15c54b5542
# Objective - Make it possible to move the light position around in the `shadow_biases` example - Also support resetting the depth/normal biases to the engine defaults, or zero. ## Solution - The light position is displayed in the text overlay. - The light position can be adjusted with left/right/up/down/pgup/pgdown. - The depth/normal biases can be reset to defaults by pressing R, or to zero by pressing Z. --------- Co-authored-by: robtfm <50659922+robtfm@users.noreply.github.com>
457 lines
15 KiB
Rust
457 lines
15 KiB
Rust
//! Demonstrates how shadow biases affect shadows in a 3d scene.
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use std::f32::consts::PI;
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use bevy::{input::mouse::MouseMotion, pbr::ShadowFilteringMethod, prelude::*};
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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(
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Update,
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(
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cycle_filter_methods,
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adjust_light_position,
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adjust_point_light_biases,
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toggle_light,
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adjust_directional_light_biases,
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camera_controller,
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),
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)
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.run();
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}
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#[derive(Component)]
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struct Lights;
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/// set up a 3D scene to test shadow biases and perspective projections
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fn setup(
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mut commands: Commands,
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mut meshes: ResMut<Assets<Mesh>>,
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mut materials: ResMut<Assets<StandardMaterial>>,
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) {
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let spawn_plane_depth = 300.0f32;
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let spawn_height = 2.0;
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let sphere_radius = 0.25;
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let white_handle = materials.add(StandardMaterial {
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base_color: Color::WHITE,
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perceptual_roughness: 1.0,
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..default()
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});
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let sphere_handle = meshes.add(
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Mesh::try_from(shape::Icosphere {
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radius: sphere_radius,
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..default()
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})
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.unwrap(),
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);
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let light_transform = Transform::from_xyz(5.0, 5.0, 0.0).looking_at(Vec3::ZERO, Vec3::Y);
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commands
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.spawn((
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SpatialBundle {
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transform: light_transform,
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..default()
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},
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Lights,
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))
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.with_children(|builder| {
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builder.spawn(PointLightBundle {
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point_light: PointLight {
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intensity: 0.0,
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range: spawn_plane_depth,
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color: Color::WHITE,
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shadow_depth_bias: 0.0,
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shadow_normal_bias: 0.0,
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shadows_enabled: true,
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..default()
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},
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..default()
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});
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builder.spawn(DirectionalLightBundle {
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directional_light: DirectionalLight {
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illuminance: 100000.0,
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shadow_depth_bias: 0.0,
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shadow_normal_bias: 0.0,
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shadows_enabled: true,
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..default()
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},
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..default()
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});
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});
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// camera
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commands.spawn((
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Camera3dBundle {
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transform: Transform::from_xyz(-1.0, 1.0, 1.0)
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.looking_at(Vec3::new(-1.0, 1.0, 0.0), Vec3::Y),
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..default()
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},
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CameraController::default(),
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ShadowFilteringMethod::Hardware2x2,
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));
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for z_i32 in (-spawn_plane_depth as i32..=0).step_by(2) {
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commands.spawn(PbrBundle {
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mesh: sphere_handle.clone(),
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material: white_handle.clone(),
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transform: Transform::from_xyz(
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0.0,
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if z_i32 % 4 == 0 {
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spawn_height
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} else {
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sphere_radius
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},
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z_i32 as f32,
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),
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..default()
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});
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}
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// ground plane
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commands.spawn(PbrBundle {
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mesh: meshes.add(shape::Plane::from_size(2.0 * spawn_plane_depth).into()),
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material: white_handle,
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..default()
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});
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let style = TextStyle {
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font_size: 20.,
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..default()
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};
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commands
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.spawn(NodeBundle {
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style: Style {
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position_type: PositionType::Absolute,
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padding: UiRect::all(Val::Px(5.0)),
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..default()
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},
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z_index: ZIndex::Global(i32::MAX),
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background_color: Color::BLACK.with_a(0.75).into(),
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..default()
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})
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.with_children(|c| {
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c.spawn(TextBundle::from_sections([
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TextSection::new("Controls:\n", style.clone()),
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TextSection::new("WSAD - forward/back/strafe left/right\n", style.clone()),
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TextSection::new("E / Q - up / down\n", style.clone()),
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TextSection::new("R / Z - reset biases to default / zero\n", style.clone()),
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TextSection::new(
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"L - switch between directional and point lights [",
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style.clone(),
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),
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TextSection::new("DirectionalLight", style.clone()),
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TextSection::new("]\n", style.clone()),
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TextSection::new(
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"F - switch directional light filter methods [",
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style.clone(),
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),
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TextSection::new("Hardware2x2", style.clone()),
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TextSection::new("]\n", style.clone()),
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TextSection::new("1/2 - change point light depth bias [", style.clone()),
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TextSection::new("0.00", style.clone()),
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TextSection::new("]\n", style.clone()),
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TextSection::new("3/4 - change point light normal bias [", style.clone()),
