scene_queries_intersection_test

Intersection tests will find all the colliders with a shape intersecting a given shape. This can be useful for, e.g., selecting all the objects that intersect a given area. There are two kind of intersection tests:

• The exact intersection test RapierContext::intersections_with_shape searches for all the colliders with shapes intersecting the given shape.
• The approximate intersection test RapierContext::colliders_with_aabb_intersecting_aabb searches for all the colliders with an AABB intersecting the given AABB. This does not check if the actual shapes of these colliders intersect the AABB.

info

See the ray-casting section for details about intersection tests between a ray and the colliders on the scene. And see the point projection section for details about the intersection test between the colliders and a point.

Example 2D

/* Test intersections inside of a system. */
fn test_intersections(rapier_context: Res<RapierContext>) {
    let shape = Collider::cuboid(1.0, 2.0);
    let shape_pos = Vec2::new(0.0, 1.0);
    let shape_rot = 0.8;
    let filter = QueryFilter::default();

    rapier_context.intersections_with_shape(shape_pos, shape_rot, &shape, filter, |entity| {
        println!("The entity {:?} intersects our shape.", entity);
        true // Return `false` instead if we want to stop searching for other colliders that contain this point.
    });

    let aabb = Aabb::from_min_max(Vec3::new(-1.0, -2.0, 0.0), Vec3::new(1.0, 2.0, 0.0));
    rapier_context.colliders_with_aabb_intersecting_aabb(aabb, |entity| {
        println!(
            "The entity {:?} has an AABB intersecting our test AABB",
            entity
        );
        true // Return `false` instead if we want to stop searching for other colliders that contain this point.
    });
}

Example 3D

/* Test intersections inside of a system. */
fn test_intersections(rapier_context: Res<RapierContext>) {
    let shape = Collider::cuboid(1.0, 2.0, 3.0);
    let shape_pos = Vec3::new(0.0, 1.0, 2.0);
    let shape_rot = Quat::from_rotation_z(0.8);
    let filter = QueryFilter::default();

    rapier_context.intersections_with_shape(shape_pos, shape_rot, &shape, filter, |entity| {
        println!("The entity {:?} intersects our shape.", entity);
        true // Return `false` instead if we want to stop searching for other colliders that contain this point.
    });

    let aabb = Aabb::from_min_max(Vec3::new(-1.0, -2.0, -3.0), Vec3::new(1.0, 2.0, 3.0));
    rapier_context.colliders_with_aabb_intersecting_aabb(aabb, |entity| {
        println!(
            "The entity {:?} has an AABB intersecting our test AABB",
            entity
        );
        true // Return `false` instead if we want to stop searching for other colliders that contain this point.
    });
}

It is possible to only apply the scene query to a subsets of the colliders using a query filter