Support Warning
WebGPU is currently only supported on Chrome starting with version 113, and only on desktop. If they don't work on your configuration, you can check the WebGL2 examples here.cubic_curve.rs:
//! Demonstrates how to work with Cubic curves.
use bevy::{
color::palettes::css::{ORANGE, SILVER, WHITE},
math::vec3,
prelude::*,
};
#[derive(Component)]
struct Curve(CubicCurve<Vec3>);
fn main() {
App::new()
.add_plugins(DefaultPlugins)
.add_systems(Startup, setup)
.add_systems(Update, animate_cube)
.run();
}
fn setup(
mut commands: Commands,
mut meshes: ResMut<Assets<Mesh>>,
mut materials: ResMut<Assets<StandardMaterial>>,
) {
// Define your control points
// These points will define the curve
// You can learn more about bezier curves here
// https://en.wikipedia.org/wiki/B%C3%A9zier_curve
let points = [[
vec3(-6., 2., 0.),
vec3(12., 8., 0.),
vec3(-12., 8., 0.),
vec3(6., 2., 0.),
]];
// Make a CubicCurve
let bezier = CubicBezier::new(points).to_curve();
// Spawning a cube to experiment on
commands.spawn((
PbrBundle {
mesh: meshes.add(Cuboid::default()),
material: materials.add(Color::from(ORANGE)),
transform: Transform::from_translation(points[0][0]),
..default()
},
Curve(bezier),
));
// Some light to see something
commands.spawn(PointLightBundle {
point_light: PointLight {
shadows_enabled: true,
intensity: 10_000_000.,
range: 100.0,
..default()
},
transform: Transform::from_xyz(8., 16., 8.),
..default()
});
// ground plane
commands.spawn(PbrBundle {
mesh: meshes.add(Plane3d::default().mesh().size(50., 50.)),
material: materials.add(Color::from(SILVER)),
..default()
});
// The camera
commands.spawn(Camera3dBundle {
transform: Transform::from_xyz(0., 6., 12.).looking_at(Vec3::new(0., 3., 0.), Vec3::Y),
..default()
});
}
fn animate_cube(time: Res<Time>, mut query: Query<(&mut Transform, &Curve)>, mut gizmos: Gizmos) {
let t = (time.elapsed_seconds().sin() + 1.) / 2.;
for (mut transform, cubic_curve) in &mut query {
// Draw the curve
gizmos.linestrip(cubic_curve.0.iter_positions(50), WHITE);
// position takes a point from the curve where 0 is the initial point
// and 1 is the last point
transform.translation = cubic_curve.0.position(t);
}
}