I’m having problems with a reflecting material. The reflection shows off checker-texture for no apparent reason, see the image. there should be nothing in the environment that causes this and I’ve played around with the reflection settings but have found no fix.
The reflective model is a simple thin cube, simulating a window glass or similar. There are no edges where the checker thing appears and no subdiv surface modifier. Adding edges does make the texture smaller but it is still there. What could be causing this?