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Nigle280351181r7p
Participant
January 20, 2023
Answered

liquid in bottle keeps filliing to brim in render preview

  • January 20, 2023
  • 3 replies
  • 388 views

This is how it looks like before render:

After render:

 

Is this a bug?

 

This topic has been closed for replies.
Correct answer JMathews

Hello!  This is not a bug.  The real time rendering is an approximation.  It is designed to be fast, but it is not 100% accurate.  It is very important to use raytracing to preview and finalize your material settings so that it gets the look you want.

 

What's happening here is refraction.  The translucent bottle is refracting the liquid inside, which distorts the graphic.  Usually you can adjust the IOR of the glass and liquid to get less distortion.

 

First, be sure to enable the render preview:

 

 

Second, select the glass object, select the glass material and adjust the IOR.  Index of refraction is a scientific measurement of how much a translucent material distorts light as it passes through.  A lower IOR is like a air, or a pane of glass.  It has very low distortion.  A higher IOR will have a higher distortion.

 

 

 

3 replies

JMathews
Community Manager
JMathewsCommunity ManagerCorrect answer
Community Manager
January 20, 2023

Hello!  This is not a bug.  The real time rendering is an approximation.  It is designed to be fast, but it is not 100% accurate.  It is very important to use raytracing to preview and finalize your material settings so that it gets the look you want.

 

What's happening here is refraction.  The translucent bottle is refracting the liquid inside, which distorts the graphic.  Usually you can adjust the IOR of the glass and liquid to get less distortion.

 

First, be sure to enable the render preview:

 

 

Second, select the glass object, select the glass material and adjust the IOR.  Index of refraction is a scientific measurement of how much a translucent material distorts light as it passes through.  A lower IOR is like a air, or a pane of glass.  It has very low distortion.  A higher IOR will have a higher distortion.

 

 

 

Adobe Principal Product Manager, 3D & Immersive
    Imaginerie
    Community Expert
    ImaginerieCommunity Expert
    Community Expert
    January 20, 2023

    I called it colour spill, and you call it with the right term 🙂 Refraction...
    It's best when the experts chime in!

    Ares Hovhannesyan
    Community Expert
    Ares HovhannesyanCommunity Expert
    Community Expert
    January 20, 2023

    Usually I get correct render with filled bottles. Can you share file via cloud to test? 

    Thx

    Imaginerie
    Community Expert
    ImaginerieCommunity Expert
    Community Expert
    January 20, 2023

    Hello!

    It shouldn't be, but you might check if it isn't actually a colour spill (from the liquid) into the glass surface. To check that, change the opacity of the liquid  to - say - 50%, and/or change to colour to a lighter one. If that's the case, you should see a clear demarcation between the liquid and the void on top of it. It wouldn't appear in the non-rendered version, because not all lighting and shadows appear correctly in the 1st version. This may be far-fetched, but worth a try.

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