I'm currently following Blender Guru's beginner donut tutorial and I just completed Level 3 Part 4 where we made coffee, but for some reason, the liquid as viewed from the outside of the glass looks strange. Here’s the picture of the render: Coffee Maybe this is what it is supposed to look like, but please tell me how to fix this if this is wrong. Thank you!

By the way, I am using the Blender 2.8 default denoiser with 128 samples and the Filmic Blender configuration that Blender Guru recommended.

  • 1
    $\begingroup$ Do you mean the muddy pattern? That is caused by the denoiser not being able to properly eliminate the noise. $\endgroup$
    – Robert Gützkow
    Oct 7, 2019 at 10:42
  • $\begingroup$ I would suggest a good step would be to render the coffee without the glass, to see if the root problem is about the interaction between the refractive surfaces. $\endgroup$
    – Robin Betts
    Oct 7, 2019 at 20:41

1 Answer 1


Did you do the part where you slightly scaled up the liquid so it overlapped the glass a little bit? That's what it looks like to me.

  • $\begingroup$ Yes, I did that, but I still have the problem :( $\endgroup$
    – crxyz
    Jun 27, 2021 at 21:29

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