Odd graphical glitches - 2013 Mac Pro

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This isn't only a problem with Mac Pro's, or anything to do with 2013, i'm having all of these problems on my 2014 iMac, i've got the later 5k model, the game breaking glitch (the top one) is fixed because of changing the undergrowth folder to "_undergrowth" there is still flat water texture glitches, the dark shade flashing every now and again, and also, i noticed a lot of objects being invisible, the physical property is there, but the image is not (possible spoiler) When you're in Theta avoiding the weird monsters, all of the gore piles? or whatever they are, weren't there, the corpses were just floating, leaning against air, there are a lot of things missing, if you watch gameplay of a fully functioning game, it looks completely different than what i saw, the shadows were screwed up, everything, that being said, the game was still amazing even with all of these problems, so bravo to the frictional gaming team. If anyone finds a temporary fix for these, please let me know.