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I've been working on a phone model for some friends, and there are strange lines that appear in the glass when I render it. I'm using Cycles. Here's an example:

enter image description here

enter image description here I think it might have something to do with the distance between the glass (which is now just the outside layer of white) and the layer below it, but it doesn't appear in the render preview... Is there anything I can do about it? It only appears in the final render.

If you need the .blend, here you go: Google Drive

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Your model has very bad topology (N-gons) and that's the problem of the artifacts in render (but you can see problems also without rendering, check my screenshot)

enter image description here

more info: What is an Ngon? If you're unfamiliar with what an ngon is let's go over a very quick review so you can understand this question a little more. An ngon is a face or polygon that is made up of five or more sides or edges connected by five or more vertices. Anything over a quad (4 sides) is considered an ngon.

More here (https://www.pluralsight.com/blog/film-games/ngons-triangles-bad) and on youtube/google if you look for ngons.

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  • $\begingroup$ I've tried to select all the n-gons in the model, turn them into triangles, and then converted them into quads, but the issue is still there for some reason.. here's a new file with all the n-gons removed drive.google.com/file/d/1rvxWQ_ssxWnth17lYzYfRFjXV-DOqFun/… $\endgroup$
    – water
    Commented Jun 20, 2020 at 15:04

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