Lightfields are great, but adding the angular dependence makes them storage expensive, hence the extremely restricted movement from the demos. They're created u

Lightfields are great, but adding the angular dependence makes them storage expensive, hence the extremely restricted movement from the demos. They're created using photogrametric techniques as well, so in theory I don't see why you can't just take more photos and solve for more angles (but this is very much a load bearing "just"). In practice storing a full BSDF per point is always going to impractical, but I believe that's pretty much exactly the problems that NeRFs have been created to address.