On the other hand, A Scanner Darkly was a remarkably faithful adaptation of the book, and because of PKD's daughters involvement (they recognized the book's importance to him and it weighed heavily in the creation of the movie).
He was, until he passed away. I don't know if he had any say-so in the Hobbit trilogy, though. I suspect not. He was in his 90s at the time and might not have been actively working. Now that he's gone, all bets appear to be off.
