Ray cast goes through collider without hit

[daBlesr]

Hello,

I have been trying to check if an entity is visible or is blocked by a structure by casting a ray.

if let Some(hits) = spatial_query.cast_ray(
    eyes_pos,
    Dir3::new(target_pos - eyes_pos).unwrap_or(Dir3::NEG_Z),
    15.0,
    true,
    &SpatialQueryFilter::default()
            .with_excluded_entities([archer_entity])
            .with_mask([Layer::Structure, Layer::Player]),
) {
    println!("hit entities {:?}",  name_query.get(hits.entity));
}

However, the ray goes through the wall and has a hit with the other archer.

How I set up my wall:

commands.spawn((
    Structure,
    Name::new("Wall"),
    SceneRoot(wall_model.0.clone()),
    Transform::from_translation(*loc)
        .with_rotation(Quat::from_axis_angle(Vec3::Y, PI / 2.0)),
    RigidBody::Static,
    CollisionMargin(0.1),
    SweptCcd::default(),
    // Collider::cuboid(1.0, 2.0, 1.0),
    ColliderConstructorHierarchy::new(ColliderConstructor::ConvexDecompositionFromMesh),
    CollisionLayers::new(Layer::Structure, LayerMask::ALL),
));

If use Collider::cuboid(1.0, 2.0, 1.0), it does have an intersection with the ray. But I am importing a scene from blender with many objects so I can't create a custom primitive for each entity.

I have also tried all possible ColliderConstructors from Meshes, TrimeshFromMesh, ColliderConstructor::VoxelizedTrimeshFromMesh { voxel_size: 0.1, fill_mode: FillMode::SurfaceOnly }), with different settings and none worked. Even ColliderConstructorHierarchy::new(ColliderConstructor::VoxelizedTrimeshFromMesh { voxel_size: 0.3, fill_mode: FillMode::FloodFill { detect_cavities: false} }) does not detect ray casts even though the collission looks perfectly abstracted to me.

I have also tried spatial_query.cast_shape with small and large spheres and spatial_query.shape_intersections with a a long capsule from eye to eye through the wall, and I have also checked directly if the structure it self is on a ray by using collider.intersects_ray. None of these return an intersection with the wall.

Important note, if I shoot an arrow however at wall, the wall does block the arrow, see video.

Schermopname.2026-02-05.om.10.50.29.mov

[daBlesr]

I added a minimal reproducible example here: https://github.com/daBlesr/ray-cast-bug

[Jondolf]

The scene spawns a hierarchy of entities with their own colliders, but CollisionLayers::new(Layer::Structure, LayerMask::ALL) is only on the scene root, not on the actual colliders.

I didn't have time to test this with your reproduction yet, but this should hopefully work:

ColliderConstructorHierarchy::new(ColliderConstructor::ConvexDecompositionFromMesh)
    .with_default_layers(CollisionLayers::new(Layer::Structure, LayerMask::ALL))

[daBlesr]

@Jondolf indeed this works, thank you. I want to highlight however that in the reproducible example I am not using any layers ;) , and the showcased problem still persists, but it depends on the ColliderConstruction method used. with ConvexDecompositionFromMesh there is a ray cast hit, but with VoxelizedTrimeshFromMesh there is not.