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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?

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    $\begingroup$ Does the glass have any thickness? $\endgroup$ – cegaton Feb 3 '18 at 6:19
  • $\begingroup$ How do I check the glass's material thickness? $\endgroup$ – Jack232 Feb 3 '18 at 7:06
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    $\begingroup$ 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. $\endgroup$ – m.ardito Feb 3 '18 at 8:41
  • $\begingroup$ 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? $\endgroup$ – Jack232 Feb 3 '18 at 12:23
  • $\begingroup$ Read this related post: blender.stackexchange.com/a/69616/1853 $\endgroup$ – cegaton Feb 3 '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:

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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.

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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.

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