Today I went back to a model to tweak the materials. I added HDRI lighting. I’m seeing strange artefacts on the wheel on the left. There are very obvious sharp edges for some reason (Circled in the picture below). I’ve also included screen shots of the material node set-up as well as the world node set-up. I’ve tried two HDR images with the same results. If I look at the model front on, the hard edges are pretty much perfectly at 90 degrees going around the wheel. Any clues as to what might be happening here?