Objects imported from Rhinoceros missing

Hi,

I created a model of the International Space Station and when I exported it in .OBJ, in Unity I found out that some parts of it were missing - solar panels. I made them into blocks (instead of planes), but they are still not visible from one side (as you can see on pictures). I would really appreciate any help, thank you :slight_smile:

Ok, I’m not sure I did what you suggested, but it worked…

For anyone who could have the same problem, I used Dir on groups of my surfaces and flipped them all.