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I've followed all the tutorials, tried so many different things. But changing the transmission to 1 just makes the shape go grey. I've turned on refraction in the light settings and nothing has changed.
You need to turn on the Screen Space Refraction both in the Render panel
and in the Material settings
I generally use a Glass Shader and a Transparent Shader. Then use a Mix Shader to join them before giving the Material Output.
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