Function calculate_bounds 

pub fn calculate_bounds(
    commands: Commands<'_, '_>,
    meshes: Res<'_, Assets<Mesh>>,
    without_aabb: Query<'_, '_, (Entity, &Mesh3d), (Without<Aabb>, Without<NoFrustumCulling>)>,
)

Computes and adds an Aabb component to entities with a Mesh3d component and without a NoFrustumCulling component.

This system is used in system set VisibilitySystems::CalculateBounds.