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.
3d_viewport_to_world.rs:
use bevy::prelude::*;
fn main() {
App::new()
.add_plugins(DefaultPlugins)
.add_systems(Startup, setup)
.add_systems(Update, draw_cursor)
.run();
}
fn draw_cursor(
camera_query: Query<(&Camera, &GlobalTransform)>,
ground_query: Query<&GlobalTransform, With<Ground>>,
windows: Query<&Window>,
mut gizmos: Gizmos,
) {
let (camera, camera_transform) = camera_query.single();
let ground = ground_query.single();
let Some(cursor_position) = windows.single().cursor_position() else {
return;
};
let Some(ray) = camera.viewport_to_world(camera_transform, cursor_position) else {
return;
};
let Some(distance) =
ray.intersect_plane(ground.translation(), InfinitePlane3d::new(ground.up()))
else {
return;
};
let point = ray.get_point(distance);
gizmos.circle(point + ground.up() * 0.01, ground.up(), 0.2, Color::WHITE);
}
#[derive(Component)]
struct Ground;
fn setup(
mut commands: Commands,
mut meshes: ResMut<Assets<Mesh>>,
mut materials: ResMut<Assets<StandardMaterial>>,
) {
commands.spawn((
PbrBundle {
mesh: meshes.add(Plane3d::default().mesh().size(20., 20.)),
material: materials.add(Color::srgb(0.3, 0.5, 0.3)),
..default()
},
Ground,
));
commands.spawn(DirectionalLightBundle {
transform: Transform::from_translation(Vec3::ONE).looking_at(Vec3::ZERO, Vec3::Y),
..default()
});
commands.spawn(Camera3dBundle {
transform: Transform::from_xyz(15.0, 5.0, 15.0).looking_at(Vec3::ZERO, Vec3::Y),
..default()
});
}