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TextSection::new("0.0", style.clone()),
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TextSection::new("]\n", style.clone()),
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TextSection::new("5/6 - change direction light depth bias [", style.clone()),
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TextSection::new("0.00", style.clone()),
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TextSection::new("]\n", style.clone()),
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TextSection::new(
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"7/8 - change direction light normal bias [",
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style.clone(),
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),
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TextSection::new("0.0", style.clone()),
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TextSection::new("]\n", style.clone()),
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TextSection::new(
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"left/right/up/down/pgup/pgdown - adjust light position (looking at 0,0,0) [",
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style.clone(),
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),
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TextSection::new(
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format!("{:.1},", light_transform.translation.x),
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style.clone(),
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),
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TextSection::new(
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format!(" {:.1},", light_transform.translation.y),
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style.clone(),
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),
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TextSection::new(
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format!(" {:.1}", light_transform.translation.z),
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style.clone(),
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),
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TextSection::new("]\n", style.clone()),
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]));
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});
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}
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fn toggle_light(
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input: Res<Input<KeyCode>>,
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mut point_lights: Query<&mut PointLight>,
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mut directional_lights: Query<&mut DirectionalLight>,
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mut example_text: Query<&mut Text>,
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) {
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if input.just_pressed(KeyCode::L) {
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for mut light in &mut point_lights {
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light.intensity = if light.intensity == 0.0 {
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example_text.single_mut().sections[5].value = "PointLight".to_string();
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100000000.0
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} else {
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0.0
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};
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}
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for mut light in &mut directional_lights {
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light.illuminance = if light.illuminance == 0.0 {
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example_text.single_mut().sections[5].value = "DirectionalLight".to_string();
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100000.0
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} else {
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0.0
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};
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}
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}
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}
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fn adjust_light_position(
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input: Res<Input<KeyCode>>,
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mut lights: Query<&mut Transform, With<Lights>>,
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mut example_text: Query<&mut Text>,
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) {
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let mut offset = Vec3::ZERO;
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if input.just_pressed(KeyCode::Left) {
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offset.x -= 1.0;
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}
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if input.just_pressed(KeyCode::Right) {
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offset.x += 1.0;
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}
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if input.just_pressed(KeyCode::Up) {
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offset.z -= 1.0;
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}
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if input.just_pressed(KeyCode::Down) {
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offset.z += 1.0;
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}
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if input.just_pressed(KeyCode::PageDown) {
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offset.y -= 1.0;
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}
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if input.just_pressed(KeyCode::PageUp) {
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offset.y += 1.0;
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}
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if offset != Vec3::ZERO {
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let mut example_text = example_text.single_mut();
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for mut light in &mut lights {
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light.translation += offset;
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light.look_at(Vec3::ZERO, Vec3::Y);
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example_text.sections[23].value = format!("{:.1},", light.translation.x);
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example_text.sections[24].value = format!(" {:.1},", light.translation.y);
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example_text.sections[25].value = format!(" {:.1}", light.translation.z);
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}
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}
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}
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fn cycle_filter_methods(
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input: Res<Input<KeyCode>>,
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mut filter_methods: Query<&mut ShadowFilteringMethod>,
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mut example_text: Query<&mut Text>,
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) {
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if input.just_pressed(KeyCode::F) {
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for mut filter_method in &mut filter_methods {
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let filter_method_string;
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*filter_method = match *filter_method {
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ShadowFilteringMethod::Hardware2x2 => {
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filter_method_string = "Castano13".to_string();
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ShadowFilteringMethod::Castano13
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}
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ShadowFilteringMethod::Castano13 => {
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filter_method_string = "Jimenez14".to_string();
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ShadowFilteringMethod::Jimenez14
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}
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ShadowFilteringMethod::Jimenez14 => {
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filter_method_string = "Hardware2x2".to_string();
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ShadowFilteringMethod::Hardware2x2
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}
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};
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example_text.single_mut().sections[8].value = filter_method_string;
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}
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}
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}
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fn adjust_point_light_biases(
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input: Res<Input<KeyCode>>,
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mut query: Query<&mut PointLight>,
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mut example_text: Query<&mut Text>,
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) {
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let depth_bias_step_size = 0.01;
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let normal_bias_step_size = 0.1;
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for mut light in &mut query {
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if input.just_pressed(KeyCode::Key1) {
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light.shadow_depth_bias -= depth_bias_step_size;
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}
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if input.just_pressed(KeyCode::Key2) {
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light.shadow_depth_bias += depth_bias_step_size;
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}
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if input.just_pressed(KeyCode::Key3) {
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light.shadow_normal_bias -= normal_bias_step_size;
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}
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if input.just_pressed(KeyCode::Key4) {
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light.shadow_normal_bias += normal_bias_step_size;
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}
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if input.just_pressed(KeyCode::R) {
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light.shadow_depth_bias = PointLight::DEFAULT_SHADOW_DEPTH_BIAS;
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light.shadow_normal_bias = PointLight::DEFAULT_SHADOW_NORMAL_BIAS;
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}
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if input.just_pressed(KeyCode::Z) {
