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I'm using Glass nodes from Blender Gurus tutorial but for some reason I get this strange sphere in all my glass surfaces. If I Enable Backface Culling in material settings, the sphere disappears from Viewport reflections but still shows in final renders.

Here is the node setup and a screenshot of the artifact:

enter image description here

enter image description here

How can I get rid of it?

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  • $\begingroup$ which tutorial? $\endgroup$
    – ETHAN DAY
    Commented Apr 19, 2021 at 20:03
  • $\begingroup$ @ETHANDAY youtu.be/KyXRBu7gn2o?t=300 $\endgroup$
    – lauriinc
    Commented Apr 19, 2021 at 20:05
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    $\begingroup$ It's a result of the insanely high Fresnel value he uses for this "hack". Change the Fresnel and you'll see the sphere change size. $\endgroup$
    – Christopher Bennett
    Commented Apr 19, 2021 at 20:18
  • $\begingroup$ Hmm okay.. But when I change the Fresnel to small it's not transparent anymore as all I get is reflections. I guess I need to find a new glass material :) $\endgroup$
    – lauriinc
    Commented Apr 19, 2021 at 20:23
  • $\begingroup$ Yeah. Keep in mind he uses this for a very special-use case. If your scene doesn't need it, there are other options. $\endgroup$
    – Christopher Bennett
    Commented Apr 19, 2021 at 20:31

2 Answers 2

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As Christopher suggested in the comments, this glass hack has too high Fresnel value that is causing the issue. I'll use a different glass node setup.

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I recommend a simplified setup:

enter image description here

You can use the Value of the Transparent BSDF to control the amount of shadow.

enter image description here

I have a more in-depth answer to this question that may help as well.

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  • $\begingroup$ Thanks Allen, I actually ended up with the same nodes and it seems to work great! The only thing I could not achieve with this new setup is to make it transparent and reflective in Viewport Shading mode as I was able to do it with the previous setup above. Any suggestions on this? I work a lot in the Shading mode and not seeing anything through the windows makes it hard to work on scenes. $\endgroup$
    – lauriinc
    Commented Apr 20, 2021 at 7:08

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