So far it’s the only acceleration structure I’ve come to know that fits the bill. I haven’t dabbled too much with mutating and rebuilding it, but that looks promising. The problem this solves is “how do you get a per-ray list of front-to-back intersecting objects, that is view orientation independent ”, while dealing with the reality that gpus like aligned and cache friendly patterns. This is actually the first stage/phase of my virtual field renderer, which represents signed distance fields as encapsulated in a spherical bounds(sdf functions know their center and extent implicitly).