How to properly export .obj model for Xcode?

Question

Apple Xcode

I'm trying to export a model from cinema 4d in .obj format for further use in xcode. I add the model to the project, but in the scene in Xcode it feels like it is transparent (you can select it, but even when you change the background it is not visible). I downloaded another random file on the Internet, added it to the scenes and everything is fine with it. What points should be taken into account when exporting?