azalea_physics::collision::world_collisions

Function for_entities_in_chunks_colliding_with

Source 
pub fn for_entities_in_chunks_colliding_with(
    world: &Instance,
    aabb: &AABB,
    consumer: impl FnMut(ChunkPos, &HashSet<Entity>),
)
Expand description

This basically gets all the chunks that an entity colliding with that bounding box could be in.

This is forEachAccessibleNonEmptySection in vanilla Minecraft because they sort entities into sections instead of just chunks. In theory this might be a performance loss for Azalea. If this ever turns out to be a bottleneck, then maybe you should try having it do that instead.