Struct bevy::prelude::Ray3d

pub struct Ray3d {
    pub origin: Vec3,
    pub direction: Dir3,
}

An infinite half-line starting at origin and going in direction in 3D space.

Fields

origin: Vec3

The origin of the ray.

direction: Dir3

The direction of the ray.

Implementations

impl Ray3d

pub fn new(origin: Vec3, direction: Vec3) -> Ray3d

Create a new Ray3d from a given origin and direction

Panics

Panics if the given direction is zero (or very close to zero), or non-finite.

pub fn get_point(&self, distance: f32) -> Vec3

Get a point at a given distance along the ray

Examples found in repository

examples/3d/3d_viewport_to_world.rs (line 37)

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;
    };

    // Calculate a ray pointing from the camera into the world based on the cursor's position.
    let Some(ray) = camera.viewport_to_world(camera_transform, cursor_position) else {
        return;
    };

    // Calculate if and where the ray is hitting the ground plane.
    let Some(distance) =
        ray.intersect_plane(ground.translation(), InfinitePlane3d::new(ground.up()))
    else {
        return;
    };
    let point = ray.get_point(distance);

    // Draw a circle just above the ground plane at that position.
    gizmos.circle(point + ground.up() * 0.01, ground.up(), 0.2, Color::WHITE);
}

pub fn intersect_plane( &self, plane_origin: Vec3, plane: InfinitePlane3d ) -> Option<f32>

Get the distance to a plane if the ray intersects it

Examples found in repository

examples/3d/3d_viewport_to_world.rs (line 33)

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;
    };

    // Calculate a ray pointing from the camera into the world based on the cursor's position.
    let Some(ray) = camera.viewport_to_world(camera_transform, cursor_position) else {
        return;
    };

    // Calculate if and where the ray is hitting the ground plane.
    let Some(distance) =
        ray.intersect_plane(ground.translation(), InfinitePlane3d::new(ground.up()))
    else {
        return;
    };
    let point = ray.get_point(distance);

    // Draw a circle just above the ground plane at that position.
    gizmos.circle(point + ground.up() * 0.01, ground.up(), 0.2, Color::WHITE);
}

examples/3d/irradiance_volumes.rs (line 502)

fn handle_mouse_clicks(
    buttons: Res<ButtonInput<MouseButton>>,
    windows: Query<&Window, With<PrimaryWindow>>,
    cameras: Query<(&Camera, &GlobalTransform)>,
    mut main_objects: Query<&mut Transform, With<MainObject>>,
) {
    if !buttons.pressed(MouseButton::Left) {
        return;
    }
    let Some(mouse_position) = windows
        .iter()
        .next()
        .and_then(|window| window.cursor_position())
    else {
        return;
    };
    let Some((camera, camera_transform)) = cameras.iter().next() else {
        return;
    };

    // Figure out where the user clicked on the plane.
    let Some(ray) = camera.viewport_to_world(camera_transform, mouse_position) else {
        return;
    };
    let Some(ray_distance) = ray.intersect_plane(Vec3::ZERO, InfinitePlane3d::new(Vec3::Y)) else {
        return;
    };
    let plane_intersection = ray.origin + ray.direction.normalize() * ray_distance;

    // Move all the main objeccts.
    for mut transform in main_objects.iter_mut() {
        transform.translation = vec3(
            plane_intersection.x,
            transform.translation.y,
            plane_intersection.z,
        );
    }
}

Trait Implementations

impl Clone for Ray3d

fn clone(&self) -> Ray3d

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Ray3d

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Ray3d

fn deserialize<__D>( __deserializer: __D ) -> Result<Ray3d, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Ray3d

fn eq(&self, other: &Ray3d) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Ray3d

fn serialize<__S>( &self, __serializer: __S ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for Ray3d

impl StructuralPartialEq for Ray3d