GKvfx said:
On our (VIFX's) part, there was very little CGI per se, though we were digitally compositing the plates that we shot on (gasp!) film.
They built an Engine Room set down in Mexico, but it only went so far back into the guts of the machinery. For the wide shots we had this miniature to use as either a BG plate that was tracked in to extend the rest of the practical set. Or we used this miniature as the main plate and then tracked in a GS plate of crewmen that we shot that lined up with the catwalks of the miniature. There's a couple of wide, sweeping shots that show off the machinery quite well - that's the miniature. For the shot of the reversing gear engaging, it's the miniature as well.
For some of the closeups of the pistons moving up/down (there is a crewman oiling one of them) - that stuff was filmed on the Jeremiah O'Brien with 1/3 scale catwalks, lights, and details added to the real ship. The JO'B wasn't the same class of ship (obviously), but it had three screws and with the details added, it was deemed close enough for the closeups.
But there was NO computer model built of the thing. Hell, I don't think they even used a laser cutter on it..........
Gene