Thieves chasm continues

The thieves chasm ran into trouble a few months ago during development because the software kept crashing due to the number of boxes involved. I considered simplifying the shot, but wasn't happy with the other flythroughs, so I've gone back to the original shot, but now will need to render different sections of the shot in separate passes and then stitch them together. Should work.. in theory. Here's a screen capture from the first set of boxes that surround the opening in the cliff. That's only a small fraction of the total size of the chasm area..