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Add example for bounding volumes and intersection tests (#11666)
# Objective - Create an example for bounding volumes and intersection tests ## Solution - Add an example with a few bounding volumes, created from primitives - Allow the user to cycle trough the different intersection tests
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11
Cargo.toml
11
Cargo.toml
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@ -528,6 +528,17 @@ description = "Shows how to create graphics that snap to the pixel grid by rende
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category = "2D Rendering"
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wasm = true
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[[example]]
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name = "bounding_2d"
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path = "examples/2d/bounding_2d.rs"
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doc-scrape-examples = true
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[package.metadata.example.bounding_2d]
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name = "2D Bounding Volume Intersections"
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description = "Showcases bounding volumes and intersection tests"
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category = "2D Rendering"
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wasm = true
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# 3D Rendering
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[[example]]
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name = "3d_scene"
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444
examples/2d/bounding_2d.rs
Normal file
444
examples/2d/bounding_2d.rs
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@ -0,0 +1,444 @@
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//! This example demonstrates bounding volume intersections.
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use bevy::{math::bounding::*, prelude::*};
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.init_state::<Test>()
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.add_systems(Startup, setup)
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.add_systems(
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Update,
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(update_text, spin, update_volumes, update_test_state),
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)
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.add_systems(
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PostUpdate,
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(
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render_shapes,
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(
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aabb_intersection_system.run_if(in_state(Test::AabbSweep)),
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circle_intersection_system.run_if(in_state(Test::CircleSweep)),
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ray_cast_system.run_if(in_state(Test::RayCast)),
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aabb_cast_system.run_if(in_state(Test::AabbCast)),
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bounding_circle_cast_system.run_if(in_state(Test::CircleCast)),
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),
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render_volumes,
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)
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.chain(),
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)
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.run();
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}
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#[derive(Component)]
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struct Spin;
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fn spin(time: Res<Time>, mut query: Query<&mut Transform, With<Spin>>) {
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for mut transform in query.iter_mut() {
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transform.rotation *= Quat::from_rotation_z(time.delta_seconds() / 5.);
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}
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}
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#[derive(States, Default, Debug, Hash, PartialEq, Eq, Clone, Copy)]
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enum Test {
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AabbSweep,
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CircleSweep,
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#[default]
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RayCast,
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AabbCast,
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CircleCast,
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}
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fn update_test_state(
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keycode: Res<ButtonInput<KeyCode>>,
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cur_state: Res<State<Test>>,
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mut state: ResMut<NextState<Test>>,
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) {
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if !keycode.just_pressed(KeyCode::Space) {
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return;
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}
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use Test::*;
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let next = match **cur_state {
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AabbSweep => CircleSweep,
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CircleSweep => RayCast,
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RayCast => AabbCast,
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AabbCast => CircleCast,
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CircleCast => AabbSweep,
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};
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state.set(next);
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}
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fn update_text(mut text: Query<&mut Text>, cur_state: Res<State<Test>>) {
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if !cur_state.is_changed() {
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return;
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}
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let mut text = text.single_mut();
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let text = &mut text.sections[0].value;
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text.clear();
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text.push_str("Intersection test:\n");
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use Test::*;
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for &test in &[AabbSweep, CircleSweep, RayCast, AabbCast, CircleCast] {
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let s = if **cur_state == test { "*" } else { " " };
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text.push_str(&format!(" {s} {test:?} {s}\n"));
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}
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text.push_str("\npress Space to cycle");
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}
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#[derive(Component)]
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enum Shape {
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Rectangle(Rectangle),
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Circle(Circle),
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Triangle(Triangle2d),
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Line(Segment2d),
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Capsule(Capsule2d),
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Polygon(RegularPolygon),
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}
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fn render_shapes(mut gizmos: Gizmos, query: Query<(&Shape, &Transform)>) {
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let color = Color::GRAY;
