title: Glass is opaque, won't show fluid inside (blender 2.83)
body: <p>I simply want to be able to see things inside my glass tube including fluid. A little like <a href="https://www.youtube.com/watch?v=IhvCaTqfL64&amp;t=477s" rel="nofollow noreferrer">this video</a>.
  Currently, the glass is reflective yet opaque, like a mirror. <a href="https://i.stack.imgur.com/SFxLi.png" rel="nofollow noreferrer">This is the tube in wireframe</a>, you can clearly see the liquid and inflow object inside. However, <a href="https://i.stack.imgur.com/X1056.jpg" rel="nofollow noreferrer">rendered</a>, they are both hidden. You can see I used the glass BSDF shader.
  I seem to also be having issues getting my liquid to be a mesh instead of rainbow dots but I think that's a separate problem and doesn't explain why my glass is opaque?
  Thanks in advance,
  Yosef</p>