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light.shadow_depth_bias = 0.0;
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light.shadow_normal_bias = 0.0;
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}
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example_text.single_mut().sections[11].value = format!("{:.2}", light.shadow_depth_bias);
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example_text.single_mut().sections[14].value = format!("{:.1}", light.shadow_normal_bias);
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}
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}
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fn adjust_directional_light_biases(
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input: Res<Input<KeyCode>>,
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mut query: Query<&mut DirectionalLight>,
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mut example_text: Query<&mut Text>,
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) {
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let depth_bias_step_size = 0.01;
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let normal_bias_step_size = 0.1;
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for mut light in &mut query {
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if input.just_pressed(KeyCode::Key5) {
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light.shadow_depth_bias -= depth_bias_step_size;
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}
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if input.just_pressed(KeyCode::Key6) {
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light.shadow_depth_bias += depth_bias_step_size;
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}
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if input.just_pressed(KeyCode::Key7) {
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light.shadow_normal_bias -= normal_bias_step_size;
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}
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if input.just_pressed(KeyCode::Key8) {
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light.shadow_normal_bias += normal_bias_step_size;
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}
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if input.just_pressed(KeyCode::R) {
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light.shadow_depth_bias = DirectionalLight::DEFAULT_SHADOW_DEPTH_BIAS;
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light.shadow_normal_bias = DirectionalLight::DEFAULT_SHADOW_NORMAL_BIAS;
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}
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if input.just_pressed(KeyCode::Z) {
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light.shadow_depth_bias = 0.0;
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light.shadow_normal_bias = 0.0;
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}
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example_text.single_mut().sections[17].value = format!("{:.2}", light.shadow_depth_bias);
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example_text.single_mut().sections[20].value = format!("{:.1}", light.shadow_normal_bias);
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}
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}
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#[derive(Component)]
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struct CameraController {
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pub enabled: bool,
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pub sensitivity: f32,
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pub key_forward: KeyCode,
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pub key_back: KeyCode,
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pub key_left: KeyCode,
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pub key_right: KeyCode,
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pub key_up: KeyCode,
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pub key_down: KeyCode,
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pub key_run: KeyCode,
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pub walk_speed: f32,
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pub run_speed: f32,
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pub friction: f32,
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pub pitch: f32,
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pub yaw: f32,
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pub velocity: Vec3,
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}
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impl Default for CameraController {
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fn default() -> Self {
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Self {
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enabled: true,
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sensitivity: 0.5,
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key_forward: KeyCode::W,
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key_back: KeyCode::S,
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key_left: KeyCode::A,
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key_right: KeyCode::D,
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key_up: KeyCode::E,
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key_down: KeyCode::Q,
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key_run: KeyCode::ShiftLeft,
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walk_speed: 10.0,
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run_speed: 30.0,
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friction: 0.5,
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pitch: 0.0,
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yaw: 0.0,
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velocity: Vec3::ZERO,
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}
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}
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}
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fn camera_controller(
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time: Res<Time>,
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mut mouse_events: EventReader<MouseMotion>,
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key_input: Res<Input<KeyCode>>,
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mut query: Query<(&mut Transform, &mut CameraController), With<Camera>>,
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) {
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let dt = time.delta_seconds();
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// Handle mouse input
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let mut mouse_delta = Vec2::ZERO;
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for mouse_event in mouse_events.read() {
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mouse_delta += mouse_event.delta;
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}
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for (mut transform, mut options) in &mut query {
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if !options.enabled {
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continue;
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}
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// Handle key input
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let mut axis_input = Vec3::ZERO;
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if key_input.pressed(options.key_forward) {
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axis_input.z += 1.0;
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}
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if key_input.pressed(options.key_back) {
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axis_input.z -= 1.0;
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}
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if key_input.pressed(options.key_right) {
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axis_input.x += 1.0;
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}
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if key_input.pressed(options.key_left) {
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axis_input.x -= 1.0;
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}
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if key_input.pressed(options.key_up) {
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axis_input.y += 1.0;
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}
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if key_input.pressed(options.key_down) {
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axis_input.y -= 1.0;
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}
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// Apply movement update
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if axis_input != Vec3::ZERO {
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let max_speed = if key_input.pressed(options.key_run) {
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options.run_speed
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} else {
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options.walk_speed
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};
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options.velocity = axis_input.normalize() * max_speed;
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} else {
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let friction = options.friction.clamp(0.0, 1.0);
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options.velocity *= 1.0 - friction;
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if options.velocity.length_squared() < 1e-6 {
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options.velocity = Vec3::ZERO;
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}
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}
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let forward = transform.forward();
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let right = transform.right();
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transform.translation += options.velocity.x * dt * right
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+ options.velocity.y * dt * Vec3::Y
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+ options.velocity.z * dt * forward;
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if mouse_delta != Vec2::ZERO {
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// Apply look update
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options.pitch = (options.pitch - mouse_delta.y * 0.5 * options.sensitivity * dt)
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.clamp(-PI / 2., PI / 2.);
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options.yaw -= mouse_delta.x * options.sensitivity * dt;
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transform.rotation = Quat::from_euler(EulerRot::ZYX, 0.0, options.yaw, options.pitch);
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}
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}
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}
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