I'm baffled by the strange artifacts showing up on a part when rendered in a model I'm working on. In Preview mode the artifacts don't show, but in Fast and Accurate modes they are there. I've tried a generic appearance with no textures, and I've tried various appearances with textures. The appearance does not make a difference. Could it be some sort of corruption of the part brought in from SolidWorks?

^ Preview mode with Brushed Aluminum appearance applied

^ Fast mode render

^ Accurate mode render