I'm not sure why, but using the glass shader renders extremely dark.
I have the white set as high as it can go.
enter image description here
The room it's in is completely white, the roof being a white emission shader.

  • $\begingroup$ Not sure, try adding solidify modifier, looks kind of like freestyle is on. Double check to make sure that is off. $\endgroup$
    – icYou520
    Mar 27, 2017 at 14:36
  • $\begingroup$ Hi Josh, using the information provided in your question, answering it will be more of a guessing game, try uploading the .blend file, you'll get more accurate answers. $\endgroup$
    – Georges D
    Mar 27, 2017 at 15:34

1 Answer 1


When the Glass Shader is applied to a whole, solid object like that, it will treat the entire object as very thick, solid cube of pure glass.

Although it looks odd, what you are seeing is physically correct, if you had a big thick piece of glass like that and a dark gray environment a gray plane as the only source of reflections. It looks odd because you never see glass like that in the real world.

If you add a solidify modifier to your cube, it might look more like what you were expecting. This will make the glass look like a hollow cube (like a fish tank).

If you add more lights or an environment texture, it will start to look more realistic still.


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