enter image description hereI am following Blender Guru's donut & teacup tutorial and have gotten up to part 3 level 3 where I am starting to make my teacup transparent. After following all the steps in the video I am left with a glass material different from his. It is darker in some spots and has weird squiggly lines. Here are the render, material settings, and light path settings respectively. Could somebody please help me fix this?


Material settings

Light path settings

Above in the render, the dark parts I'm talking about are where it suddenly goes from pink to very dark pink. This is also where you can find the weird squiggly imperfections.


  • $\begingroup$ hello, maybe it has to do with your topology? please share your file: pasteall.org/blend $\endgroup$
    – moonboots
    Sep 17, 2021 at 6:07
  • $\begingroup$ Here is my file <img src="https://blend-exchange.com/embedImage.png?bid=9lo1kNRp" /> $\endgroup$
    – Matthew
    Sep 17, 2021 at 6:29
  • 1
    $\begingroup$ could you please highlight the parts you're talking about? the handle has edge creases, to remove them, select all and Ctrl E > Edge Crease and in the Operator box, lower it down to 0 $\endgroup$
    – moonboots
    Sep 17, 2021 at 6:58
  • $\begingroup$ Yeah ok I'll edit the post including a photo that shows where I'm talking about $\endgroup$
    – Matthew
    Sep 17, 2021 at 7:22
  • 2
    $\begingroup$ the squigglies are denoiser artifacts $\endgroup$ Sep 17, 2021 at 7:39

1 Answer 1


Edge Crease makes the edges sharp when used with Subdivision Surface.

What I did was select a few edge loops in different places and X -> Dissolve Edges. On most of the remaining geometry I removed the creases.

With the reduced geometry it's easier to place and rotate a few control loops and let Subdivision Surface fill in everything between.

enter image description here

enter image description here

If you turn Clamping -> Indirect Light and Caustics -> Filter Glossy to 0 it'll stop the glass from darkening your scene so much, but the scene will take some time to clean up the noise. With the viewport denoiser on it looks like this at 128 samples.

enter image description here

  • $\begingroup$ Thank you, you're an absolute legend. Now that I have fixed it could you please briefly explain what changing these lighting settings did, I'm a newbie to Blender and I want to fully understand every step I take. Thanks again. $\endgroup$
    – Matthew
    Sep 17, 2021 at 22:08
  • $\begingroup$ I have an answer with some comparisons, but basically it's clamping the light being added to the scene when the ray passes through something. blender.stackexchange.com/questions/219303/… $\endgroup$ Sep 17, 2021 at 22:27
  • $\begingroup$ @Matthew If this answer was helpful, be sure to upvote, and if it solved your problem to accept as well :) $\endgroup$
    – Joachim
    Jul 14 at 8:57

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