Light Inside Glass Checkered

Development Rendering
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1

I have an emissive ring inside a glass ring. When I put one inside the other, I get a checkered pattern on the emissive ring. What does this mean? How to solve?

332996-lightinglass.jpg
332996-lightinglass.jpg2717×1873 870 KB

2

Have you tried changing all your texture sample setting in Material Editor: sampler sourse→shared:warp

3

Thanks for the suggestion, tried but didn’t help.