x

Cargo.toml

@@ -279,6 +279,16 @@ description = "Simple 3D scene with basic shapes and lighting"
 category = "3D Rendering"
 wasm = true
 
+[[example]]
+name = "3d_viewport_to_world"
+path = "examples/3d/3d_viewport_to_world.rs"
+
+[package.metadata.example.3d_viewport_to_world]
+name = "3D Viewport To World"
+description = "Use the cursor to move a cube through the scene"
+category = "3D Rendering"
+wasm = true
+
 [[example]]
 name = "3d_shapes"
 path = "examples/3d/3d_shapes.rs"

examples/3d/3d_viewport_to_world.rs

@@ -0,0 +1,95 @@
+use bevy::prelude::*;
+
+fn main() {
+ App::new()
+ .add_plugins(DefaultPlugins)
+ .add_startup_system(setup)
+ .add_system(move_cube)
+ .run();
+}
+
+fn move_cube(
+ camera_query: Query<(&Camera, &GlobalTransform)>,
+ mut cube_query: Query<&mut Transform, With<Cube>>,
+ windows: Res<Windows>,
+ input: Res<Input<MouseButton>>,
+) {
+ let (camera, camera_transform) = camera_query.single();
+ let mut transform = cube_query.single_mut();
+
+ if !input.pressed(MouseButton::Left) {
+ return;
+ }
+
+ let Some(cursor_position) = windows.primary().cursor_position() else { return; };
+
+ let Some(ray) = camera.viewport_to_world(camera_transform, cursor_position) else { return; };
+
+ let Some(distance) = ray.intersect_plane(Vec3::ZERO, Vec3::Y) else { return; };
+
+ let point = ray.get_point(distance);
+ transform.translation = point + Vec3::Y * 0.5;
+}
+
+#[derive(Component)]
+struct Cube;
+
+fn setup(
+ mut commands: Commands,
+ mut meshes: ResMut<Assets<Mesh>>,
+ mut materials: ResMut<Assets<StandardMaterial>>,
+ asset_server: Res<AssetServer>,
+) {
+ // plane
+ commands.spawn(PbrBundle {
+ mesh: meshes.add(Mesh::from(shape::Plane { size: 50.0 })),
+ material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
+ ..default()
+ });
+
+ // cube
+ commands
+ .spawn(PbrBundle {
+ mesh: meshes.add(Mesh::from(shape::Cube { size: 1.0 })),
+ material: materials.add(Color::rgb(0.8, 0.7, 0.6).into()),
+ transform: Transform::from_xyz(0.0, 0.5, 0.0),
+ ..default()
+ })
+ .insert(Cube);
+
+ // light
+ const HALF_SIZE: f32 = 15.0;
+ commands.spawn(DirectionalLightBundle {
+ transform: Transform::from_translation(Vec3::ONE).looking_at(Vec3::ZERO, Vec3::Y),
+ directional_light: DirectionalLight {
+ shadows_enabled: true,
+ shadow_projection: OrthographicProjection {
+ left: -HALF_SIZE,
+ right: HALF_SIZE,
+ bottom: -HALF_SIZE,
+ top: HALF_SIZE,
+ near: -10.0 * HALF_SIZE,
+ far: 10.0 * HALF_SIZE,
+ ..default()
+ },
+ ..default()
+ },
+ ..default()
+ });
+
+ // camera
+ commands.spawn(Camera3dBundle {
+ transform: Transform::from_xyz(0.0, 6.0, 6.0).looking_at(Vec3::ZERO, Vec3::Y),
+ ..default()
+ });
+
+ // UI
+ commands.spawn(TextBundle::from_section(
+ "Press the left mouse button to reposition the box.",
+ TextStyle {
+ font: asset_server.load("fonts/FiraMono-Medium.ttf"),
+ font_size: 32.,
+ ..default()
+ },
+ ));
+}