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I am new here and in Blender... I have a problem with my work. I made a Glass bottle with a message inside and placed it under water. I want to get something like a bottle in the ocean. The problem is, my bottle doesn't show when I'm doing a preview. I have a cube with principled volume. When I delete the cube, I have my bottle back. The issue is with the cube or with the bottle, but I don't know how to fix it.

enter image description here

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  • $\begingroup$ Hello could you please share your file? $\endgroup$
    – moonboots
    May 17, 2023 at 10:55
  • $\begingroup$ Keep in mind water has IOR of 1.33 and glass IOR is around 1.52. That is when the interface is between air and the material. So if light goes from water to glass, IOR will be 1.52/1.33=1.14... If the bottle has some liquid and air in it it will get even more fun. $\endgroup$ May 17, 2023 at 11:06
  • $\begingroup$ I don't think your bottle is not showing under water. It is simply surrounded and penetrated by a homogenous featureless volume which is reflected on the surface of the glass - so it is not really showing anything because all it can reflect is the blueish uniform volume. How did you light the scene how dense is the volume? Is there anything shining on the bottle which should show up in the reflections? How does it look without the volumetrics? $\endgroup$ May 17, 2023 at 12:02
  • $\begingroup$ @moonboots here are my files: drive.google.com/drive/folders/… $\endgroup$ May 17, 2023 at 17:16
  • $\begingroup$ @MartynasŽiemys So the IOR would be a reason? I' ve changed IOR of a cube and started see my bottle but all scenery was to bright $\endgroup$ May 17, 2023 at 17:19

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Here your main problem is that the Density of the Principled Volume is too high, lower it down, otherwise you won't be able to see the bottle.

For a deep ocean there are probably several things that you need to do, but first maybe try this setup: Plug a Noise Texture (set to 2D) into a ColorRamp into the Color input of the Principled Volume (you could instead plug a b&w ColorRamp into the Density), tilt a bit the noise in the Mapping node:

enter image description here

enter image description here

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  • $\begingroup$ Ok, so I had a little bit fun with blender today and fixed my project. I followed your steps. Everything looks good right now. I have changed a little bit IOR too. Thank you all for a help. I appreciate that! I see great community here. Hope will be easier in the future. $\endgroup$ May 18, 2023 at 17:24
  • $\begingroup$ Great then ;) ....... $\endgroup$
    – moonboots
    May 18, 2023 at 17:28

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