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Glass reflects the window itself

In my small project, I was following the official documentation for glass material. But in the result, in the glass's reflection, you can see the glass and the window itself, which would make no sense at all.

Here is the screen shot: alt text

Product Version: UE 4.20
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kepkivagas.jpg (123.1 kB)
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asked Oct 21 '18 at 01:28 PM in Rendering

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CrimsonHawk
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avatar image Chris.Kiser Oct 25 '18 at 11:58 PM

Can you share a screenshot of your reflection capture probe locations? If you are only using 1 probe for the whole scene it could be causing this issue.

avatar image CrimsonHawk Oct 27 '18 at 11:18 AM

Actually, I'm not using any. I haven't heard about them before. But based on your response that's something I should learn more about!

avatar image CrimsonHawk Nov 01 '18 at 11:09 AM

After trying to set it up, what I experienced is that adding reflection capture probes don't solve this, but add a new layer of reflection that is a correct one, but this strange artifact still stays.

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2 answers: sort voted first

That looks like refraction not reflection. You'll want to mess with Refraction Depth Bias if that's the case.

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answered Oct 24 '18 at 03:51 AM

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Buzzooo2
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avatar image CrimsonHawk Oct 24 '18 at 07:32 PM

I checked it, all it does, is cut off a part of the second "border" that's not there. In this next picture there is a corridor on the first floor made out of glass. It is supposed to Reflect the windows on the wall, but instead all it does is copy it's surroundings and transform it a little.

alt text

kepkivagas.jpg (148.3 kB)
avatar image Buzzooo2 Oct 25 '18 at 05:19 PM

That still looks like refraction causing that. Reflections would not behave like that for any reason unless you just had a weird reflection capture in that area. What do your material setup and settings look like?

avatar image CrimsonHawk Oct 27 '18 at 11:21 AM

Just very basic stuff, copied from the documentation, nothing fancy. alt text

kepkivagas.jpg (156.9 kB)
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I have experienced really weird tearing like this with glass in unreal myself. I ended up following this tutorial to create a much more custom glass shader that allowed me to control the reflection and refraction much more to fix the reflection/refraction tearing

https://www.youtube.com/watch?v=lZ2o-NEdJhw

Also check your reflection probe locations and size

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answered Oct 26 '18 at 12:02 AM

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Chris.Kiser
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