I am a fresh newbie in Blender. I watched lots of tutorials from Blender Guru, and wanted to make a potion bottle. I don't know what went wrong, but the shading went completely wrong, and for some reason the main spehere doesn't reflect anything. If anyone knows why, please help me!

I used a glass material, mixed with diffuse for the bottle.

enter image description here


2 Answers 2


The dark areas are normals facing the wrong direction. Fix these by selecting everything A in edit mode and pressing Ctrl+N.

To fix refraction issues, add a solidify modifier to the mesh. You might have to adjust the thicker part on the top. The glass shader is trying to guess where the glass is solid, so you should use it on closed meshes only for the refraction to work correctly.

For tinting glass, use a volume shader in the volume material output instead of mixing the surface with a diffuse shader.


Maybe try principled shader. It will be more... correct. With fresnel effect working you might see big reflections on the edges, just as in real world. Plug that straight into surface output and set transmission to 1, roughness to 0. Btw I am not sure if default IOR is correct for glass.

  • $\begingroup$ He is using 2.78, which did not have Principled Shader $\endgroup$ Sep 2, 2017 at 15:43
  • $\begingroup$ Oh, ok then maybe he should download a newer version, he doesn't lose anything $\endgroup$ Sep 2, 2017 at 15:52
  • $\begingroup$ Somebody down voted our answers :( $\endgroup$ Sep 2, 2017 at 16:02
  • $\begingroup$ I am new to this website, I thought down voting is only necessary if someone's answer is insulting or something, not when someone tries to find a solution and doesn't succeed. $\endgroup$ Sep 2, 2017 at 16:15
  • 1
    $\begingroup$ This is probably downvoted because while the principled shader might improve the result, the problem can be completely fixed with the current stable version. The down vote is justified in my opinion, because the provided solution is not recommended for most users (who do not want to update to releases labeled as potentially unstable). However it would have been really helpful to explain the reason after downvoting. $\endgroup$
    – Cebbi
    Sep 2, 2017 at 16:25

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