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Under the Cycles Render, I inserted a pyramid with the emission material attached to it and it is inside the octagonal shape glass. When I am rendering the scene, the pyramid weirdly is being displayed as seen in the image and this appears to be happening on the edges of the shape. How do I fix this?

Jack232
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    Does the glass have any thickness? –  Feb 03 '18 at 06:19
  • How do I check the glass's material thickness? – Jack232 Feb 03 '18 at 07:06
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    if you didn't design it as a glass cover, like a lantern glass, having just some thickness, then it's a bulk object full of glass material... it will for sure behave different. – m.ardito Feb 03 '18 at 08:41
  • Sorry I am not too sure what you mean. Could you please give me a demonstration as to what I have to do to solve such an issue please?

    What I did was that I created a octagonal shape and then I added a glass material to it. What am I supposed to be doing in order to avoid such an issue?

     – Jack232 Feb 03 '18 at 12:23
  • Read this related post: https://blender.stackexchange.com/a/69616/1853 –  Feb 03 '18 at 19:19

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The problem you are having is that if you set no thickness to the glass then your object becomes a solid piece of glass:

enter image description here

If you give the glass some thickness (in this example I used a solidify modifier) then it will behave like an object that has glass panes, but is empty inside.

enter image description here

But the problem is not solved, because the default glass shader has problems dealing with direct light going through it.

Using the tricky glass shader detailed in this post: How to illuminate the darkness inside glass objects in Cycles? will give you more realistic results.

enter image description here