I was rendering a motorcycle model I picked up somewhere* and I noticed a problem with rendering in parts - this is 242a. You can see I hope in the attached image there is a difference in colour between the lower corner parts and the ones above ie the disk brakes have a line through them where the parts join. Seems like a bug where adjacent parts are not evaluated correctly…anyone else seen similar things?
*edit to give proper credit I see the model is by ‘varuag’ from India
Well I found the problem and the answer is it is a weird coincidence and unlucky combination of scene set up and viewpoint producing an illusion. The lighting, materials, background and renderer are not in themselves at fault in this case - the camera does not lie - it is just the circumstance. I changed things a little and the issue was avoided. Apologies for a false alarm. Sure had me fooled. Thanks to those who stopped to offer assistance