9bd6cc0a5e
# Objective Split up from #12017, add an aligned version of `Direction3d` for SIMD, and move direction types out of `primitives`. ## Solution Add `Direction3dA` and move direction types into a new `direction` module. --- ## Migration Guide The `Direction2d`, `Direction3d`, and `InvalidDirectionError` types have been moved out of `bevy::math::primitives`. Before: ```rust use bevy::math::primitives::Direction3d; ``` After: ```rust use bevy::math::Direction3d; ``` --------- Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
78 lines
2.1 KiB
Rust
78 lines
2.1 KiB
Rust
//! This example demonstrates how to use the `Camera::viewport_to_world` method.
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use bevy::math::Direction3d;
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use bevy::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(Update, draw_cursor)
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.run();
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}
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fn draw_cursor(
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camera_query: Query<(&Camera, &GlobalTransform)>,
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ground_query: Query<&GlobalTransform, With<Ground>>,
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windows: Query<&Window>,
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mut gizmos: Gizmos,
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) {
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let (camera, camera_transform) = camera_query.single();
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let ground = ground_query.single();
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let Some(cursor_position) = windows.single().cursor_position() else {
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return;
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};
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// Calculate a ray pointing from the camera into the world based on the cursor's position.
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let Some(ray) = camera.viewport_to_world(camera_transform, cursor_position) else {
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return;
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};
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// Calculate if and where the ray is hitting the ground plane.
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let Some(distance) = ray.intersect_plane(ground.translation(), Plane3d::new(ground.up()))
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else {
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return;
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};
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let point = ray.get_point(distance);
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// Draw a circle just above the ground plane at that position.
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gizmos.circle(
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point + ground.up() * 0.01,
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Direction3d::new_unchecked(ground.up()), // Up vector is already normalized.
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0.2,
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LegacyColor::WHITE,
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);
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}
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#[derive(Component)]
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struct Ground;
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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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// plane
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commands.spawn((
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PbrBundle {
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mesh: meshes.add(Plane3d::default().mesh().size(20., 20.)),
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material: materials.add(LegacyColor::rgb(0.3, 0.5, 0.3)),
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..default()
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},
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Ground,
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));
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// light
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commands.spawn(DirectionalLightBundle {
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transform: Transform::from_translation(Vec3::ONE).looking_at(Vec3::ZERO, Vec3::Y),
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..default()
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});
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// camera
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commands.spawn(Camera3dBundle {
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transform: Transform::from_xyz(15.0, 5.0, 15.0).looking_at(Vec3::ZERO, Vec3::Y),
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..default()
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});
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}
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