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Refactor 3d_viewport_to_world example with let chains (#20071)

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# Objective

Make use of let chains to reduce LoC where we previously used let else
to cut down on indentation. Best of both worlds.
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Tim 2025-07-10 04:37:56 +02:00 committed by GitHub
parent c9c8964857
commit cb64a4aa8a
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1 changed files with 19 additions and 30 deletions
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49
examples/3d/3d_viewport_to_world.rs
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@ -13,41 +13,30 @@ fn main() {
fn draw_cursor( fn draw_cursor(
camera_query: Single<(&Camera, &GlobalTransform)>, camera_query: Single<(&Camera, &GlobalTransform)>,
ground: Single<&GlobalTransform, With<Ground>>, ground: Single<&GlobalTransform, With<Ground>>,
windows: Query<&Window>, window: Single<&Window>,
mut gizmos: Gizmos, mut gizmos: Gizmos,
) { ) {
let Ok(windows) = windows.single() else {
return;
};
let (camera, camera_transform) = *camera_query; let (camera, camera_transform) = *camera_query;
let Some(cursor_position) = windows.cursor_position() else { if let Some(cursor_position) = window.cursor_position()
return; // Calculate a ray pointing from the camera into the world based on the cursor's position.
}; && let Ok(ray) = camera.viewport_to_world(camera_transform, cursor_position)
// Calculate if and at what distance the ray is hitting the ground plane.
&& let Some(distance) =
ray.intersect_plane(ground.translation(), InfinitePlane3d::new(ground.up()))
{
let point = ray.get_point(distance);
// Calculate a ray pointing from the camera into the world based on the cursor's position. // Draw a circle just above the ground plane at that position.
let Ok(ray) = camera.viewport_to_world(camera_transform, cursor_position) else { gizmos.circle(
return; Isometry3d::new(
}; point + ground.up() * 0.01,
Quat::from_rotation_arc(Vec3::Z, ground.up().as_vec3()),
// Calculate if and where the ray is hitting the ground plane. ),
let Some(distance) = 0.2,
ray.intersect_plane(ground.translation(), InfinitePlane3d::new(ground.up())) Color::WHITE,
else { );
return; }
};
let point = ray.get_point(distance);
// Draw a circle just above the ground plane at that position.
gizmos.circle(
Isometry3d::new(
point + ground.up() * 0.01,
Quat::from_rotation_arc(Vec3::Z, ground.up().as_vec3()),
),
0.2,
Color::WHITE,
);
} }
#[derive(Component)] #[derive(Component)]