When I try to render a glass material, in rendered view it looks good, but when rendered, I get this wavy effect and black outlines.

enter image description here enter image description here

Polygon detail:

enter image description here

The scene is just a glass object with a glass material, background with a texture with a Diffuse shader and a lighting setup of two plane emissions.

  • Glass: 4 levels of subdivision surface modifier.

  • Background: 4 levels of subdivision surface modifier.

  • 2 plane emissions, with no modifiers.

  • 80 samples.

What is causing that and how can I fix it?

Here's the file if anybody wants to explore it.


1 Answer 1


The subsurf modifier on the glass object is disabled in the render.

Make sure the camera icon the subsurf modifier is selected:

enter image description here

  • $\begingroup$ Thanks for the answer. The icon is selected, but the object renders as if it is not. I get the same result when I uncheck it, It renders as a low poly object regardless of the icon setting, pretty weird. $\endgroup$
    – Vladimir
    Oct 11, 2014 at 21:48
  • 1
    $\begingroup$ @Vladimir It's not selected at all for me in your file, but selecting it fixes it just fine.. Are you sure you have the right object selected? $\endgroup$
    – gandalf3
    Oct 11, 2014 at 21:50
  • $\begingroup$ Yeah, I just saw that. I selected the background instead, my mistake. Thanks. $\endgroup$
    – Vladimir
    Oct 11, 2014 at 21:52

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