Basically, what’s happened is this… I made a self-contained Mars habitat and the outer walls were made of 6cm thick aluminium. After some more research I learned that 6cm was far too thick, so I reduced it to 3cm thick.
Now when I render it out I’ve got really ugly black lines appering on the surface, as if the inner side of the wall segment (3cm behind the outer side from the camera’s POV) is showing through towards the camera in places. See the attached screenshot (1) to see what I mean.
I’m nigh on certain this isn’t down to lighting or anything like that. I’ve had the same artifacting occur in computer games and been able to resolve it by increasing to maximum monitor resolution. Also, when I lower the camera in Blender below a certain height the problem resolves itself, again pointing to some kind of local z-plane resolution problem. See screenshot (2) to see how it looks when the camera is below a certain height.
Any help is greatly appreciated. I don’t mind going back to 6cm thick walls as a last resort but I’d rather keep the extra interior floor space if the problem can be solved by other means.
If it helps, the term “z-buffer” might be relevant. I’m not sure though.
Note that the two dark line shadows on the right hand side of screenshot 2 are intentional.