I also had alot of problems with the DAE files, so I investigated a little on my own, and since of course I'm not much of a programmer, I don't really know if what I suspect is correct, mainly that DAE assigns most textures as two sided. Is this correct? When I "fixed" google dae , I always reversed the faces and made sure both faces had the same texture. I don't know if this was accurate, but it seemed to work. But I am trying out the new version, and would bow to you as a god if this new version makes trees and plants easier to import.
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