I am working on a cathode ray tube (CRT) based off of an original model. Is there a way to make a glass object (the tube) hollow? In reality, the tube is not filled with glass, so the glass shader default does not yield a good result. I have tried extruding the faces of the mesh a tiny bit inwards, but the result is that the mesh is distorted on the inside. I also tried duplicating the mesh, and scaling it down a tiny bit, but then I have to set the IOR of the shader to something really low, like 1.05. Is there a node setup, or just some kind of way to model your object so that you can render it like a thin glass tube? I would need to see the inner glass, though, like on here. enter image description here enter image description here My render.

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    $\begingroup$ Solidify modifier?? Also CRT tubes were quite thick on the front and acted quite like a lens. $\endgroup$
    – Moog
    Dec 25, 2019 at 12:19
  • $\begingroup$ Yep That sort of worked, but not very well. I'll just use that then. I'm making the first model. Not the ones in TVs $\endgroup$ Dec 25, 2019 at 12:22
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    $\begingroup$ What do you mean "sort of worked, but not very well"? Solidify is the exact solution for this problem, how much better can it get? $\endgroup$ Dec 25, 2019 at 12:39
  • $\begingroup$ I was hoping that I would be able to see some of the inner glass, but this works well enough. Thank you! $\endgroup$ Dec 25, 2019 at 12:51
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    $\begingroup$ Can you describe, why your are not seeing the "inner" of the glass and how would see it in real life photography? Images demonstrating the difference would help. $\endgroup$
    – Leander
    Dec 25, 2019 at 13:16

2 Answers 2


Perhaps something like this is closer to what you're looking for?

CRT Render

I think this is pretty close to what you've used, but feel free to check out what I've done here.

Transmission = 1

IOR = 1.05

Roughness = 0.167

  • $\begingroup$ Thank you this helps. Also is there a way to make only the inside reflective? This would be very helpful. $\endgroup$ Dec 25, 2019 at 15:44
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    $\begingroup$ Actually, adding a little bit of metallic shading fixes pretty much all of my shading problem. Thanks! $\endgroup$ Dec 25, 2019 at 15:49
  • $\begingroup$ No problem and happy holidays! $\endgroup$
    – stphnl329
    Dec 25, 2019 at 15:50

Use Cycles render with the Principled BSDF Shader with the following settings:

Roughness: 0

Transmission: 1

This will yield results show in attached.Glass Cup

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    $\begingroup$ This just gives me the same look as the glass shader. $\endgroup$ Dec 25, 2019 at 15:42
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    $\begingroup$ Ahh, it looks nothing like the render you submitted. Considering you 'fixed it' by adding metallic shading, I'm guessing you wanted to see both the inner and outer surfaces. If I remember correctly, the glass for CRTs did have a very thin metallic film/powder on them. $\endgroup$
    – Mike
    Dec 26, 2019 at 1:22

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