After following Andrew Prices' tutorial for coffee and a doughnut to the coffee part, I find that my cup seems to be frosted glass in the render while looking transparent in non-rendered views.

Is this caused by reflections in the environment, or have I got the material wrong somehow? Any help would be appreciated.enter image description here

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    $\begingroup$ Welcome! I think that's fine, you just need to up the samples for the viewport (Preview): blender.stackexchange.com/questions/47137/… and wait a bit longer :) After a few minutes it will resolve into a transparent cup. $\endgroup$ – brockmann Feb 13 at 19:27
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    $\begingroup$ Figured it out, I had the light positioned almost overhead making odd reflections in the cup. Re-positioned light = no more frosted glass. =) $\endgroup$ – OKH Feb 13 at 19:45
  • $\begingroup$ Makes no sense to me, but if so please write an answer and accept it for people having the same issue @OKH $\endgroup$ – brockmann Feb 13 at 19:46

Get glass material from: http://blendermada.com/materials/?engine=cyc&category=glass&keyword= Is it Cycles or Eevee? Refractions and reflections in Eevee are not so great. Use Cycles if is a still photo.

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    $\begingroup$ Why we should use this material? Any advantage compared to the principled shader? $\endgroup$ – brockmann Feb 13 at 19:36
  • $\begingroup$ It was Cycles, but I think I fixed the problem. Thanks for the response! $\endgroup$ – OKH Feb 13 at 19:46

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