
..default()
},
transform: Transform {
rotation: Quat::from_rotation_z(std::f32::consts::PI / 2.0),
..default()
},
..default()
});
commands.spawn((
TextBundle::from_section(
"Loading Environment Map...",
TextStyle {
font_size: 36.0,
color: Color::RED,
..default()
},
)
.with_style(Style {
position_type: PositionType::Absolute,
bottom: Val::Px(20.0),
right: Val::Px(20.0),
..default()
}),
EnvironmentMapLabel,
));
// camera
commands.spawn((
Camera3dBundle {
transform: Transform::from_xyz(0.0, 0.0, 8.0).looking_at(Vec3::default(), Vec3::Y),
projection: OrthographicProjection {
scale: 0.01,
..default()
}
.into(),
..default()
},
EnvironmentMapLight {
diffuse_map: asset_server.load("environment_maps/pisa_diffuse_rgb9e5_zstd.ktx2"),
specular_map: asset_server.load("environment_maps/pisa_specular_rgb9e5_zstd.ktx2"),
intensity: 900.0,
},
));
}
fn environment_map_load_finish(
mut commands: Commands,
asset_server: Res<AssetServer>,
environment_maps: Query<&EnvironmentMapLight>,
label_query: Query<Entity, With<EnvironmentMapLabel>>,
) {
if let Ok(environment_map) = environment_maps.get_single() {
if asset_server.load_state(&environment_map.diffuse_map) == LoadState::Loaded
&& asset_server.load_state(&environment_map.specular_map) == LoadState::Loaded
{
if let Ok(label_entity) = label_query.get_single() {
commands.entity(label_entity).despawn();
}
}
}
}
#[derive(Component)]
struct EnvironmentMapLabel;