http://www.cartoonbrew.com/vfx/cg-actors-logan-never-knew-149013.html [cartoonbrew.com]
A long article going into great detail about how they staged, shot & digitally manipulated scenes in the movie Logan replacing the faces on stuntmen with the respective actor. When I watched the movie, I knew that X-24 had been de-aged and touched up a bit, but I never noticed any of the other scenes, in particular the Limo scene they describe in the article that was heavily modified.
Of particular note, their lighting software is open source.