Yet strangely, all the cut scenes appear to use in-game resources. Barring the fried eggs. Because that's important. Like, really important.
I noticed some of the compression artifacts in a couple of the cut scenes, which struck me as being odd, almost to the point where I wasn't quite sure whether it was pre-rendered or not. There was only one sequence in the end that had particularly bad compression artifacts that were the telling sign that pre-rendered video was used sparingly. Of course 90% of the cut scenes aren't, most of which can be confirmed by Snake's octocamo.







