that said... there is a big problem of connection with the digital look of scenes in the film, more than 10 sfx offices worked on it, and didn't look to repect the same visual line and style... the result is mixed between what the director wanted and what sfx guys done, and probably wanted to see on screen too...

once done on the set, the all cgi crew will have for mission to past the actors on the digital world, to cut out the blue screen, to add digital light, the all climatic effects, the reflection...3d compositing and 2D ones, to add the all sound (only voices reccorded on set) ect... a titant work and maybe the only purpose to see it, to respect the time and work done... its certainly a film you go to see for the process.

the second point is for director to be closer of his actors, to work on their emotions without any outside distrubtion ...

but, the vision of what will be past behind, has to be well explain them...  they'll have to imagine everthing around and to react in front of unreal, unphysical events or characters...

here Law going out of his "half polly plane".

no need to get one real seize, it will be fix after, so, the good thing with blue screen is to save time and to have a law budget for shooting, then tranferted to post... and well re-invested.