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for (shape, transform) in query.iter() {
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let translation = transform.translation.xy();
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let rotation = transform.rotation.to_euler(EulerRot::YXZ).2;
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match shape {
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Shape::Rectangle(r) => {
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gizmos.primitive_2d(*r, translation, rotation, color);
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}
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Shape::Circle(c) => {
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gizmos.primitive_2d(*c, translation, rotation, color);
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}
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Shape::Triangle(t) => {
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gizmos.primitive_2d(*t, translation, rotation, color);
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}
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Shape::Line(l) => {
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gizmos.primitive_2d(*l, translation, rotation, color);
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}
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Shape::Capsule(c) => {
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gizmos.primitive_2d(*c, translation, rotation, color);
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}
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Shape::Polygon(p) => {
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gizmos.primitive_2d(*p, translation, rotation, color);
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}
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}
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}
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}
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#[derive(Component)]
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enum DesiredVolume {
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Aabb,
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Circle,
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}
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#[derive(Component, Debug)]
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enum CurrentVolume {
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Aabb(Aabb2d),
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Circle(BoundingCircle),
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}
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fn update_volumes(
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mut commands: Commands,
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query: Query<
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(Entity, &DesiredVolume, &Shape, &Transform),
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Or<(Changed<DesiredVolume>, Changed<Shape>, Changed<Transform>)>,
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>,
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) {
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for (entity, desired_volume, shape, transform) in query.iter() {
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let translation = transform.translation.xy();
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let rotation = transform.rotation.to_euler(EulerRot::YXZ).2;
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match desired_volume {
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DesiredVolume::Aabb => {
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let aabb = match shape {
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Shape::Rectangle(r) => r.aabb_2d(translation, rotation),
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Shape::Circle(c) => c.aabb_2d(translation, rotation),
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Shape::Triangle(t) => t.aabb_2d(translation, rotation),
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Shape::Line(l) => l.aabb_2d(translation, rotation),
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Shape::Capsule(c) => c.aabb_2d(translation, rotation),
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Shape::Polygon(p) => p.aabb_2d(translation, rotation),
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};
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commands.entity(entity).insert(CurrentVolume::Aabb(aabb));
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}
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DesiredVolume::Circle => {
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let circle = match shape {
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Shape::Rectangle(r) => r.bounding_circle(translation, rotation),
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Shape::Circle(c) => c.bounding_circle(translation, rotation),
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Shape::Triangle(t) => t.bounding_circle(translation, rotation),
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Shape::Line(l) => l.bounding_circle(translation, rotation),
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Shape::Capsule(c) => c.bounding_circle(translation, rotation),
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Shape::Polygon(p) => p.bounding_circle(translation, rotation),
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};
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commands
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.entity(entity)
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.insert(CurrentVolume::Circle(circle));
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}
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}
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}
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}
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fn render_volumes(mut gizmos: Gizmos, query: Query<(&CurrentVolume, &Intersects)>) {
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for (volume, intersects) in query.iter() {
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let color = if **intersects {
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Color::CYAN
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} else {
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Color::ORANGE_RED
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};
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match volume {
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CurrentVolume::Aabb(a) => {
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gizmos.rect_2d(a.center(), 0., a.half_size() * 2., color);
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}
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CurrentVolume::Circle(c) => {
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gizmos.circle_2d(c.center(), c.radius(), color);
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}
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}
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}
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}
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#[derive(Component, Deref, DerefMut, Default)]
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struct Intersects(bool);
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const OFFSET_X: f32 = 125.;
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const OFFSET_Y: f32 = 75.;
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fn setup(mut commands: Commands, loader: Res<AssetServer>) {
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commands.spawn(Camera2dBundle::default());
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commands.spawn((
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SpatialBundle {
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transform: Transform::from_xyz(-OFFSET_X, OFFSET_Y, 0.),
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..default()
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},
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Shape::Circle(Circle::new(45.)),
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DesiredVolume::Aabb,
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Intersects::default(),
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));
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commands.spawn((
