This is an obj I made from a dwg file and imported into Maya. My solution has just been to remodel the roof, but there must be something that is actually causing it. And in future to save remodelling, I'd like to find out what!
- I have checked the normals and to my untrained eye they look okay. I have tried 'set to face', 'reverse' pretty much everything you'd normally do to no avail.
- It's a simple planar UV map on the object, works fine on all other objects
- when rendered in Maya software with a checkered lambert, the same roof object renders fine, no blurring.