Hi!
I’m absolute beginner so, please, be patient if my question is dumb 
I have model exported from blender. It’s ok there and even ‘paint 3d’ displaying everything right.
But, after importing in ‘Unity’ some areas become invisible/zero collision. Like this
And whith texture it’s a mess…
What can I do to fix it?
your problem is probably in how you unwrapped it of exported from blender. First make sure it is unwrapped and then export it as wavefront obj these are the export settings I usually use.
Thanks, but didn’t helped. It’s looks like texture applied to the inside of the model, not to the surface… Maybe some setting controlling it?
Looks like your normals are inverted. I’d try swapping them and see if that fixes it.