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SpatialBundle {
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transform: Transform::from_xyz(0., OFFSET_Y, 0.),
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..default()
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},
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Shape::Rectangle(Rectangle::new(80., 80.)),
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Spin,
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DesiredVolume::Circle,
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Intersects::default(),
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));
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commands.spawn((
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SpatialBundle {
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transform: Transform::from_xyz(OFFSET_X, OFFSET_Y, 0.),
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..default()
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},
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Shape::Triangle(Triangle2d::new(
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Vec2::new(-40., -40.),
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Vec2::new(-20., 40.),
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Vec2::new(40., 50.),
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)),
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Spin,
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DesiredVolume::Aabb,
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Intersects::default(),
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));
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commands.spawn((
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SpatialBundle {
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transform: Transform::from_xyz(-OFFSET_X, -OFFSET_Y, 0.),
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..default()
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},
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Shape::Line(Segment2d::new(Direction2d::from_xy(1., 0.3).unwrap(), 90.)),
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Spin,
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DesiredVolume::Circle,
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Intersects::default(),
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));
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commands.spawn((
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SpatialBundle {
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transform: Transform::from_xyz(0., -OFFSET_Y, 0.),
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..default()
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},
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Shape::Capsule(Capsule2d::new(25., 50.)),
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Spin,
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DesiredVolume::Aabb,
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Intersects::default(),
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));
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commands.spawn((
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SpatialBundle {
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transform: Transform::from_xyz(OFFSET_X, -OFFSET_Y, 0.),
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..default()
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},
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Shape::Polygon(RegularPolygon::new(50., 6)),
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Spin,
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DesiredVolume::Circle,
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Intersects::default(),
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));
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commands.spawn(
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TextBundle::from_section(
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"",
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TextStyle {
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font: loader.load("fonts/FiraMono-Medium.ttf"),
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font_size: 26.0,
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..default()
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},
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)
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.with_style(Style {
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position_type: PositionType::Absolute,
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bottom: Val::Px(10.0),
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left: Val::Px(10.0),
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..default()
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}),
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);
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}
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fn draw_ray(gizmos: &mut Gizmos, ray: &RayCast2d) {
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gizmos.line_2d(
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ray.ray.origin,
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ray.ray.origin + *ray.ray.direction * ray.max,
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Color::WHITE,
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);
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for r in [1., 2., 3.] {
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gizmos.circle_2d(ray.ray.origin, r, Color::FUCHSIA);
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}
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}
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fn get_and_draw_ray(gizmos: &mut Gizmos, time: &Time) -> RayCast2d {
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let ray = Vec2::new(time.elapsed_seconds().cos(), time.elapsed_seconds().sin());
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let dist = 150. + (0.5 * time.elapsed_seconds()).sin().abs() * 500.;
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let aabb_ray = Ray2d {
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origin: ray * 250.,
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direction: Direction2d::new_unchecked(-ray),
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};
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let ray_cast = RayCast2d::from_ray(aabb_ray, dist - 20.);
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draw_ray(gizmos, &ray_cast);
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ray_cast
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}
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fn ray_cast_system(
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mut gizmos: Gizmos,
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time: Res<Time>,
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mut volumes: Query<(&CurrentVolume, &mut Intersects)>,
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) {
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let ray_cast = get_and_draw_ray(&mut gizmos, &time);
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for (volume, mut intersects) in volumes.iter_mut() {
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let toi = match volume {
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CurrentVolume::Aabb(a) => ray_cast.aabb_intersection_at(a),
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CurrentVolume::Circle(c) => ray_cast.circle_intersection_at(c),
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};
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**intersects = toi.is_some();
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if let Some(toi) = toi {
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for r in [1., 2., 3.] {
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gizmos.circle_2d(
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ray_cast.ray.origin + *ray_cast.ray.direction * toi,
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r,
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Color::GREEN,
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);
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}
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}
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}
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}
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fn aabb_cast_system(
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mut gizmos: Gizmos,
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time: Res<Time>,
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mut volumes: Query<(&CurrentVolume, &mut Intersects)>,
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) {
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let ray_cast = get_and_draw_ray(&mut gizmos, &time);
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let aabb_cast = AabbCast2d {
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aabb: Aabb2d::new(Vec2::ZERO, Vec2::splat(15.)),
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ray: ray_cast,
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};
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for (volume, mut intersects) in volumes.iter_mut() {
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let toi = match *volume {
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CurrentVolume::Aabb(a) => aabb_cast.aabb_collision_at(a),
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CurrentVolume::Circle(_) => None,
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};
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**intersects = toi.is_some();
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if let Some(toi) = toi {
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gizmos.rect_2d(
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aabb_cast.ray.ray.origin
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+ *aabb_cast.ray.ray.direction * toi
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+ aabb_cast.aabb.center(),
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0.,
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aabb_cast.aabb.half_size() * 2.,
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Color::GREEN,
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);
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}
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}
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}
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fn bounding_circle_cast_system(
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mut gizmos: Gizmos,
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time: Res<Time>,
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mut volumes: Query<(&CurrentVolume, &mut Intersects)>,
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) {
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let ray_cast = get_and_draw_ray(&mut gizmos, &time);
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let circle_cast = BoundingCircleCast {
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circle: BoundingCircle::new(Vec2::ZERO, 15.),
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ray: ray_cast,
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};
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for (volume, mut intersects) in volumes.iter_mut() {
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let toi = match *volume {
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CurrentVolume::Aabb(_) => None,
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CurrentVolume::Circle(c) => circle_cast.circle_collision_at(c),
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};
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**intersects = toi.is_some();
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if let Some(toi) = toi {
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gizmos.circle_2d(
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circle_cast.ray.ray.origin
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+ *circle_cast.ray.ray.direction * toi
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+ circle_cast.circle.center(),
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circle_cast.circle.radius(),
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Color::GREEN,
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);
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}
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}
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}
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fn get_intersection_position(time: &Time) -> Vec2 {
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let x = (0.8 * time.elapsed_seconds()).cos() * 250.;
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let y = (0.4 * time.elapsed_seconds()).sin() * 100.;
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Vec2::new(x, y)
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}
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fn aabb_intersection_system(
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mut gizmos: Gizmos,
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time: Res<Time>,
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mut volumes: Query<(&CurrentVolume, &mut Intersects)>,
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) {
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let center = get_intersection_position(&time);
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let aabb = Aabb2d::new(center, Vec2::splat(50.));
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gizmos.rect_2d(center, 0., aabb.half_size() * 2., Color::YELLOW);
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for (volume, mut intersects) in volumes.iter_mut() {
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let hit = match volume {
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CurrentVolume::Aabb(a) => aabb.intersects(a),
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CurrentVolume::Circle(c) => aabb.intersects(c),
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};
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**intersects = hit;
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}
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}
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fn circle_intersection_system(
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mut gizmos: Gizmos,
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time: Res<Time>,
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mut volumes: Query<(&CurrentVolume, &mut Intersects)>,
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) {
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let center = get_intersection_position(&time);
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let circle = BoundingCircle::new(center, 50.);
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gizmos.circle_2d(center, circle.radius(), Color::YELLOW);
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for (volume, mut intersects) in volumes.iter_mut() {
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let hit = match volume {
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CurrentVolume::Aabb(a) => circle.intersects(a),
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CurrentVolume::Circle(c) => circle.intersects(c),
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};
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**intersects = hit;
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}
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}
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@ -93,6 +93,7 @@ Example | Description
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Example | Description
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--- | ---
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[2D Bloom](../examples/2d/bloom_2d.rs) | Illustrates bloom post-processing in 2d
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[2D Bounding Volume Intersections](../examples/2d/bounding_2d.rs) | Showcases bounding volumes and intersection tests
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[2D Gizmos](../examples/2d/2d_gizmos.rs) | A scene showcasing 2D gizmos
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[2D Rotation](../examples/2d/rotation.rs) | Demonstrates rotating entities in 2D with quaternions
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[2D Shapes](../examples/2d/2d_shapes.rs) | Renders simple 2D primitive shapes like circles and polygons
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